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ASANO HitoshiGraduate School of Engineering / Department of Mechanical EngineeringProfessor
Researcher basic information
■ Research Keyword■ Research Areas
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering / Gas-liquid two-phase flow
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Thermal engineering / Heat transfer
- Apr. 2023 - Present, 日本伝熱学会, 関西支部長
- Apr. 2023 - Present, 日本機械学会, 理事
- Jul. 2021 - Present, IEA（国際エネルギー協会）, Annex 58 国内分科会 委員長
- Apr. 2017 - Present, Japan Society of Refrigeration and Air-Conditioning Engineers, Chair of the technical committee for heat exchangers
- Jan. 2017 - Present, International Centre for Heat and Mass Transfer, Scientific Council
- Jan. 2014 - Present, The Japan Society of Mechanical Engineers, Mechanical Engineering Journal, Editor in Chief
- Apr. 2022 - Mar. 2023, 日本機械学会, 動力エネルギーシステム部門，部門長
Research activity information
■ Award- Sep. 2018 Japan Society of Refrigeration and Air-Conditioning Engineers, The Society of Air-conditioning and Refrigerating Engineers of Korea, Chinese Association of Refrigeration, Asian Academic Award, Contribution to the understanding of thermo-fluid dynamics in compact heat exchangers
- Jun. 2010 社団法人日本ガス協会, 日本ガス協会 論文賞, 隣組コージェネレーションに関する研究
- Mar. 2009 日本機械学会関西支部, 日本機械学会 関西支部賞（研究賞）, 熱連係を用いた分散型エネルギー供給システム（隣組コージェネ）の向けた研究
- Apr. 2006 日本機械学会, JSME Medal for Outstanding Paper, プレート熱交換器内気液二相流の流動特性に関する研究(単一流路内の流動挙動の可視化及びボイド率分布の計測)，日本機械学会論文集，70巻，700号，Ｂ編 （2004年12月）
- Sep. 2002 日本機械学会, 日本機械学会熱工学部門講演論文表彰, 第６回ASME-JSME 熱工学会議での講演発表
- Last, Elsevier BV, Feb. 2023, Applied Thermal Engineering, 220, 119697, English[Refereed]Scientific journal
- Elsevier BV, Dec. 2022, International Journal of Heat and Mass Transfer, 198, 123423, English[Refereed]Scientific journal
- This paper reports the selective fabrication of a zeolitic imidazolate framework-8 (ZIF-8) cover layer over the outer surface of silica hard-shell microcapsules (HSMC) to improve the microencapsulation technique of phase change materials for heat storage materials. ZIF-8 was formed not only over the HSMC but also in the synthesis solution side when using a conventional batch operation owing to the rapid formation rate of ZIF-8 in the aqueous solution at 293 K. In this study, a semi-batch operation, which can control the concentration of the components in the synthesis solution by gradually dropping the components, was employed to decrease the formation rate of ZIF-8. X-ray diffraction results suggested that dropping ingredients strongly affected the obtained products; the addition of the Zn2+ aqueous solution into a 2-methylimidazole (Hmim) aqueous solution was suitable for the formation of ZIF-8, whereas the addition of an aqueous solution of Hmim into the Zn2+ aqueous solution formed Zn hydroxides as unfavorable by-products. Field-emission scanning electron microscopy and energy-dispersive X-ray spectroscopy results confirmed that the semi-batch operation with the addition of Zn2+ into the Hmim aqueous solution selectively formed a ZIF-8 cover layer over the HSMC. We conclude that the semi-batch operation is an effective procedure for suppressing the unfavorable homogeneous nucleation on the solution side and making heterogeneous nucleation dominant without any additives to fabricate the ZIF-8 cover layer.Sep. 2022, CrystEngComm, 24(42) (42), 7378 - 7386, English[Refereed]Scientific journal
- Apr. 2022, Proc. of the 10th Asian Conf. on Refrigeration and Air-Conditioning, 144, EnglishStudy on Void Fraction Characteristics of Gas-Liquid Two-Phase Flows in Horizontal Non-Circular Small Diameter Channel[Refereed]International conference proceedings
- Mar. 2022, Japanese Journal of Multiphase Flow, 36(1) (1), 47 - 54, JapaneseStudy on Void Fraction Characteristics of Gas-Liquid Two-Phase Flows in Horizontal Non-Circular Small Diameter Channel[Refereed]Scientific journal
- Last, Elsevier BV, Mar. 2022, Applied Thermal Engineering, 204, 117963, English[Refereed]Scientific journal
- Japan Society of Mechanical Engineers, 2022, Mechanical Engineering Journal, 9(4) (4), 22-00069, English[Refereed]Scientific journal
- Corresponding, Oct. 2021, Proc. 2nd Asian Conference on Thermal Sciences, 40812, EnglishEffects of surface wettability on heat transfer characteristics of falling film evaporation of HFO1233zd(E)[Refereed]International conference proceedings
- Japan Society of Mechanical Engineers, Oct. 2021, Proc. of International Conference on Power Engineering-2021, 9(4) (4), ICOPE-2021-0285 - 00069, English[Refereed]International conference proceedings
- Oct. 2021, Proc. of International Conference on Power Engineering-2021, ICOPE-2021-0219, EnglishEffects of water accumulation in the proton exchange membrane and the gas diffusion layer on the power generation performance of PEFC[Refereed]International conference proceedings
- Corresponding, Oct. 2021, Proc. of International Conference on Power Engineering-2021, ICOPE-2021-0156, EnglishStudy on the effect of tube gap on nucleate boiling heat transfer coefficient in horizontal tube bundle[Refereed]International conference proceedings
- Springer Science and Business Media LLC, Oct. 2021, Microgravity Science and Technology, 33(5) (5), 57, English[Refereed]Scientific journal
- Corresponding, Elsevier BV, Sep. 2021, Applied Thermal Engineering, 196, 117329, English[Refereed]Scientific journal
- Elsevier BV, Aug. 2021, Flow Measurement and Instrumentation, 80, 101997 - 101997Scientific journal
- Last, Elsevier BV, Jul. 2021, Applied Thermal Engineering, 194, 117096, English[Refereed]Scientific journal
- Jun. 2021, Proc. 2nd IIR International Conference on HFO Refrigerants and Blends, 281, EnglishFalling film evaporation and pool boiling of HFO1233zd(E) on a low finned tube with thermal spray coating[Refereed]International conference proceedings
- Corresponding, Jun. 2021, Proc. 2nd IIR International Conference on HFO Refrigerants and Blends, 288, EnglishEffect of refrigerant properties on pool boiling heat transfer enhancement by thermal spray coating[Refereed]International conference proceedings
- May 2021, Proc. 18th International Refrigeration and Air Conditioning Conference at Purdue, 2114, EnglishHeat Transfer Enhancement of Falling Film Evaporation of HFO-1233zd(E) and HFC-134a on a Horizontal Tube by Thermal Spray Coating[Refereed]International conference proceedings
- Springer Science and Business Media LLC, Apr. 2021, Microgravity Science and Technology, 33(2) (2), 28, English[Refereed]Scientific journal
- This chapter describes the academic knowledge needed in the design and operation of power plants. In both thermal and nuclear power plants, thermal energy is transferred to mechanical energy. Efficiency to convert the thermal energy to the mechanical energy is hence very important in power plants. Basic laws of energy conversion are discussed in Section 3.1: Thermodynamics. In the power plants, the heat is transferred to working fluid such as water, helium, and liquid sodium. After receiving the heat, the working fluid is conveyed to turbine to generate electricity. The fluid flow and heat transfer are hence important fundamental processes encountered in the power plants. These are discussed in Section 3.2: Fluid Dynamics and Section 3.3: Heat Transfer, respectively. The academic knowledge discussed in Sections 3.1-3.3 is commonly important in the thermal and nuclear power plants. The most essential difference between the thermal and nuclear power plants is the heat generation method. The heat is generated by fuel combustion in the thermal power plants and by nuclear reaction in the nuclear power plants. The basic principles of combustion and nuclear reaction are discussed in Section 3.4: Combustion and Section 3.5: Nuclear Physics, respectively.Jan. 2021, Fundamentals of Thermal and Nuclear Power Generation, 77 - 226In book
- 日本冷凍空調学会, 2021, Trans. of the Japan Society of Refrigerating and Air Conditioning Engineers, 38(2) (2), 133 - 143, JapaneseFalling Film Evaporation Heat Transfer of R134a and R1233zd(E) on a Horizontal Low Finned Tube with Thermal Spray Coating[Refereed]
- Corresponding, 2021, Trans. of the Japan Society of Refrigerating and Air Conditioning Engineers, 38(2) (2), 73 - 83, JapaneseCondensing Heat Transfer and Flow Characteristics in Horizontal Mini Triangular Channel[Refereed]
- The influence of surfactant concentration on the sedimentation characteristics of silica hard-shell microcapsules containing trimethylolethane clathrate hydrates as phase change materials was studied. A combination additive of a cationic surfactant system and polyvinyl alcohol (PVA) was employed to inhibit sedimentation. The surfactants concentration was varied between 0 and 6000 ppm, while PVA was constant at 2000 ppm. The apparent shear viscosities and the apparent volume fractions of the sedimentation were measured. In each solution, the hydraulic diameter of the molecular structure in each solution was determined. Sedimentation experiments revealed that the sedimentation was effectively reduced when the surfactant concentration was greater than 4000 ppm. The extensional viscosity of the fluid dominated the sedimentation characteristics of the systems with high concentrations. Meanwhile, the sedimentation velocity was observed to be comparatively high for a surfactant concentration of 2000 ppm. In the considered cases, surfactant molecules adsorbed on the surface of the microcapsules, leading to the disappearance of high-order structure of the combination additives, increasing counter-ion molar ratio, while the decreasing the extensional viscosity. A surfactant concentration of 4000 ppm was found to be optimal among the present conditions considered.Society of Chemical Engineers, Japan, Aug. 2020, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 53(8) (8), 431 - 437[Refereed]Scientific journal
- Falling film evaporators are gaining popularity as substitutes to typical flooded evaporators because of their low refrigerant charge. It is important to form and keep a thin liquid film on the heat transfer surface to ensure their high heat transfer performance. In this study, as a heat transfer enhancement surface, a fine porous surface processed using thermal spray coating was applied to a smooth copper tube with an outer diameter of 19.05 mm. Heat transfer coefficients of falling film evaporation on a single horizontal tube were experimentally evaluated using the HFC-134a refrigerant. The experiments were performed at a saturation temperature of 20 °C with the heat flux ranging from 10 to 85 kW·m−2 and for film Reynolds numbers up to 673. The study aimed to clarify the effect of the coating on the heat transfer characteristics of falling film evaporation. The results revealed that the coating could suppress partial dry out and enhance nucleate boiling in the falling film. The maximum heat transfer enhancement factor was 5.2 in the experimental range. It was further noted that the effect of the coating was especially strong under a low heat flux condition.Corresponding, MDPI AG, Feb. 2020, Applied Sciences, 10(5) (5), 1632 - 1632, English[Refereed]Scientific journal
- Boiling two-phase flows in cross-flow type mini-channel evaporator were visualized by neutron radiography. Refrigerant vertically upward flow of HFC134a [CH2FCF3] in 21 parallel channels with the hydraulic diameter of 1.47 mm was heated by the heating medium of fluorocarbon FC3283. Void fraction distributions of evaporating two-phase flows were measured by neutron radiography. The effect of the inlet orifices for each refrigerant channel to prevent flow instability was evaluated. The refrigerant was supplied to the test section as subcooled liquid with the mass flux of 50 to 100 kg/(m2s). The heating medium was supplied with the mass flux of 460 and 920 kg/(m2s) and at the inlet temperature of 47.1 to 67.2 °C. As the result, it is shown that void fraction close to the inlet of heating medium was relatively higher. Flow instability of boiling flows and the effect of the inlet orifices were not observed.Materials Research Forum LLC, Feb. 2020, Materials Research Proceedings, 15, 274 - 280, English[Refereed]Scientific journal
- In this study, neutron radiography and electrochemical impedance spectroscopy (EIS) were simultaneously used to evaluate the relation between the water amount and the electro chemical characteristics in a polymer electrolyte fuel cell (PEFC). Two-dimensional water distributions in the through-plane direction of the proton exchange membrane (PEM) were measured every 60 s during the PEFC operation. The results were compared with ionic and the polarization resistances obtained from EIS. The ionic conductivity through the PEM increased with an increase in the liquid-water content in the membrane. The effects of water content on the ionic conductivity were much smaller in comparison to the Springer’s model at a water content was less than 1. The polarization resistance increased with an increasing in liquid-water accumulation in the gas diffusion layer.Materials Research Forum LLC, Feb. 2020, Materials Research Proceedings, 15, 268 - 273, English[Refereed]Scientific journal
- Japan Society of Mechanical Engineers, 2020, Mechanical Engineering Journal, 7(4) (4), 20-00131 - 00131, English[Refereed]Scientific journal
- 2020, Experimental Thermal and Fluid Science, 112, 109957, English[Refereed]Scientific journal
- Nov. 2019, Proc. of The 30th International Symposium on Transport Phenomena (ISTP30), #ISTP151, EnglishCharacteristics of Flow Boiling In Transparent Glass Heating Tube under Microgravity onboard ISS[Refereed]International conference proceedings
- Corresponding, Nov. 2019, Proc. of The 30th International Symposium on Transport Phenomena (ISTP30), #ISTP049, EnglishGas-Liquid Interfacial Structure Observed in Boiling Two-Phase Flow Experiment under Microgravity in International Space Station[Refereed]International conference proceedings
- Corresponding, Nov. 2019, Proc. of The 30th International Symposium on Transport Phenomena (ISTP30), #ISTP024, EnglishEffect of Partially Inserted Boiling Heat Transfer Enhanced Tube on Nucleate Boiling Heat Transfer in Horizontal Tube Bank[Refereed]International conference proceedings
- Oct. 2019, Proc. of International Conference on Power Engineering-2019, 1081 - 1084, EnglishEffect of incident angle on ultrasonic transmission in steam flow for use with clamp-on ultrasonic flowmeter[Refereed]International conference proceedings
- Corresponding, Oct. 2019, Proc. of International Conference on Power Engineering-2019, 767 - 772, EnglishBoiling heat transfer characteristics in horizontal in-line tube bundle with partially inserted heat transfer enhanced tube by thermal spray coating[Refereed]International conference proceedings
- The sedimentation and flow characteristics of micro-encapsulated phase change materials have been investigated. As a phase change material, trimethylolethane clathrate hydrate having 218 kJ kg(-1) of latent heat was used and encapsulated in silica hard-shell microcapsules, which size distribution has two peak at 15 mu m and 59 mu m. A cationic surfactant, oleylbishydroxyethylmethylammonium chloride with a counter-ion, sodium salicylate was used as drag reducing additives and poly vinyl alcohol was used as a stabilizer. From the results, it was found that the combination additive prevents effectively the microcapsule sedimentation. The drag reduction was also observed to occur in the high Reynolds number region. Thus, the present additive was concluded to be promising for the latent heat transportation by use of silica hard-shell microcapsules containing phase change materials. (C) 2019 Elsevier Ltd and IIR. All rights reserved.Elsevier BV, Oct. 2019, International Journal of Refrigeration, 106, 18 - 23, English[Refereed]Scientific journal
- Effects of water distribution on the electrical characteristics of polymer electrolyte fuel cell© ICOPE 2019 - 7th International Conference on Power Engineering, Proceedings. All rights reserved. Water management in a polymer electrolyte fuel cell (PEFC) is a key topic for PEFC operation. It is well known that the water accumulation in the gas diffusion layer (GDL) increases the polarization resistance, whereas the increases of the water content, λ, in the proton exchange membrane (PEM) decreases the proton conductivity. In this study, neutron radiography and the electrochemical impedance spectroscopy (EIS) were employed simultaneously for evaluating the relation between the water contents and the polarization losses in a PEFC. Water accumulation started in the GDL, and a large amount of water existed in the GDL under the lands. The water-accumulation area extended to the GDL under the channels during the PEFC operation. Water accumulation in the channel disturbed the air supply resulting in the rapid increase of the polarization resistance. Ion conductivity of the membrane increased in proportion to the water content. However, the effect of the water contents on the ion conductivity was less at low λ than a correlation proposed by Springer et al. for λ > 1.Oct. 2019, Proc. of International Conference on Power Engineering-2019, 829 - 832, English[Refereed]International conference proceedings
- Corresponding, Aug. 2019, Proc. of The 25th IIR International Congress of Refrigeration, #907, EnglishHeat Transfer and Flow Characteristics of Condensing Flow in a Quadrilobed Tube[Refereed]International conference proceedings
- Aug. 2019, Proc. of The 25th IIR International Congress of Refrigeration, #1095, EnglishVoid fraction characteristics of adiabatic one-component vertically upward two-phase flows in circular and non-circular small diameter tubes[Refereed]International conference proceedings
- Corresponding, Mar. 2019, Proc. of the 6th International Conference of Saving Energy in Refrigeration and Air-Conditioning, ICSERA2019-006, EnglishHeat transfer enhancement of falling film evaporation on a horizontal tube by thermal spraying[Refereed]International conference proceedings
- Jan. 2019, KURNS-EKR (Web), (3) (3), 55‐59 (WEB ONLY), Japanese中性子イメージングの高度化
- Nov. 2018, 12th Asian Microgravity Symposium - 2018, EnglishBrief Report of Two-phase Flow Experiment on-board ISS[Refereed]International conference proceedings
- Oct. 2018, Proceedings of The 29th International Symposium on Transport Phenomena (ISTP29), ISTP29 - 088, EnglishFabrication of Hard-Shell Microcapsules Containing Sodium Acetate Inorganix Hydrates[Refereed]International conference proceedings
- Sep. 2018, 11th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, EnglishDevelopment of a hybrid ultrasonic flow meter with the use of pulsed Doppler and time-of-flight[Refereed]International conference proceedings
- © 2018 Elsevier B.V. This study investigated the local characteristics of void-fraction distribution and heat transfer around tubes in two-phase flows under adiabatic conditions using vertical duct test sections with inner dimensions of 90 × 90 mm2. Two kinds of test sections, in-line and staggered tube bundles, each containing five columns and eight rows, were employed for the measurements. The tube diameter of each was 15 mm, and the pitch-to-diameter ratio was 1.5 for both bundles. The working fluids were air and water, and the experiments were performed under atmospheric pressure in a temperature range of 20–25 °C. Superficial liquid velocity, JL, and gas velocity, JG, ranged from 0.1 to 0.3 m/s and 0.03 to 1.19 m/s, respectively. Two-dimensional void-fraction distributions were obtained using X-ray radiography and the local heat-transfer coefficients were measured using a platinum wire electrode placed on a tube that could be rotated. In the experiments, the time-averaged void fraction increased at the maximum and vertical minimum gaps for the in-line tube bundle, whereas the void fraction increased upstream of the tubes for the staggered tube bundle. In the bubbly flow condition, enhancement of the heat transfer by bubbles motion clearly occurred between ±90 and 180° for the in-line tube bundle, and increased all over the pipe for the staggered tube bundle. The increase in the local heat transfer coefficients by bubbles motion was more apparent for the in-line tube bundle. The average heat transfer coefficient in the staggered tube bundle was higher than that in the in-line tube bundle in the bubbly flow regime, whereas the results were opposite in the intermittent flow regime.Aug. 2018, Nuclear Engineering and Design, 334, 66 - 74, English[Refereed]Scientific journal
- Corresponding, Begellhouse, Aug. 2018, International Heat Transfer Conference 16, 1349 - 1356, English[Refereed]International conference proceedings
- © 2018 International Heat Transfer Conference. All rights reserved. In order to increase the void fraction in silica hard-shell microcapsules containing phase change materials, the effects of the reaction time for generating the silica shell have been investigated. The reaction time in the W/O/W double emulsion method for silica hard-shell microcapsule fabrication was changed from 10 to 120 min. The size and the shell thickness of hollow microcapsules were measured by a laser diffraction particle size analyzer and by an image processing method on SEM images, respectively. The void fraction was also confirmed by differential scanning calorimeter (DSC) measurements. As phase change materials, disodium hydrogen phosphate-12 water hydrate whose phase change temperature is 32oC and latent heat is 264kJ/kg was applied in this study. From this, it was found that the shell thickness increase with the reaction time, while the microcapsule size was constant after 30 min. The maximum void fraction was obtained when the reaction time was set at 10 min. It was 73.8vol%, which is larger than the results reported in the previous study. It was also confirmed by the latent heat measurements. Thus, it was concluded that the void fraction could be improved by the tuning of the reaction time.Begellhouse, Aug. 2018, International Heat Transfer Conference 16, 2018-August, 4319 - 4325[Refereed]International conference proceedings
- Jul. 2018, 2018 Purdue Conference - 17th Refrigeration and Air Conditioning, EnglishEffect of flow direction of heating medium on boiling heat transfer characteristics in a single-channel plate-fin heat exchanger[Refereed]International conference proceedings
- In transit-time ultrasonic flow meters (TOF), the flow rate is derived from the transit time of an ultrasonic pulse between two ultrasonic transducers. To convert the transit time into flow rate, a profile factor (PF) is required. Because the PF strongly depends on the velocity profile, a precise calibration of the PF is essential to the accuracy of the TOF. Hence, a field calibration, referred to as on-site calibration, is desirable. In this study, a hybrid ultrasonic flow meter that helps calibrate the TOF using ultrasonic Doppler velocimetry (UDV) is proposed for on-site calibration by integrating the velocity profiles over the cross-sectional area of a pipe. Thus, a new system of hybrid ultrasonic flow meter was developed. The maximum flow rate measured using a conventional UDV is significantly lower than that measured using the TOF. Therefore, a system was developed to measure higher velocities and flow rates. The system is novel in that the transit time and velocity profile can be simultaneously measured using a de-aliasing method. To evaluate the influence of the velocity profile on the PF, experiments were conducted under a wide range of flow-rate conditions, which otherwise cannot be implemented using the conventional UDV. To evaluate the influence of the velocity profile in the pipe, an obstacle plate was placed at 8D upstream the test section. Radially arranged measuring lines were employed. The experimental results show that increasing the number of measuring lines did not improve the accuracy of the TOF. On the other hand, the flow rate could be accurately obtained using the proposed UDV by measuring the velocity profile even under distorted flow conditions. Furthermore, the calibration of the PF based on the flow rate obtained using the proposed UDV was found to be feasible.Elsevier Inc., Jun. 2018, Experimental Thermal and Fluid Science, 94, 49 - 58, English[Refereed]Scientific journal
- Jun. 2018, The 9th Asian Conference on Refrigeration and Air Conditioning (ACRA2018), EnglishEffect of flow direction of heating medium and fin pitch on evaporative heat transfer in single-channel plate-fin heat exchanger[Refereed]International conference proceedings
- Corresponding, Apr. 2018, 9th European-Japanese Two-Phase Flow Group Meeting, EnglishIntroduction of boiling two-phase flow experiment onboard International Space Station[Refereed]International conference proceedings
- Apr. 2018, 9th European-Japanese Two-Phase Flow Group Meeting, EnglishTwo-phase flow and heat transfer characteristics in horizontal tube bundles[Refereed]International conference proceedings
- Mar. 2018, 10th International Conference on Boiling and Condensation Heat Transfer, EnglishPool boiling heat transfer around a horizontal low thermal conductivity tube under isothermal wall condition[Refereed]International conference proceedings
- Mar. 2018, 10th International Conference on Boiling and Condensation Heat Transfer, EnglishCondensing Heat Transfer Characteristics of HFC-134a in a Quadrilobed Tube[Refereed]International conference proceedings
- Japan Society of Mechanical Engineers, 2018, The Proceedings of the National Symposium on Power and Energy Systems, 2018.23(0) (0), D212 - D212Scientific journal
- Boiling Two-Phase Flow experiment in microgravity onboard International Space stationCopyright © 2018 by the International Astronautical Federation (IAF). All rights reserved. A series of systematic experiments was performed using a boiling and two-phase flow loop under the microgravity condition provided by the International Space Station. Based on the understanding of gas-liquid interfacial behaviour and highly reliable data on heat transfer characteristics from this experiment, we clarify the details of elementary processes concerning boiling two-phase flow under the microgravity condition. This experiment also demonstrates a boiling cooling system in space. Through this experiment, we acquired data useful for designing a high-performance and compact thermal control system, aiming to develop it into an innovative space platform. The microgravity experiment was performed from July 2017 to March 2018. The experimental facility worked well, and a lot of data were able to accumulate. Under the certain regime of experimental condition, it was completely different from the behaviour of boiling bubbles on the ground. As a result, heat transfer also showed unique characteristics.2018, Proceedings of the International Astronautical Congress, IAC, 2018-October, English[Refereed]International conference proceedings
- To investigate the sedimentation and flow characteristics of hard-shell microcapsule/water slurries, the apparent viscosity, apparent dispersion volume fractions, and friction characteristics were measured. The hard-shell microcapsule contains disodium hydrogen phosphate hydrate as a phase change material. Poly (vinyl alcohol) (PVA) with a concentration from 0 to 2,000 ppm was applied as a dispersant. A drag-reducing surfactant system was also added to the slurries to improve the flow characteristics of the slurries. As a drag-reducing surfactant, oleylbishydroxyethylmethylammonium chloride was added at 2,000 ppm with a counter-ion of sodium salicylate. As a trial, the concentration of microcapsules was set at a low value at 1 or 2 wt%. From the results, severe adsorption of surfactants onto the hard-shell microcapsules was found. Then, no drag reduction or sedimentation prevention occurred in the cases without PVA. However, there is a weak sedimentation prevention effect and effective drag reduction effect when PVA is present. Thus, it is concluded that the desorption of surfactants from the microcapsules occurs and forms a synergetic structure with the PVA.International Institute of Refrigeration, 2018, Refrigeration Science and Technology, 2018-, 174 - 181, English[Refereed]International conference proceedings
- 日本冷凍空調学会, Dec. 2017, Trans. of the Japan Society of Refrigerating and Air Conditioning Engineers, 34(4) (4), A354 - 1-6, Japanese単流路プレートフィン熱交換器内垂直上昇沸騰熱伝達に及ぼす加熱媒体流動方向の影響[Refereed]Scientific journal
- Dec. 2017, 10th International Symposium on Measurement Techniques for Multiphase Flow, EnglishDevelopment of an ultrasonic technique for measuring liquid-metal two-phase flow[Refereed]International conference proceedings
- Oct. 2017, The Ninth JSME-KSME Thermal and Fluids Engineering Conference, EnglishPool Boiling Heat Transfer around a Horizontal Low Thermal Conductivity Tube with Thermal Spray Coating with Isothermal Heating[Refereed]International conference proceedings
- Oct. 2017, The Ninth JSME-KSME Thermal and Fluids Engineering Conference, EnglishDevelopment of an ultrasonic technique for measuring phase velocities in liquid-metal two-phase flow[Refereed]International conference proceedings
- Sep. 2017, The 12th Int. Conference on Two-Phase Systems for Ground and Space Applications, EnglishStudy on the Effect of Channel Cross-Sectional Shape on Void Fraction Characteristics of One-Component Vertically Upward Two-Phase Flows[Refereed]International conference proceedings
- This chapter deals with the various topics on boiling with regard to aspects of the fundamentals and applications to introduce the development of each author's research in recent decades. The first four sections investigate the physics of boiling as phase change phenomena, including thermodynamic phase equilibrium state (Section 6.1), molecular dynamics of phase change (Section 6.2), computational analysis of boiling in micro-nano scale (Section 6.3), and transient boiling under rapid heating (Section 6.4). Section 6.5 deals with two-phase distribution measurement using neuron radiography. The following three sections then examine a specific boiling regime during highly subcooled boiling, called microbubble emission boiling (MEB). Each section treats the overall characteristics of MEB (Section 6.6), the occurrence conditions of MEB (Section 6.7), and vapor collapses in subcooled liquid related to MEB (Section 6.8). The next four sections are devoted to heat transfer augmentation with various techniques: thermal spray coating (Section 6.9), porous media (Section 6.10), patterned wettability refinement (Section 6.11), and self-rewetting fluid (Section 6.12). The last seven sections describe topics on applications of boiling. Sections 6.13 and 6.14 introduce boiling research in steel industries. Sections 6.15 and 6.16 explore vapor explosion. Boiling of refrigerant is discussed with heat pump systems in Section 6.17 and with automobile air conditioners in Section 6.18. Boiling related to emergency cooling core systems is considered in Section 6.19.Jun. 2017, Boiling: Research and Advances, 443 - 777In book
- Jun. 2017, The 2nd Int. Conf. of Interfacial Phenomena and Heat Transfer, EnglishVoid Fraction Characteristics of Gas-Liquid Two-Phase Flows in Small Diameter Square Tube[Refereed]International conference proceedings
- 日本冷凍空調学会, Mar. 2017, Trans. of the Japan Society of Refrigerating and Air Conditioning Engineers, 34(1) (1), 13 - 24, Japaneseオフセットフィンを内蔵したプレートフィン熱交換器内気液二相流の流動特性に関する研究[Refereed]Scientific journal
- Mar. 2017, Proc. of 1st Asian Conf. on Thermal Sciences, EnglishEffect of Refrigerant Oil on Critical Flow Rate Characteristics of CO2 through an Orifice[Refereed]International conference proceedings
- Japan Society of Mechanical Engineers, 2017, The Proceedings of the National Symposium on Power and Energy Systems, 2017.22(0) (0), F114 - F114Scientific journal
- TWO-PHASE FLOW BEHAVIOR AND HEAT TRANSFER CHARACTERISTICS IN KETTLE REBOILEREffects of the tube array, such as in-line and staggered, on void-fraction distribution and heat transfer coefficient around a tube were experimentally investigated. The test section was vertical duct with inner size of 90 x 90 mm(2). Diameter of the tubes was 15 mm, and the pitch-to-diameter ratio was 1.5 for both tube bundles. Working fluids were air and water. Experiments were carried out at superficial gas velocity defined at minimum area section, J(G), of 0.10 to 0.89 m/s, superficial liquid velocity, J(L), of 0.1 to 0.3 m/s, under the atmospheric condition. Measurements of void-fraction distribution were carried out using X-ray radiography. In addition, heat transfer coefficient around a tube was measured and the heat transfer coefficients in association with the flow regime and the void fraction distribution were evaluated. Time-average void-fraction was higher around upstream of a tube than that of downstream at bubbly flow condition for both bundles. Under intermittent flow condition, time-average void fraction at the maximum gap were higher than that around the other points in both tube bundles. For in-line tube bundle, enhancement of the heat transfer clearly appeared between +/- 90 to 180 degrees. For staggered tube bundle, the heat transfer increased all over the pipe.AMER SOC MECHANICAL ENGINEERS, 2017, PROCEEDINGS OF THE ASME POWER CONFERENCE JOINT WITH ICOPE-17, 2017, VOL 1, English[Refereed]International conference proceedings
- EFFECT OF FLOW DIRECTION OF HEATING MEDIUM ON HEAT TRANSFER PERFORMANCE OF SINGLE-PATH PLATE-FIN EVAPORATOREffect of flow direction of heating medium on the heat transfer performance of upward evaporating refrigerant flows in a plate-fin heat exchanger was examined using HFC-134a as the refrigerant. The heat exchanger had a single refrigerant channel sandwiched by two water channels. Hot water flew upward or downward to form a parallel or counter flow heat exchange, respectively. To understand the heat flux distribution, temperature distributions on the outside wall of the water channel were visualized by an IR camera. As the results, it was shown that the difference in heat transfer rate between the parallel and counter flow was a little due to the large temperature difference in the heat exchange. The pressure loss of the refrigerant flow was larger for the parallel flow than the counter flow. It could be estimated from the wall temperature distribution that the increase in pressure loss might be caused by inhomogeneous phase distribution of the refrigerant flow.AMER SOC MECHANICAL ENGINEERS, 2017, PROCEEDINGS OF THE ASME POWER CONFERENCE JOINT WITH ICOPE-17, 2017, VOL 1, English[Refereed]International conference proceedings
- Nov. 2016, Proc. of 4th International Forum on Heat Transfer, EnglishVoid fraction characteristics of gas-liquid two-phase floes in small diameter square tube[Refereed]International conference proceedings
- Oct. 2016, Proc. of 11th Asian Microgravity Symposium, EnglishResults of Performance Test of a Glass Heated Section Installed in the Ore-Flight Model on Board ISS[Refereed]International conference proceedings
- Oct. 2016, Proc. of 11th Asian Microgravity Symposium, EnglishEvaluation of Flow Development of Vertically Upward One-Component Gas-Liquid Two-Phase Flow based on Void Fraction Characteristics (Preliminary Experiment for Boiling and Two-Phase Flow Experiments on Board ISS)[Refereed]International conference proceedings
- Sep. 2016, Proc. of 10th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, EnglishInfluence of velocity distribution on accuracy of transit-time ultrasonic flow meter[Refereed]International conference proceedings
- May 2016, Proc. of 8th Asian Conference on Refrigeration and Air Conditioning, EnglishFlow Rate Characteristics of CO2 through an Orifice with Inlet Subcooling Condition[Refereed]International conference proceedings
- May 2016, Proc. of 8th Asian Conference on Refrigeration and Air Conditioning, EnglishCondensing Heat Transfer Characteristics in a Quadrilobed Tube Used in Heat Pump Water Heater[Refereed]International conference proceedings
- The ultrasonic pulsed Doppler method (UDM) can obtain a velocity profile along the path of an ultrasonic beam. However, the UDM measurement volume is relatively large and it is known that the measurement volume affects the measurement accuracy. In this study, the effect of the measurement volume on velocity and flow rate measurements is analytically and experimentally evaluated. The velocities measured using UDM are considered to be ensemble-averaged values over the measurement volume in order to analyze the velocity error due to the measurement volume, while the flow rates are calculated from the integration of the velocity profile across the pipe. The analytical results show that the channel width, i.e. the spatial resolution along the ultrasonic beam axis, rather than the ultrasonic beam diameter, strongly influences the flow rate measurement. To improve the accuracy of the flow rate, a novel method using a multi-wave ultrasonic transducer consisting of two piezo-electric elements with different basic frequencies is proposed to minimize the size of the measurement volume in the near-wall region of a pipe flow. The velocity profiles in the near-wall region are measured using an 8 MHz sensor with a small diameter, while those far from the transducer are measured using a hollow 2 MHz sensor in the multi-wave transducer. The applicability of the multi-wave transducer was experimentally investigated using the water flow-rate calibration facility at the National Institute of Advanced Industrial Science and Technology (AIST). As a result, the errors in the flow rate were found to be below -1%, while the multi-wave method is shown to be particularly effective for measuring higher flow rates in a large-diameter pipe.IOP PUBLISHING LTD, Feb. 2016, MEASUREMENT SCIENCE AND TECHNOLOGY, 27(2) (2), English[Refereed]Scientific journal
- This paper deals with subcooled flow boiling experiments using various different dissolved air concentrations in the Perfluorohexane (PFH) in order to clarify its effects on flow boiling heat transfer through a tube with an inner diameter of 4 mm, the following parameters were calculated and discussed: excess temperature and boiling curve. As a result, dissolved air was shown to affect boiling characteristics. In particular, dissolved air significantly affected the boiling curve in the low heat flux region, and the boiling curve was continuously decreased with increasing the effective heat flux for mass flux of 300 kg/(m^2s). Dissolved air significantly also affect the onset of boiling. These effects lead to increasing generation of bubble.The Japan Society of Mechanical Engineers, 2016, The Proceedings of Conference of Kanto Branch, 2016, GS0607-1 - GS0607-2, JapaneseSymposium
- Jan. 2016, International Journal of Microgravity Science and Application, 33(1) (1), English[Refereed]Scientific journal
- Jan. 2016, International Journal of Microgravity Science and Application, 33(1) (1), English[Refereed]Scientific journal
- Experiments were performed to verify the performance of experimental apparatus for the acquisition of reference data for flow boiling heat transfer under the terrestrial condition which is to be compared with that obtained under the microgravity condition onboard International Space Station (ISS) by using another apparatus with the same specification. Test section is a circular tube made of copper with an inner diameter of 4 mm and a heated length of 368 mm and oriented vertically on ground. To improve the accuracy of local heat fluxes, the compensation of heat flux distribution along the tube axis is discussed on the basis of the experimental results on the local heat transfer coefficients for a single-phase liquid flow. Correlations for local heat transfer coefficient of flow boiling are proposed here as functions of boiling number and Martinelli parameter in the regions of nucleate boiling and two-phase forced convection, respectively. Because the discrepancy of local heat transfer coefficient obtained from the apparatus for the terrestrial and the space experiments is caused by the difference of surface roughness in nucleate boiling region, a compensation factor is introduced in the correlation. The local heat transfer coefficients predicted by the proposed correlation are agreed well with those obtained by both apparatus.The Japan Society of Microgravity Application, Jan. 2016, International Journal of Microgravity Science and Application, 33(1) (1), 330105, English[Refereed]Scientific journal
- Jan. 2016, International Journal of Microgravity Science and Application, 33(1) (1), English[Refereed]Scientific journal
- Effect of Wave Height and its Orientation on Heat Transfer Performance of Plate Condenser Used for Heat Pump Water HeaterThis study deals with heat transfer performance of plate condenser used for heat pump water heater in the condition where the refrigerant as superheated vapor is cooled to a subcooling liquid with large subcooling. Since condensate liquid might affect the refrigerant flow distribution, the both effects of the wave height of plates and gravity were examined. The gravity effect was evaluated by the experiments for horizontal and vertical orientation. HFC-134a was used as the working fluid. In the results, a deterioration in heat transfer rate due to the maldistribution of refrigerant flow was observed. The amount of decrease became larger with the larger wave height of the corrugation. The tendency was larger for the horizontal orientation. In the results for plate heat exchanger with single refrigerant path, it was found that the condensing flow behavior for the horizontal orientation was strongly affected by the wave pattern of the corrugation, because the condensed liquid tended to flow along the wave pattern of the lower plate due to gravity. The flow behaviors might cause maldistribution of the refrigerant flow.The Japan Society of Mechanical Engineers, Nov. 2015, Proc. International Conference on Power Engineering-15 (ICOPE-15), 2015(12) (12), #ICOPE - 15-1051, English[Refereed]International conference proceedings
- Sep. 2015, 9th International Symposium on Measurement Techniques for Multiphase Flow (9thISMTMF), 197 - 198, EnglishVisualization of water transport phenomenon in an operating PEFC in the through-plane direction[Refereed]International conference proceedings
- Jul. 2015, Journal of Flow Control, Measurement & Visualization, 3(3) (3), 122 - 133, English[Refereed]Scientific journal
- This study deals with an application of blazed plate heat exchangers to a condenser used in a heat pump water heater. The heat transfer performance was experimentally evaluated by using a pump driven two-phase flow loop in the operating condition for water heating at the environmental temperature. The effects of number of refrigerant paths and setting orientation, such as a vertical orientation with downward refrigerant flow or a horizontal orientation, were evaluated. HFC134a was used as the refrigerant. Superheated vapor was supplied to the condenser, and heated water, and then subcooled liquid was exhausted. Water was supplied to form a counter flow heat exchange. Three kinds of heat exchangers with different refrigerant paths of 6, 10, and 14 were used. Refrigerant temperatures at the exit of each path were measured by inserted thermocouples to evaluate the flow distribution. As a result, it was shown that vertical orientation produced higher heat transfer rate than the horizontal orientation. For the horizontal orientation, heat transfer rate decreased with an increase of refrigerant channels from 10 to 14. The reason would be due to a maldistribution of the refrigerant. The deterioration in heat transfer performance for the horizontal orientation could be improved by the inclination of 15° of the heat exchanger.The Japan Society of Mechanical Engineers, Feb. 2015, Mechanical Engineering Journal, 2(1) (1), English[Refereed]Scientific journal
- A polymer electrolyte fuel cell (PEFC) generates electricity from an electrochemical reaction. However, water accumulation in the gas diffusion layer (GDL) reduces the cell performance. Therefore, the membrane must be kept at the appropriate humidity level for proton conduction. Hence, water management in a PEFC is essential for operation, and it is important to understand the liquid water transport phenomenon in a PEFC. In this study, to clarify the water accumulation phenomenon in the GDL under PEFC operating conditions, neutron radiography was used to visualize and measure the water distribution in the through-plane direction of a small fuel cell. The experimentally and numerically determined 2D water distributions in the through-plane direction of the membrane in the PEFC were compared. The experimental results showed that water accumulation in the GDL under the land was greater than that under the channel during early PEFC operation. Water evacuation from the GDL to the channel occurred mainly around the land corners. The water saturation distributions predicted numerically were similar to the experimental results. The water accumulation rate of the experimental results was lower than that of the numerical results at the beginning of PEFC operation. This was more apparent at a lower current density of 158 mA/cm2. The mole fraction of the vapor in the GDL under the land was higher than that under the channel, and it influenced the water accumulation in the GDL significantly.Begell House Inc., 2015, Multiphase Science and Technology, 27(2-4) (2-4), 117 - 132, English[Refereed]Scientific journal
- This study deals with the departure from nucleate boiling (DNB) of subcooled flow boiling in a horizontal rectangular narrow channel. The effect of the structure of the heating surface, smooth and rough surface produced by thermal spray coating, on heat transfer and flow characteristics in boiling transition from nucleate to film boiling was examined. FC72 was used as the working fluid. The one side of the wall at the center of the narrow channel was replaced with the copper heating surface. The channel height was 4 mm, the channel width was 20 mm, and the heating length was 50 mm. The top wall was replaced with a transparent acrylic resin plate to observe the boiling flow behavior. Average void fraction was measured at the center of the channel by a capacitance probe in the boiling transition from nucleate to film boiling. As the results, the coating produced higher critical heat flux than the smooth surface. A large fluctuation of pressure in synchronization with void fraction fluctuation was observed just before the boiling transition. The fluctuation was caused by periodic change in boiling behavior of nucleate and film boiling. During the pressure fluctuation, the wall temperature gradually increased, and then a stable vapor film was formed. While the wall temperature at the start of the fluctuation for the coated surface was lower than the smooth surface, the effect of the surface structure on the wall temperature at the stable vapor film formation was little.Begell House Inc., 2015, Multiphase Science and Technology, 27(2-4) (2-4), 133 - 146, English[Refereed]Scientific journal
- Estimation of refrigerant distribution in adsorbent bed is important to design an adsorber of an adsorption refrigerating system, because the adsorption and desorption process is complex phenomena with heat and mass transfer, and strongly affects on the cycle performance. The adsorbed refrigerant distribution in a rectangular adsorber was visualized and measured by a neutron radiography method for activated carbon and ethanol pair. Quantitative measurement of adsorbed refrigerant amount was realized by applying the umbra method to compensate neutron scattering effect. It was confirmed from the visualization of adsorbent in equilibrium that the measured results from the radiographs were agreed well with the previous data measured by a weight method. In the experiments of adsorption and desorption process with heat transfer, transient behaviors of adsorbed refrigerant distribution could be clearly visualized. It was clarified from the results that the refrigerant adsorption was dominated by heat diffusion in the adsorbent bed, and adsorbed amount became higher around the heat-transfer surface including fins.International Institute of Refrigeration, 2015, Refrigeration Science and Technology, 567 - 574, English[Refereed]International conference proceedings
- In the case where a brazed plate heat exchanger (BPHE) is used for a water heater in a heat pump system using a high critical point refrigerant, the refrigerant is supplied as a superheated vapor, and condensed to be subcooled liquid with large subcooling. In this case, although both the inlet and exit flow conditions of the refrigerant are single-phase flow, the effect of the refrigerant flow distribution on the heat transfer performance should be considered. In this study, experiments for two BPHEs with 10 paths of refrigerant and the different wave configurations were performed for condensing heat exchange using HFC-134a as the working fluid. Refrigerant temperatures at the exit of each path were measured by inserted sheathed thermocouples to evaluate the flow distribution. Moreover, to understand the flow behaviors in each path, single path experiments were performed. From the results, the larger wave height lead to non-uniform liquid distribution in each path, and the flow structure enhanced maldistribution of refrigerant flow which caused the deterioration of the heat transfer rate. The tendency became quite large for the horizontally placed BPHE.International Institute of Refrigeration, 2015, Refrigeration Science and Technology, 1771 - 1778, English[Refereed]International conference proceedings
- High-temperature heat supply in the range of 100 to 200 °C is required for some processes in industries, such as washing, drying, and sterilizing. Efficient energy utilization is an important concern for these processes. In this study, a heat pump system operating between two heat sources at 100 and 200 °C was constructed as a feasibility study. Firstly, methanol is selected as the refrigerant in a preliminary survey from the view point of similarities to widely-used refrigerants. The constructed system was a simple refrigerating cycle consisting of a two-stage reciprocating compressor and heat exchangers. In the experiments, it could be demonstrated by the system to heat silicone oil to 200 °C with the evaporating temperature at 100 °C. The coefficient of the performance (COP) of the operation was 2.16 due to low adiabatic efficiency of the compressor. It is expected from the analysis of loss in each component that this system can achieve a COP over 3 by improving the overall adiabatic efficiency of the compressor and by deducing heat loss from the connecting section from the compressor to condenser.International Institute of Refrigeration, 2015, Refrigeration Science and Technology, 5002 - 5009, English[Refereed]International conference proceedings
- In order to clarify the water-accumulation phenomena in an operating polymer electrolyte fuel cell (PEFC), the water distribution in a small fuel cell was measured in the through-plane direction by using neutron radiography. The fuel cell had nine parallel channels for classifying the water-accumulation process in the gas diffusion layer (GDL) under the lands and channels. The experimental results were compared with numerical results. The water accumulation in the GDL under the lands was larger than that under the channels during the period of early PEFC operation. The difference of the water accumulation in the GDL under the land and channel was related to the water vapor. Because of the land, the vapor fraction in the GDL under the land was also higher than that under the channel. As a result, condensation was easy to occur in the GDL under the land. (C) 2015 The Authors. Published by Elsevier B.V.ELSEVIER SCIENCE BV, 2015, PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10), 69, 607 - 611, English[Refereed]International conference proceedings
- Adsorption refrigerator is one of the efficient tools for waste heat recovery, because the system is driven by heat at relative low temperature. However, the coefficient of performance is low due to its batch operation and the heat capacity of the adsorber. In order to improve the performance, it is important to optimize the configuration to minimize the amount of driving heat, and to clarify adsorption/desorption phenomena in transient conditions. Neutron radiography was applied to visualize and measure the adsorption amount distribution in an adsorber. The visualization experiments had been performed at the neutron radiography facility of E-2 port of Kyoto University Research Reactor. Activated carbon and ethanol were used as the adsorbent and refrigerant. From the acquired radiographs, adsorption amount was quantitatively measured by applying the umbra method using a checkered neutron absorber with boron powder. Then, transient adsorption and desorption processes of a rectangular adsorber with 84 mm in width, 50 mm in height and 20 mm in depth were visualized. As the result, the effect of fins in the adsorbent layer on the adsorption amount distribution was clearly visualized. (C) 2015 The Authors. Published by Elsevier B.V.ELSEVIER SCIENCE BV, 2015, PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10), 69, 503 - 508, English[Refereed]International conference proceedings
- Visualization of water distribution in an operating PEFC in the through-plane directionA polymer electrolyte fuel cell (PEFC) generates electricity by the electrochemical reaction. It is well known that the water accumulation in the gas diffusion layer (GDL) reduces the cell performances. Hence, it is important to clarify the liquid water transport phenomenon in the PEFC. In this study, visualization of water transport phenomenon in an operating PEFC was carried out by using neutron radiography at Kyoto University Research Reactor (KUR). The two-dimensional water distributions in the through-plane of the membrane in the PEFC were compared between the experimental and the numerical results. The experimental results showed that more water accumulation was occurred in the GDL under the rib than that under the channel, and the analytical results could predict almost the same distributions in the GDL. It was found that the analytical results of water distributions were strongly influenced with the phase-change speed. Mole fraction of the vapor in the GDL under the rib was higher than that under the channel and it influenced the water accumulation in the GDL significantly.2015, ICOPE 2015 - International Conference on Power Engineering, #ICOPE - 15-1040, English[Refereed]International conference proceedings
- Jul. 2014, Proc. of the 44th International Conference on Environmental Systems, Paper No. ICES - 2014-228, EnglishInvestigation of Dissolved Air Effects on Subcooled Flow Boiling Heat Transfer for Boiling Two-Phase Flow Experiment onboard the ISS[Refereed]International conference proceedings
- May 2014, Proc. of the 7th Asian Conference on Refrigeration and Air Conditioning, Paper No. 467, EnglishStudy on the heat transfer and flow characteristics in a single channel plate-fin evaporator[Refereed]International conference proceedings
- May 2014, Proc. of the 7th Asian Conference on Refrigeration and Air Conditioning, Paper No. 344, EnglishFlashing flow characteristics of CO2 through a capillary Tube[Refereed]International conference proceedings
- May 2014, Proc. of the 7th Asian Conference on Refrigeration and Air Conditioning, Paper No. 608, EnglishDevelopment of a heat pump system for high temperature application[Refereed]International conference proceedings
- 日本混相流学会, Mar. 2014, 混相流, 27(5) (5), 547 - 554, Japanese一成分系気液二相垂直上昇流のボイド率特性および流動様式[Refereed]Scientific journal
- 2014, Peoc. of the 15th International Heat Transfer Conference, Paper No. IHTC15 - 9176, English[Refereed]International conference proceedings
- 2014, Peoc. of the 15th International Heat Transfer Conference, Paper No. IHTC15 - 9840, English[Refereed]International conference proceedings
- Nov. 2013, Proc. of the 24th Int. Symp. on Transport Phenomena (ISTP-24), 156 - 159, EnglishDevelopment of Short Transparent Heated Tube for a Better Understanding of the Mechanism of Boiling Heat Transfer[Refereed]International conference proceedings
- Nov. 2013, Proc. of the 24th Int. Symp. on Transport Phenomena (ISTP-24), 300 - 305, EnglishBoiling Flow Structure in a Horizontal Narrow Channel with a Thermal Spray Coating[Refereed]International conference proceedings
- This study deals with an application of blazed plate heat exchangers to a condenser used in a heat pump water heater. The heat transfer performance was experimentally evaluated by using a pump driven two-phase flow loop in the operating condition for water heating at the environmental temperature. The effects of number of refrigerant paths and setting orientation, such as a vertical orientation with downward refrigerant flow or a horizontal orientation, were evaluated. HFC134a was used as the refrigerant. Superheated vapor was supplied to the condenser, and heated water, and then subcooled liquid was exhausted. Water was supplied to form a counter flow heat exchange. Three kinds of heat exchangers with different refrigerant paths of 6, 10, and 14 were used. Refrigerant temperatures at the exit of each path were measured by inserted thermocouples to evaluate the flow distribution. As a result, it was shown that vertical orientation produced higher heat transfer rate than the horizontal orientation. For the horizontal orientation, heat transfer rate decreased with an increase of refrigerant channels from 10 to 14. The reason would be due to a maldistribution of the refrigerant. The deterioration in heat transfer performance for the horizontal orientation could be improved by the inclination of 15° of the heat exchanger.The Japan Society of Mechanical Engineers, Oct. 2013, Proc. of Int. Conf. on Power Engineering (ICOPE-13), Paper No. 205, English[Refereed]International conference proceedings
- May 2013, Proc. of 8th Int. Conf. on Multiphase Flow (ICMF 2013), EnglishSubjects to be Clarified in Flow Boiling Experiments on board International Space Station[Refereed]International conference proceedings
- May 2013, Proc. of 8th Int. Conf. on Multiphase Flow (ICMF 2013), EnglishMeasurement of water distribution and analysis of gas-velocity distribution in an operating PEFC[Refereed]International conference proceedings
- Variable Conductance Heat Pipes (VCHP) are used as a cooling device which can passively keep the evaporating temperature by enclosing non-condensable gas (NCG) with refrigerant. The VCHP has often a bend section between evaporating and condensing area, since the condensation section should be placed vertically above the evaporation section. It is known that the bend may disturb a liquid flow to the evaporation section. The effect of the VCHP orientation, filling ratio of the refrigerant, amount of the charged NCG have been examined. A thin plate was inserted to more the effects of the bend. In this study, the refrigerant behaviors in the VCHP with the bend were diagnosed based on flow visualization by neutron radiography. It was observed that liquid plugs formed at the bend and suppressed the condensed liquid supply to the evaporating section without the thin plate. It was also shown that the thin plate inserted in the bend was effective to avoid the liquid plug formation.日本伝熱学会, Apr. 2013, 日本伝熱学会論文集, 21(2) (2), 59 - 66, Japanese[Refereed]Scientific journal
- Water distributions of a polymer electrolyte fuel cell (PEFC) with 9-parallel channels during operation were visualized using a neutron radiography facility at 84 port in KUR (Kyoto University Research Reactor). An imaging system with a neutron image intensifier (I.I.) was employed for reducing the exposure time, and the water distributions in the in-plane and through-plane directions in the PEW. were alternately obtained every 20 sec. The accumulation processes from the GDL to the channels were confirmed. Water accumulated in the GDL at the cathode and evacuation into the channels started around 5 min Water tended to accumulate at the edge of the ribs, and accumulated as water drops in the channels. The size of the water drops grew up to 1 mm which was the same size as the channel width and height, and the cell voltage was decreased because the liquid drops disturbed the air supply. (C) 2013 The Authors. Published by Elsevier B.A..ELSEVIER SCIENCE BV, 2013, 7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7), 43, 277 - 281, English[Refereed]International conference proceedings
- Hydrogen gas and air are supplied to a polymer electrolyte fuel cell (PEFC). The air and the hydrogen form water and condensation may occur in the cathode side. The generated water may affect the fuel cell performance because of blocking the oxygen from reaching cathode reaction area. An imaging system with a neutron image intensifier (NII) was used for visualizing the water behaviour in the PEFC. The water distributions in the proton exchange membrane (PEM) and the gas diffusion layers (GDL) were measured by the imaging system. Visualization experiments were performed during the PEFC operation in order to clarify the water distributions in the experiments with different utilization. The generated water was discharged into the channel after the amount of water thickness in the GDL increased to a certain value of about 600 mu m in thickness in the through-plane direction. The discharged water formed water drops in the channel. The effects of the water drops in the channel on the fuel cell performance could be observed clearly. It was shown that the cell voltage increased when the water was evacuated. (C) 2013 The Authors. Published by Elsevier B.V.ELSEVIER SCIENCE BV, 2013, 7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7), 43, 288 - 293, English[Refereed]International conference proceedings
- Oct. 2012, Proc. of 9th China-Japan-Korea Workshop on Microgravity Sciences, UFD, EnglishPerformance of Experimental Apparatus for Boiling and Two-phase Flow Experiments under Microgravity onboard ISS[Refereed]International conference proceedings
- Sep. 2012, Proc. of 6th Japanese-European Two-Phase Flow Group Meeting, UFD, EnglishEffect of Heat Transfer Surface Structure on Critical Heat FluxInternational conference proceedings
- Jun. 2012, Proc. of 7th Int. Topical Meeting on Neutron Radiography (ITMNR-7), 58, EnglishVisualization of water behavior in in-plane and through-plane directions of a PEFC using a color image intensifier[Refereed]International conference proceedings
- Jun. 2012, Proc. of 7th Int. Topical Meeting on Neutron Radiography (ITMNR-7), 39, EnglishMeasurements of water distributions in the through-plane direction of a PEFC using a neutron color image intensifier[Refereed]International conference proceedings
- Apr. 2012, Journal of Physical Science and Application, 2(4) (4), 71 - 79, EnglishRecent Progress in JAXA Project of Boiling Two-Phase Flow Experiment onboard ISS[Refereed]Scientific journal
- Mar. 2012, 混相流-混相流研究の進展-, Vol. 25, No. 5, pp. 479-486., Japanese微小重力場におけるポンプ駆動二相流体ループの熱流動特性[Refereed]Scientific journal
- Mar. 2012, Space Utilization Research, Vol.28, pp.109-112, English「きぼう」における強制流動沸騰実験に使用する実験装置について[Refereed]Scientific journal
- THREE-DIMENSIONAL VISUALIZATION OF WATER BEHAVIOR IN POLYMER ELECTROLYTE FUEL CELL BY USING NEUTRON RADIOGRAPHYVisualization of dynamic three-dimensional water behavior in a PEFC stack was carried out by neutron CT using a neutron image intensifier for clarifying water effects on performances of a Polymer Electrolyte Fuel Cell (PEFC) stack. Neutron radiography system at JRR-3 in Japan Atomic Energy Agency was used. An operating stack with three cells based on Japan Automobile Research Institute standard was visualized. A consecutive CT reconstruction method by rotating the fuel stack continuously was developed by using a neutron image intensifier and a C-MOS high speed video camera. The dynamic water behavior in channels in the operating PEFC stack was clearly visualized 15 sec in interval by the developed dynamic neutron CT system. From the CT reconstructed images, evaluation of water amount in each cell was carried out. It was shown that the water distribution in each cell was correlated well with power generation characteristics in each cell.AMER SOC MECHANICAL ENGINEERS, 2012, PROCEEDINGS OF THE ASME POWER CONFERENCE - 2011, VOL 2, #POWER2011-55381, 427 - +, English[Refereed]International conference proceedings
- EFFECT OF SURFACE ROUGHNESS AND MICRO-GROOVES ON CONDENSED WATER REMOVAL IN LATENT HEAT RECOVERY HEAT EXCHANGERHot-water supply has high percentage of energy consumption in Japanese civilian sector. Gas water heaters are used in most cases. Therefore, improvement in thermal efficiency of a gas water heater is an important issue for energy saving. In order to improve thermal efficiency of a gas water heater, an additional heat exchanger is required for latent heat recovery from exhaust humid combustion. The purpose of this study is to develop a compact latent heat recovery heat exchanger with a simple configuration. It is necessary for compactness to reduce the gap between the heat transfer tubes. However, the narrow gap will cause stagnation of condensed water. In order to remove the condensed water from horizontal tube bank, three kinds of tubes with different surface treatments, polished tubes, unpolished tube, and smooth tube with circular micro-grooves, were examined. As the result, condensed water was easily removed by the groove with the 0.7mm depth, to avoid the formation of water bridges between tubes. The effect could lead to no deterioration in the heat transfer performance by decreasing the tube clearance to 1.0mm.AMER SOC MECHANICAL ENGINEERS, 2012, PROCEEDINGS OF THE ASME POWER CONFERENCE - 2011, VOL 1, #POWER2011-55389, 481 - +, English[Refereed]International conference proceedings
- This study deals with the critical heat flux for saturated and subcooled flow boiling in rectangular narrow channels with boiling heat-transfer enhancement surfaces manufactured by a thermal spray coating. The coatings were fabricated on sandblasted copper plates by vacuum plasma spraying using fine copper particle. HCFC123 and FC72 were used as the working fluid for saturated and subcooled flow boiling, respectively. The one side of the wall at the center of the narrow channel was replaced with the heating surface. The channel height was varied 1, 2, and 4 mm, and the channel width was 20 mm. In the saturated flow boiling experiments, the channel was placed in various inclined angles, and the effect of flow and heating direction to gravity on the critical heat flux had beenmeasured. For subcooled boiling, the flows were horizontal flows with bottom heating, and the effect of inlet subcooling degree on the critical heat flux had been measured. These experimental results were compared with those for a smooth surface. As for the results, for saturated flow boiling, the critical heat flux was very sensitive to the change in the channel inclined angle. The effect of the surface structure on the critical heat flux was minimal. On the other hand, for subcooled flow boiling, the critical heat flux of the coating increased by about 20% in the condition with a large degree of subcooling of 40 K. The reason might be that vapor bubbles generated on the coating were immediately condensed in bulk subcooled liquid due to its smaller diameter. For both surfaces, large pressure fluctuation was observed just before burnout in the flow condition with a large degree of subcooling of 40 K. © 2012 by Begell House, Inc.2012, Multiphase Science and Technology, 24(3) (3), 181 - 196, English[Refereed]Scientific journal
- Nov. 2011, エネルギー・資源学会論文誌, Vol. 32, No. 6, pp. 7-13., Japanese分散蓄熱技術を利用した集合住宅用コージェネレーションシステムへの太陽熱の導入効果[Refereed]Scientific journal
- Visualization of dynamic three-dimensional water behavior in a polymer electrolyte fuel cell (PEFC) stack was carried out by neutron CT using a neutron image intensifier. The neutron radiography system at JRR-3 in Japan Atomic Energy Agency was used. An operating stack with three cells based on Japan Automobile Research Institute standard was visualized. A consecutive CT reconstruction method by rotating the fuel stack continuously was developed using a neutron image intensifier and a C-MOS high speed video camera. The dynamic water behavior in channels in the operating PEFC stack was clearly visualized in 15 s intervals by the present dynamic neutron a system. (C) 2011 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Sep. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 277 - 281, English[Refereed]Scientific journal
- A capillary tube is often used as a throttle for a refrigerating cycle. Subcooled refrigerant usually flows from a condenser into the capillary tube. Then, the refrigerant is decompressed along the capillary tube. When the static pressure falls below the saturation pressure for the liquid temperature, spontaneous boiling occurs. A vapor-liquid two-phase mixture is discharged from the tube. In designing a capillary tube, it is necessary to calculate the flow rate for given boundary conditions on pressure and temperature at the inlet and exit. Since total pressure loss is dominated by frictional and acceleration losses during two-phase flow, it is first necessary to specify the boiling inception point. However, there will be a delay in boiling inception during decompressed flow. This study aimed to clarify the boiling inception point and two-phase flow characteristics of refrigerant in a capillary tube. Refrigerant flows in a coiled copper capillary tube were visualized by neutron radiography. The one-dimensional distribution of volumetric average void fraction was measured from radiographs through image processing. From the void fraction distribution, the boiling inception point was determined. Moreover, a simplified CT method was successfully applied to a radiograph for cross-sectional measurements. The experimental results show the flow pattern transition from intermittent flow to annular flow that occurred at a void fraction of about 0.45. (C) 2011 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Sep. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 258 - 263, English[Refereed]Scientific journal
- Fuel gas (hydrogen gas) and oxidant gas (air) are supplied to a polymer electrolyte fuel cell (PEFC). Protons pass through the electrolyte membrane, and combine with oxygen to form water in the cathode reaction site. The generated water must be supplied appropriately to the membrane for proton conduction. On the other hand, the generated water may affect the fuel cell performances because of the blocking of oxygen from reaching the cathode reaction site. Therefore, water management in the PEFC is important, and water distribution during the operation in the through-plane direction has been of wide concern. In order to obtain the water distributions in a membrane electrode assembly (MEA) and a gas diffusion layer (GDL), a borescope system was newly employed using neutron radiography. The system could obtain the water distribution in the MEA and the GDL, and pixel size of 6.5 mu m was achieved. Furthermore, the system was applied for a tilted converter system. The pixel of 1.0 mu m at an angle of 81 degrees was achieved, and improvement of the spatial resolution was confirmed. (C) 2010 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Sep. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 286 - 289, English[Refereed]Scientific journal
- Fuel gas (hydrogen gas) and oxidant gas (air) are supplied to a polymer electrolyte fuel cell (PEFC). Condensation may occur in the cathode side, since the air might be super-saturated by the fuel cell reactions. If condensed water exists in a gas diffusion layer (GDL) or the gas channels, it may affect the fuel cell performances because it blocks the oxygen from reaching the cathode reaction site. Thus, water management in the PEFC is important. In order to clarify water effects on performances of a PEFC, visualization and quantitative measurements of water distributions in a PEFC were carried out by means of neutron radiography. Two-dimensional water distributions were obtained, and water ejection was confirmed. It was found that the water easily accumulated in the GDL under the rib rather than under the channel at beginning of the operation. Furthermore, a network analysis of gas-velocity distribution is applied for the experimental results. It analyzes the gas-velocity distributions depending on the flow resistance, which is the pressure drop. Applying the measured data of water thickness, gas-velocity distributions were obtained in the channel and the GDL. From the calculation, air supply in the GDL dramatically decreased with increasing of water accumulation. (C) 2010 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Sep. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 290 - 296, English[Refereed]Scientific journal
- Neutron radiography is one of the useful tools for visualizing water behavior in operating fuel cells. In order to observe the detailed information about the water distribution in membrane electrode assembly (MEA) and gas diffusion layer (GDL) in fuel cells, a high performance neutron imaging system is required. A neutron color image intensifier (NCII) is a high spatial resolution and high sensitivity neutron image detector. We have developed an imaging system using an NCII for visualizing the behavior of water in fuel cells. The pixel size of the imaging system is around 4.7 mu m in the small view field. By using this system, water distribution of a small sized fuel cell was observed continuously every 20 s at the Thermal Neutron Radiography Facility (TNRF). In the results, the water area appears from the GDL and MEA regions, and expanded to the cathode side channel with time. However, the voltage was gradually reduced with time, and steeply dropped. It is considered that the reduction and the drop of voltage were caused by a blockage of gas flow due to accumulation of water in the GDL and the gas flow channel in the cathode side. (C) 2011 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Sep. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 268 - 272, English[Refereed]Scientific journal
- A Variable Conductance Heat Pipe (VCHP) is used as a cooling device for electrical equipments. The condensation area is passively controlled by the non-condensable gas volume in the VCHP depending on the heat load. The VCHP has often a bent pipe between the evaporation and condensation area. The heat pipe performance depends much on the bent pipe shape and configuration because a liquid plug is formed in the bent pipe and disturbs the refrigerant circulation. However, the mechanism has not been clarified well. The neutron radiography system at the JRR-3 in Japan Atomic Energy Agency (JAEA) was used to visualize the refrigerant behavior in the VCHP. Effects of the thin plate inserted in the pipe, refrigerant filling ratios and heat pipe configuration were examined on the heat pipe performance. The liquid plug was formed at the bend and caused to decrease the performance. It was confirmed that the thin plate insert was effective to disturb the liquid plug formation. (C) 2011 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Sep. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 264 - 267, English[Refereed]Scientific journal
- Aug. 2011, Proc. of Int. Conf. on Advanced Technology in Experimental Mechanics 2011 (ATEM’11), pp.288, EnglishQuantitative Measurements of Water Distribution in a PEFC by using Neutron Radiography and Analysis of Gas-velocity Distributions[Refereed]Scientific journal
- Jul. 2011, Heat Transfer—Asian Research, doi: 10.1002/htj.20376, EnglishEnergy Supply Performance and Environmental Load-Reduction[Refereed]Scientific journal
- Jun. 2011, Proc.of the 28th International Symposium on Space Technology and Science, 2011-h-31, EnglishGround Test on Boiling Two-phase Flow Prepared for the Experiments onboard International Space Station[Refereed]Scientific journal
- Jun. 2011, Proc.of the 28th International Symposium on Space Technology and Science, 2011-h-30, EnglishA Report of a Current Status of an International Space Station "KIBO" Project -Interfacial Behaviors and Heat Transfer Characteristics in Boiling Two Phase Flow[Refereed]Scientific journal
- 2011, Space Utilization Research, Vol.27, pp.94-97, English「きぼう」日本実験棟における沸騰二相流実験実施に向けた地上要素試験[Refereed]Scientific journal
- 2011, 41st International Conference on Environmental Systems 2011, ICES 2011, No.2011-5141, pp.1780-1788, EnglishGround test loop for Interfacial behaviors and heat transfer characteristics in boiling two phase flow (JEM-TPF)[Refereed]International conference proceedings
- EFFECT OF SURFACE TREATMENT BY THERMAL SPRAY COATING ON BOILING HEAT TRANSFER PERFORMANCEThis study deals with a boiling heat transfer enhancement by a thermal spray coating. The coating was fabricated by vacuum plasma spraying using fine copper particle. The boiling heat transfer performance in a narrow channel was experimentally examined. The effects of the flow condition, the heating condition, and the channel inclined angle, on the heat transfer coefficient and the critical heat flux were considered. The experiments were conducted for saturated flow boiling of HCFC123 and subcooled flow boiling of FC72. The experimental results show that the coating could improve the boiling heat transfer coefficient. There was a little effect of the channel height on the boiling heat transfer for each surface. The effect of the channel inclined angle was observed only for the coating in the low quality and the low mass flux condition. The horizontal flow with the top heating produced the highest heat transfer coefficient for the coating. There is no marked effect of the channel inclined angle in the high quality and the high mass flux region. For the subcooled flow boiling, the critical heat flux, CHF, increased about 20 % by the coating in the condition with large subcooling degree of 40 K. The reason might be that vapour bubbles over the coating were immediately condensed due to the smaller diameter.INT INST REFRIGERATION, 2011, 23RD IIR INTERNATIONAL CONGRESS OF REFRIGERATION, 23, 2762 - 2770, English[Refereed]International conference proceedings
- A dynamic CT system was developed for visualization of consecutive three-dimensional water behavior in a PEFC stack for neutron radiography. The system is composed of a neutron image intensifier and a C-MOS high speed video camera. An operating stack with three cells based on the Japan Automobile Research Institute standard was visualized using the neutron radiography system at a research reactor JRR-3 in Japan Atomic Energy Agency. The dynamic water behavior in channels in the operating PEFC stack was clearly visualized every 15 seconds by using the system. The water amount in each cell was evaluated by the CT reconstructed images. It was shown that a cell voltage decreased gradually when the water increased and increased rapidly when the water was evacuated. It was estimated that the power generation stopped when the channel of a cell was partly filled with the water because the air supply was blocked to a cell in the stack. © 2011 The Japan Society of Mechanical Engineers.2011, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 77(784) (784), 2255 - 2262, Japanese[Refereed]Scientific journal
- Boiling is one of the efficient modes of heat transfer due to phase change, and is regarded as promising means to be applied for the thermal management systems handling a large amount of waste heat under high heat flux. However, gravity effects on the two-phase flow phenomena and corresponding heat transfer characteristics have not been clarified in detail. The experiments onboard Japanese Experiment Module "KIBO" in International Space Station on boiling two-phase flow under microgravity conditions are proposed to clarify both of heat transfer and flow characteristics under microgravity conditions. To verify the feasibility of ISS experiments on boiling two-phase flow, the Bread Board Model is assembled and its performance and the function of components installed in a test loop are examined.IOP PUBLISHING LTD, 2011, INTERNATIONAL SYMPOSIUM ON PHYSICAL SCIENCES IN SPACE, 327, English[Refereed]International conference proceedings
- In order to spread economically viable distributed generation systems for apartment buildings, it is essential to develop an efficient and low-cost heat supply system. We are developing a new cogeneration system (Neighboring CoGeneration system: NCG system). The key concept of this system is to install a heat storage unit in each house for hot water supply and room heating and to connect heat storage units by a single-loop hot water pipe. The system leads to time leveling of the total heat supply and reduction of installation cost. Furthermore, it is expected that the cogeneration can operate according to electricity demand because of the large heat capacity of accumulation of the system. In this study, a dynamic simulation model was developed to evaluate the performance of the heat supply system and the environmental load-reduction effect of the NCG system for 50 households. It showed that the NCG system can supply enough heat for peak demand in winter and decrease 23% in CO_2 emission on yearly average.The Japan Society of Mechanical Engineers, Dec. 2010, 日本機械学会論文集(B編), Vol. 76, No. 772, pp. 2203-220(772) (772), 2203 - 2209, Japanese[Refereed]Scientific journal
- Jun. 2010, Trans. of the Japan Societies of Refrigerating and Air Conditioning Engineers, Vol. 27, No. 2, pp. 113-124, Japanese曲がり管内気液二相流に及ぼす遠心力の影響に関する研究[Refereed]Scientific journal
- Jun. 2010, Proc. of 7th International Conference on Multiphase Flow, #2.6.1, EnglishMeasurement of Water Thickness by using Neutron Radiography and Simulation of Gas-Velocity Distribution in a PEFC[Refereed]Scientific journal
- Jun. 2010, Proc. of 7th International Conference on Multiphase Flow, #3.3.4, EnglishFlow visualization of refrigerant behaviors in a self-vibration heat pipe[Refereed]Scientific journal
- Jun. 2010, Proc. of the Fifth Asian Conference on Refrigeration and Air Conditioning (ACRA), A4-076, EnglishBoiling Heat Transfer Enhancement by Thermal Spray Coating in a Narrow Channel[Refereed]Scientific journal
- 2010, KURRI Progress Report, 113 - 113, EnglishStudies on Boiling Two-phase Flow by Neutron Radiography
- Water behavior in an operating polymer electrolyte fuel cell (PEFC) was visualized by using neutron radiography, and the cell voltage and the pressure drop between the inlet and outlet of air were simultaneously measured. The PEFC is compliant with Japan Automobile Research Institute (JARI) standard PEFCs. An electrode area of 50×50 mm2 was visualized, and the cell temperature was kept at 80°C. The effects of channel geometry, i.e., single- and triple-serpentine, relative humidity of air, and current density, were investigated. From the experiments, it can be confirmed that fluctuation of area-average water thickness in a triple-serpentine channel is larger than that in a single-serpentine channel, and water in the channel is likely to accumulate at corners of the channel in the single- serpentine channel. Furthermore, movement of condensed water is strongly related to cell voltage and pressure drop. For a few minutes after the operation, the average thickness of water at the rib is thicker than that at the channel. Furthermore, a network modeling to predict the gas-velocity distributions was proposed. Based on the water depth in the channel and the gas diffusion layer, gas-velocity distributions were obtained. The pressure drops in single-phase flow were in good agreement with the experimental results under low gas-flow rate. The model could predict the pressure drop based on the water thickness in the PEFC. © 2010 by Begell House, Inc.2010, Multiphase Science and Technology, 22(1) (1), 57 - 78, English[Refereed]Scientific journal
- Jan. 2010, Proc. of 2010 Int. Symp. on Next-Generation Air Conditioning and Refrigeration Technology, GS14, EnglishHeat Transfer Enhancement in Evaporation by Thermal Spray Coating[Refereed]Scientific journal
- A self-vibration heat pipe having a meandering capillary tube can operate on top and horizontal heat mode without gravity effects. However, the behaviors of the working fluid in the pipe have not been well studied. In this study, the working fluid in the self-vibration heat pipe was visualized by neutron radiography system in Japan Atomic Energy Agency. The liquid columns formed in the cooling area were visualized at 200 frames/s in the meandering channel. Image processing methods to show the vibration of the liquid column were developed. It was shown that the liquid columns were vibrated around the cooling area and supplied to the heating area. The heat was transported from the heating area to the cooling area. The maximum effective thermal conductivity of the plates were about 20 times of aluminum. The flow pattern was evaluated at the volumetric ratio of liquid phase in the heat pipe. The periods of the vibration were predicted fairly well by a mass-spring model.Japan Society of Mechanical Engineers, 2010, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 76(766) (766), 975 - 982, Japanese[Refereed]Scientific journal
- Boiling heat transfer enhancement is efficient for development of a cold plate used in a two-phase flow loop type thermal control system. This study deals with boiling heat transfer enhancement for a narrow channel by thermal spray coating of metal. Copper particles were coated on the heating surface by vacuum plasma spraying. Two kinds of surface were manufactured using different particle size, about 200 and 50 µm. The heat transfer performance was evaluated in saturated flow boiling experiments of HCFC123 for ranges of mass flux of 100 to 400 kg/(m2•s), inlet quality of 0 to 0.60, and heat flux of 25 to 251 kW/m2. The test channel with the width of 20 mm, and heated length of 100 mm was placed horizontally. The lower side of heating area was heated by cartridge heaters through a copper block. The channel gap was set to 2 and 4 mm. As the result, the coating surface produced higher heat transfer coefficient than the smooth surface, especially, the heat transfer performance of the surface using finer particle was higher and was about 5 to 10 times higher than that of the smooth surface. While the effect of gaps on the heat transfer coefficient was a little, the critical heat flux increased with increasing the channel gap. Critical heat flux was increased a little by thermal spray coating.THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, Aug. 2009, Trans. Japan Society for Aeronautical and Space Sciences, Space Technology Japan, Vol.7, No. ists26, pp. Ph_35-P(26) (26), Ph_35 - Ph_41, English[Refereed]Scientific journal
- Neutron radiography is suitable for the visualization of liquid behavior in a metallic machine. Observation of oil behavior in a small 4-cycle engine on operating was carried out by using the neutron radiography facility at JRR-3 in JAEA. The engine was not fired but operated by an electrical motor. Movies were taken by a neutron image intensifier with a color CCD camera of 8-bit resolution, 30 frames/s and 640 x 480 pixels developed by Toshiba Corp. The engine was placed on a turn table and was rotated, so the movie could be taken from any angle. Numbers of revolution of the engine were changed from 260 to 1200 rpm. Visualized images of the mechanism and the oil behavior in the engine were obtained. (C) 2009 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Jun. 2009, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 204 - 207, English[Refereed]Scientific journal
- A polymer electrolyte fuel cell (PEFC) consists of a membrane electrode assembly (MEA), gas diffusion layers (GDL), hydrogen and oxygen supply channels. At the anode, protons and electrons are generated, while at the cathode the protons and electrons combine to form water. The condensed water may affect the fuel cell performance. In order to clarify the effect of water distribution on the PEFC performance, three-dimensional water distribution in the PEFC was visualized by using a neutron radiography facility at JRR-3 in JAEA. For observing the detailed water distribution, a small sized PEFC was designed. Size of the gas channel is 1 mm width and 0.5 mm depth. Thickness of the MEA and the GDL are about 50 and 200 mu m. The electrode area is 0.35 x 3.5 cm(2). The PEFC was set on an automatic rotating stage, and a picture was taken every 2.25 degrees by using a cooled CCD camera with grey scale of 16 bit. The exposure time was set at 15 s. Using the 80 pictures which correspond to 180 degrees, a computed tomography (CT) was carried out. In order to observe water distribution with high spatial resolution, the LiF scintillator with a thickness of 50 mu m was used. From the water distributions parallel and perpendicular to the MEA, existence of water around O-ring can be confirmed. However, the detailed distribution in the PEFC is difficult to obtain from the two-dimensional pictures. On the other hand, CT pictures make possible to obtain the three-dimensional water distribution. In this study, the spatial resolution of 76.5 mu m was achieved, and existence of water in the PEFC could be confirmed. (C) 2009 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Jun. 2009, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 131 - 133, English[Refereed]Scientific journal
- Boiling two-phase flows in a single-channel commercial brazing plate heat exchanger were visualized by thermal neutron radiography method, and the effect of flow direction, such as vertically upward or downward, on liquid distribution in the channel and boiling heat transfer performance was considered. The experiments had been carried out using thermal neutron radiography facility of JRR-3 of JAEA in Japan. The relationship between heat transfer coefficients and flow behaviors for three kinds of inlet condition, such as subcooled liquid, Saturated liquid, and wet vapor, was investigated, Though vertically upward flow is generally selected for boiling flow to remove vapor bubble from heating surface by buoyancy force, it was shown from the result that downward boiling flow produced higher heat transfer performance than upward flow. Especially, the tendency was remarkable at low-quality condition. From the visualization results, it could be clearly observed that there was a large difference between upward and downward in-flow pattern around the inlet. The results show that the lowering of heat transfer performance was caused by the difference of flow pattern. (C) 2009 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Jun. 2009, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 142 - 145, English[Refereed]Scientific journal
- Heat generation density of electric elements increases close to the limit of forced air-cooling. New cooling technology is required and a self-vibration heat pipe is proposed for the electric elements cooling. The self-vibration heat pipe, which has a meandering capillary channel, can operate for vertical and horizontal heat removal without gravity effects. However, the behaviors of the working fluid in the pipe have not been well studied. The purpose of this study is to clarify the working fluid phenomena in the heat pipe. The working fluid in the pipe was visualized by neutron radiography system at JRR-3 in Japan Atomic Energy Agency. The liquid columns in the meandering channel of the heat pipe were recorded by a highspeed camera. The obtained images were segmented and the meandering capillary channel was uncoiled by image processing methods to show the temporal vibration of the liquid columns in the stretched channel. Periods of the column oscillation were about 0.5-1.5 s. The oscillation of the columns was analyzed by a mass-spring model. The periods of the oscillation were obtained and compared with the experiment results. It was shown that the analytical values agreed fairly with the experimental ones. (C) 2009 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Jun. 2009, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 200 - 203, English[Refereed]Scientific journal
- In order to clarify the effects of water on performances of a Polymer Electrolyte Fuel Cell (PEFC), measurements of water distribution in a Japan Automobile Research Institute (JARI) standard PEFC Were carried out by means of neutron radiography. Furthermore, the cell voltage and the pressure drop between inlet and outlet of the air were simultaneously measured. The effects of channel geometry, i.e. single-serpentine and three-serpentine, and relative humidity of air were investigated. The experimental conditions were current density of 200 mA/cm(2), hydrogen utilization of 9.5% and oxygen utilization of 40%. The membrane electrode assembly (MEA) area was 5 x 5 cm(2). The pictures were taken every 15 s with an exposure time of 12 s. The spatial resolution was 108 mu m. From the measurements, the relation between cell voltage, pressure drop and movement of the water plug in the channel was confirmed. The PEFC performances were recovered as the water plug evacuated. Condensed water in the channel decreased with the relative humidity of air. However, it may affect the MEA permanence. Therefore, the most appropriate operating conditions should be decided for taking into account both the cell performances and the permanencies. (C) 2009 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Jun. 2009, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 127 - 130, English[Refereed]Scientific journal
- Visualization and Measurement of Water Behavior in PEFC by using Neutron RadiographyIn this study, water behavior in an operating PEFC was visualized by using neutron radiography, and the cell voltage and the pressure drop between inlet and outlet of air were simultaneously measured. The PEFC is compliant with JARI (Japan Automobile Research Institute) standard PEFC. Electrode area with 50x50 mm(2) was visualized, and the cell temperature was kept at 80 degrees C. The effect of geometry, i.e. single-serpentine and three-serpentine, relative humidity of air and current density were investigated. From the experiments, it can be confirmed that fluctuation of area-average water thickness in three-serpentine channel is larger than that in single-serpentine channel and water in the channel is likely to accumulate at corners of the channel in single-serpentine channel. Furthermore, movement of condensed water is strongly related with the cell voltage and the pressure drop.JAPAN SOC MECHANICAL ENGINEERS, 2009, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON POWER ENGINEERING 2009 (ICOPE-09), VOL 2, 2, pp.225-230, 225 - 230, English[Refereed]International conference proceedings
- DYNAMIC SIMULATION OF NEW CENTRAL HOT WATER SUPPLY SYSTEM FOR RESIDENTIAL BUILDINGIn order for economically viable distributed generation systems to spread to residential buildings, it is essential to develop an efficient and low-cost hot water supply system. A new hot water supply system had been proposed for this purpose. The key technology for the system is to connect compact heat storage units installed in each household by a single loop of hot water piping. A prototype plastic tank for heat storage was made and tested in heat storage and heat release operation. Since the cross section area of the tank is small, thermal stratification could be kept in heat release process. On the other hand, in heat storage process, water in the tank was perfectly mixed by incoming hot water flow from the bottom of the tank. Dynamic simulation model of the system for 50 households was constructed on a process simulator using a heat storage tank model, and heat supplying performance was evaluated from the calculated results for heat demand patterns obtained by a field research.JAPAN SOC MECHANICAL ENGINEERS, 2009, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON POWER ENGINEERING 2009 (ICOPE-09), VOL 1, 1, pp.287-292, 287 - +, English[Refereed]International conference proceedings
- DEVELOPMENT OF COMPACT LATENT HEAT RECOVERY HEAT EXCHANGER FOR GAS WATER HEATER IN HOUSEHOLD USESince hot-water supply has high percentage of energy consumption in civilian sector of Japan, improvement in efficiency of a gas water heater is an important issue. In order to improve thermal efficiency of a gas water heater, an additional heat exchanger is required for latent heat recovery from exhaust humid combustion. It is necessary to design heat exchanger for various gas conditions, such as flow rate and temperature of gas and water, gas humidity. Compactness is also strongly required. The purpose of this study is to develop a design approach based on numerical simulation of latent heat recovery heat exchanger. Dewdrops on a heat transfer surface may adversely affect its heat transfer performance. In this paper, two methods for removal of dewdrop were examined. One is a vertical tube bank heat exchanger, and the other is microgrooves on horizontal tubes. The designed secondary heat exchanger was mounted on a commercial gas water heater, and could improve the thermal efficiency to about 95.5% (HHV).JAPAN SOC MECHANICAL ENGINEERS, 2009, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON POWER ENGINEERING 2009 (ICOPE-09), VOL 1, 1, pp.329-334, 329 - +, English[Refereed]International conference proceedings
- Boiling heat transfer enhancement is efficient for development of a cold plate used in a two-phase flow loop type thermal control system. This study deals with boiling heat transfer enhancement for a narrow channel by thermal spray coating of metal. Copper particles were coated on the heating surface by vacuum plasma spraying. Two kinds of surface were manufactured using different particle size, about 200 and 50 µm. The heat transfer performance was evaluated in saturated flow boiling experiments of HCFC123 for ranges of mass flux of 100 to 400 kg/(m2•s), inlet quality of 0 to 0.60, and heat flux of 25 to 251 kW/m2. The test channel with the width of 20 mm, and heated length of 100 mm was placed horizontally. The lower side of heating area was heated by cartridge heaters through a copper block. The channel gap was set to 2 and 4 mm. As the result, the coating surface produced higher heat transfer coefficient than the smooth surface, especially, the heat transfer performance of the surface using finer particle was higher and was about 5 to 10 times higher than that of the smooth surface. While the effect of gaps on the heat transfer coefficient was a little, the critical heat flux increased with increasing the channel gap. Critical heat flux was increased a little by thermal spray coating.THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, Jun. 2008, Proc. of 26 th International Symposium on Space Technology and Science on CD-Rom, Paper No. 2008-h-31(26) (26), Ph_35 - Ph_41, English[Refereed]Scientific journal
- May 2008, 日本機械学会論文集(B編), 74巻, 741号, pp.1107-1113, JapaneseVoid fraction characteristics of gas-liquid two-phase flow in a small diameter tube[Refereed]Scientific journal
- With the global warming problem aggravating and subsequent implementation of the Kyoto Protocol, CO2 emissions are becoming an important factor when verifying the usability of cogeneration systems. Considering this, the purpose of this work is to study the effect of the capacity of a cogeneration system on its CO2 emissions under two kinds of operation strategies: one focused on exergetic efficiency and another on running cost. The system meets the demand pattern typical of a hospital in Japan, operating during one year with an average heat-to-power ratio of 1.3. The main equipments of the cogeneration system are: a gas turbine with waste heat boiler, a main boiler and an auxiliary steam turbine. Each of these equipments was characterized with partial load models, and the turbine efficiencies at full load changed according to the system capacity. Still, it was assumed that eventual surplus of electricity generated could be sold. The main results showed that for any of the capacities simulated, an exergetic efficiency-focused operational strategy always resulted in higher CO2 emissions reduction when compared to the running cost-focused strategy. Furthermore, the amount of reduction in emissions decreased when the system capacity decreased, reaching a value of 1.6% when the system capacity was 33% of the maximum electricity demand with a heat-to-power ratio of 4.1. When the system operated focused on running cost, the economic savings increased with the capacity and reached 42% for a system capacity of 80% of maximum electricity demand and with a heat-to-power ratio of 2.3. In such conditions however, there was an increase in emissions of 8.5%. Still for the same capacity, an exergetic efficiency operation strategy presented the best balance between cost and emissions, generating economic savings of 29% with a decrease in CO2 emissions of 7.1%. The results found showed the importance of an exergy-focused operational strategy and also indicated that lower capacities resulted in lesser gains of both CO2 emissions and running cost reduction.The Japan Society of Mechanical Engineers, Apr. 2008, Journal of Power and Energy Systems, Vol. 2, No. 4, pp. 1178-1187(4) (4), 1178 - 1187, English[Refereed]Scientific journal
- Visualization of water behavior in a polymer electrolyte fuel cell was conducted by neutron radiography. Real-time video images and high-resolution still images were photographed with measurement of fuel cell performance. It was clearly visualized by real time imaging that water condensed in an air supply line was coming into a fuel cell. In this case the cell voltage decreased when water flowed into the cathode side. On the other hand, no effect of condensed water into the anode side was observed on the cell performance. In the high resolution still imaging, water amount was measured quantitatively. The water thickness was evaluated for the gas diffusion layer (GDL) covered by ribs and channel part with GDL separately. It was shown that the higher oxygen utilization, i.e. lower air flow rate, caused an increase of water amount and lowering of cell voltage. It can be said that water amount in the PEFC might strongly depend on airflow rate, and the cell voltage might be affected by the water amount.The Japan Society of Mechanical Engineers, Mar. 2008, Journal of Power and Energy Systems, Vol. 2, No. 3, pp. 997-1008(3) (3), 997 - 1008, English[Refereed]Scientific journal
- In order for economically viable distributed generation systems for local communities to be widely accepted, it is essential to develop an efficient and low-cost heat supply system. For this purpose, we propose a new heat supply system which we already presented at the ICOPE-05 Chicago. The key technology for the system is to connect compact heat supply units with a heat storage function installed in all the households of the local community, such as condominiums, by a single-loop of hot water pipe. A phase change material was used for the heat supply unit as the heat storage material. However, for easier handling and reducing the cost of the unit, we have developed a new heat supply unit whose heat storage tank is made of plastic. Hot water for space heating is used as the heat storage material. Further we constructed a heat supply system for 7 lived-in households with a 5 kW gas engine and a 42 kW boiler as the heat sources.The Japan Society of Mechanical Engineers, Mar. 2008, Journal of Power and Energy Systems, Vol. 2, No. 3, pp. 1085-1095(3) (3), 1085 - 1095, English
Some experiments with a heat supply unit and a heat supply system, such as for heat storage and heat supply for peak demand were conducted. Additionally, dynamic simulations of heat demand by 50 households and a COP evaluation of a new CO2 heat pump system using low-temperature exhaust gas from the gas engine were also conducted.[Refereed]Scientific journal - 2008, International Journal of Exergy, 5, 296, English[Refereed]Scientific journal
- Visualization and Measurement of Hygroscopic Water Distribution in a Unit Cell of Silica-Gel Adsorber by Neutron RadiographyEvaluation of hygroscopic water distribution in adsorber is important to design adsorption refrigerating system, because the adsorption and desertion process strongly affect on the cycle performance. A neutron radiography method was applied to a diagnosis of a silica-gel adsorber, such as nondestructive testing of the structure of particle layer and real-time measurement of hygroscopic water distributions. Silica gel particles of diameter around 0.5 mm were used. A silica-gel unit was made by filling the silica-gel particles between fins on the outside of an aluminum cylinder. Two fixing methods were applied for making the particle layer. One is a fixing with vinyl acetate glue, and in the other method particles were packed without grew and covered by a wire sheet. The internal structure of the unit with the grew was successfully visualized with the spatial resolution of 107 gm. From the visualized images, 3-D structure of the unit with the grew was clearly obtained by a computed tomography method. From the comparison between dry and wet condition, hygroscopic water distribution could be measured. Moreover, radial distribution could be obtained by Abel transform on the assumption of axial symmetry. In the case that particles were fixed using a binder, it was shown that the particle binder reduced adsorption amount into the particle layer.DESTECH PUBLICATIONS, INC, 2008, NEUTRON RADIOGRAPHY, Vol.40, No.13, pp.1292-1297, 499 - +, English[Refereed]International conference proceedings
- Void Fraction Characteristic of Gas-Liquid Two-Phase Flow in Mini-ChannelsFlow visualization and measurement of void fraction distributions are important to understand the complex flow characteristics in gas-liquid two-phase flow. Flow characteristics in the small diameter system maybe differ from the large diameter because the interfacial tension becomes large. In this study, characteristics of the void fraction of gas-liquid two-phase flow in circular tubes with 2mm to 10mm inside diameter were measured by neutron radiography to investigate the effect on the inside diameter.DESTECH PUBLICATIONS, INC, 2008, NEUTRON RADIOGRAPHY, pp.374-380, 374 - +, English[Refereed]International conference proceedings
- Visualization and Measurement of Hygroscopic Water Distribution in a Unit Cell of Silica-Gel Adsorber by Neutron RadiographyEvaluation of hygroscopic water distribution in adsorber is important to design adsorption refrigerating system, because the adsorption and desertion process strongly affect on the cycle performance. A neutron radiography method was applied to a diagnosis of a silica-gel adsorber, such as nondestructive testing of the structure of particle layer and real-time measurement of hygroscopic water distributions. Silica gel particles of diameter around 0.5 mm were used. A silica-gel unit was made by filling the silica-gel particles between fins on the outside of an aluminum cylinder. Two fixing methods were applied for making the particle layer. One is a fixing with vinyl acetate glue, and in the other method particles were packed without grew and covered by a wire sheet. The internal structure of the unit with the grew was successfully visualized with the spatial resolution of 107 gm. From the visualized images, 3-D structure of the unit with the grew was clearly obtained by a computed tomography method. From the comparison between dry and wet condition, hygroscopic water distribution could be measured. Moreover, radial distribution could be obtained by Abel transform on the assumption of axial symmetry. In the case that particles were fixed using a binder, it was shown that the particle binder reduced adsorption amount into the particle layer.DESTECH PUBLICATIONS, INC, 2008, NEUTRON RADIOGRAPHY, pp.499-508, 499 - +, English[Refereed]International conference proceedings
- Visualization and Measurement of Dynamic Water Behavior in PEFC by Neutron RadiographyIn a PEFC, hydrogen gas and air are supplied in saturated moist condition to keep a membrane wet. Condensation may occur in the cathode, since air is super-saturated by the FC reaction. The condensed water may affect on the FC performance. In this study, water behaviors in the operating PEFC were visualized by neutron radiography with measuring the cell voltage. A JARI standard cell was improved for the visualization with the same performance. From the visualization and measurement results, the relationship between water behaviors and cell voltage fluctuations was clearly shown.DESTECH PUBLICATIONS, INC, 2008, NEUTRON RADIOGRAPHY, pp.381-388, 381 - +, English[Refereed]International conference proceedings
- Effect of exergy optimisation on a cogeneration system's CO2 emissions according to different demand patternsThe objective of this work is to verify how different operational strategies affect the CO2 emissions of a cogeneration system according to different demand patterns. The operation strategies studied were focused in running cost and exergetic efficiency. The results show that the optimal exergetic efficiency strategy generated the highest emissions reduction. The operation with the highest average ratio between heat and power loads presented the best reduction of CO2 emissions, around 13%. Minimising the running cost reduced CO2 emissions in 11.7% for the highest average heat and power ratio demand whereas for the lowest ratio the emissions increased 24.3%.INDERSCIENCE ENTERPRISES LTD, 2008, INTERNATIONAL JOURNAL OF EXERGY, 5(3) (3), 296 - 308, English[Refereed]Scientific journal
- Dec. 2007, Trans. of the Japan Societies of Refrigerating and Air Conditioning Engineers, Vol. 24, No. 4, pp. 87-98, Japanese実用プレート熱交換器内空気-水二相流の流動特性に関する研究 -単流路内流動特性と多流路分岐-[Refereed]Scientific journal
- Effect of Gravity on Pool Boiling Heat Transfer on Thermal Spray CoatingThis study deals with heat transfer enhancement surface manufactured by thermal spraying. Two thermal spraying methods using copper as a coating material, wire flame spraying (WFS) and vacuum plasma spraying (VPS), were applied to the outside of copper cylinder with 20 mm OD. The surface structure by WFS was denser than that by VPS. The effect of gravity on boiling heat transfer coeffcient and wall superheat at the onset of boiling were experimentally evaluated under micro-and hyper-gravity condition during a parabolic trajectory flight of an airplane. Pool boiling experiments in saturated liquid of HCFC123 were carried out for heat fluxes between 1.0 and 160 kW/m(2) and saturated temperature of 30 degrees C. As a result, the surface by VPS produced higher heat transfer coefficient and lower superheat at the onset of boiling under microgravity. For the smooth surface, the effect of gravity on boiling heat transfer coefficient was a little. For the coating, a large difference in heat transfer coefficient to gravity was observed in the moderate heat flux range. The heat transfer coefficinet decreased as gravity changed from the normal to hypergravity, and was improved as gravity changed from the hyperto microgravity. The difference in heat transfer coefficient between the normal and microgravity was a little. Heat transfer enhancement factor was kept over the experimental range of heat flux. It can be said that boiling behavior on thermal spray coating might be influenced by flow convection velocity.SPRINGER, Oct. 2007, MICROGRAVITY SCIENCE AND TECHNOLOGY, 19(3-4) (3-4), 90 - 92, English[Refereed]Scientific journal
- Void Fraction Characteristics of Gas-Liquid Two-Phase Flow in Circular Tubes of Various Diameters from 2 to 10 MMThe void fraction of gas-liquid two-phase flow in mini channels was measured by neutron radiography. The cross sectional averaged void fraction results were compared with the drift flux models based on the flow patterns predicted by the Mishima-Ishii's flow pattern transition criteria. The drift flux model by Ishii predicted well the experimental results for relatively large diameter tubes. In small diameter tubes, the void fraction was predicted by Ishii's model except for the annular flow region with alpha < 0.8. From these results, a new flow regime transition of churn to annular flow with α = 0.8 was proposed. The void fraction in annular flow region with α <0.8 was predicted well by Ishii's drift flux model. The drift flux model by Mishima-Hibiki predicted the void fraction results for various diameter tubes except large void fraction in annular flow region.The Japan Society of Mechanical Engineers, Apr. 2007, 15th International Conference on Nuclear Engineering (ICONE15), on CD-ROM(15) (15), "ICONE1510517 - 1"-"ICONE1510517-7", English[Refereed]Scientific journal
- Kobe University, Mar. 2007, Mem Grad Sch Sci Technol Kobe Univ, 25(25-A) (25-A), 1-6 - 6, EnglishEffect of Different Objectives Optimizations on a CHP System's Emissions of CO2
- Two-phase flows are observed in many industrial machines. Visualization and measurement of two-phase flows in real parts of the machines in the real conditions are important to understand the two-phase flow phenomena in the machines from mechanical engineering points of view. Most machines are made of metal, and optical visualization and measurement of two-phase flows in the machines are often difficult. Neutron radiography is suitable for visualization and the void fraction measurement. Neutron radiography was applied to the two-phase flows in the metallic parts of real and simulated machines. Two-phase flow behavior in a simulated tight lattice rod bundle of a nuclear reactor, a plate heat exchanger, a self-vibrating heat pipe, a fuel injection nozzle for a Diesel engine, and a polymer electrolyte fuel cell (PEFC) are presented.2007, Multiphase Science and Technology, 19(3) (3), 287 - 303, English[Refereed]Scientific journal
- Visualization and measurement of dynamic water behavior in PEFC by neutron radiographyHydrogen gas and air are supplied in saturated moist condition to keep a membrane wet in a PEFC. Condensation may occur in the cathode by the FC reaction, since air is saturated moist condition. The condensed water may affect on the fuel cell performance. It is very important for the design to know the water behaviors. In this study, in-situ visualization of an operating PEFC was carried by neutron radiography with the cell voltage measurements. A JARI standard cell was improved for the visualization with the same performance. Water distribution in the fuel cell could be quantitatively measured from visualized images via some image processing methods. The relationships between the water distributions and cell voltage fluctuations were clearly shown from the visualization and measurement results. The difference in water distribution for three types of gas supply channel was clearly shown.AMER SOC MECHANICAL ENGINEERS, 2007, PROCEEDINGS OF THE ASME/JSME THERMAL ENGINEERING SUMMER HEAT TRANSFER CONFERENCE 2007, VOL 2, No.32966, 93 - 99, English[Refereed]International conference proceedings
- Visualization and Measurement of Hygroscopic Water Distribution in a Unit Cell of Silica-Gel Adsorber by Neutron RadiographyEvaluation or hygroscopic water distribution in adsorber is important to design adsorption refrigerating system, because the adsorption and desorption process strongly affect on the cycle performance. A neutron radiography method was applied to a diagnosis of a silica-gel adsorber, such as nondestructive testing of the structure of particle layer and real-time measurement of hygroscopic water distributions. Silica gel particles of diameter around 0.5 mm were used. The attenuation coefficient of neutron beam for the silica gel particle layer was measured using a sample rectangular capsule. Then, a silica-gel unit was made by filling the silica-gel particles between fins on the outside of an aluminum cylinder. The particles were fixed with vinyl acetate glue. The internal structure of the unit was successfully visualized with the spatial resolution of 107 mu m. From the visualized images, 3-D structure of the unit was clearly obtained by a computed tomography method. From the comparison between dry and wet condition, hygroscopic water distribution could be measured. Moreover, radial distribution could be obtained by Abel transform assuming the axial symmetry.SOC CHEMICAL ENG JAPAN, 2007, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 40(13) (13), 1292 - 1297, English[Refereed]Scientific journal
- Visualization and measurement of dynamic water behavior in polymer electrolyte fuel cell by neutron radiographyVisualization of water behavior in a polymer electrolyte fuel cell was conducted by neutron radiography. Real-time video images and high-resolution still images were photographed with measurement of fuel cell generation performance. It was clearly visualized by real time imaging that water condensed in an air supply line was coming into a fuel cell. In this case the cell voltage decreased when water flowed into the cathode side. On the other hand, no effect of condensed water into the anode side was observed on the cell performance. In the results of high intensity still imaging, water amount in gas diffusion layer (GDL) under ribs and channel part with GDL were measured quantitatively. The oxygen utilization was varied while PEFC was in a constant current operation. Water amount in the GDL under ribs increased, and cell voltage decreased with increasing oxygen utilization. It can be said that water amount in the PEFC might strongly depend on airflow rate, and the cell voltage might be affected by the water amount.ZHEJIANG UNIV PRESS, 2007, CHALLENGES OF POWER ENGINEERING AND ENVIRONMENT, VOLS 1 AND 2, pp. 972-977, 972 - 977, English[Refereed]International conference proceedings
- Study on the effect of a cogeneration system capacity on its CO2 emissionsWith the global warming problem aggravation and subsequent application of the Kyoto Protocol, CO2 emissions are becoming an important factor to regard when verifying the applicability of cogeneration systems. Considering that, the purpose of this work is to study the influence a cogeneration system capacity has on its CO2 emissions under two kinds of operation strategies: one focused on exergetic efficiency and another on running cost. The system meets the demand pattern typical of a hospital in Japan, operating during one year with an average heat-to-power ratio of 1.3. The main equipments of the cogeneration system are: a gas turbine with waste heat boiler, a main boiler and an auxiliary steam turbine. Each of these equipments was characterized with partial load models and the turbines' efficiencies at full load also changed according to the system's capacity. Still, it was assumed that eventual surplus of electricity generated can be sold. The main results show that for any of the capacities simulated, an exergetic efficiency focused operational strategy always resulted on higher CO2 emissions reduction than a running cost focused one. Furthermore, the amount of reduction in emissions decreased when the system capacity decreased, reaching a value of 1.6% when the system's capacity was 33% of the maximum electricity's demand with a heat-to-power ratio of 4.1. When the system operated focused on running cost, the economic savings increased with the capacity and reached 42% for a system capacity of 80% of maximum electricity's demand and with a heat-to-power ratio of 2.3. In such conditions however, there was an increase in emissions of 8.5%. Still for the same capacity, an exergetic efficiency operation strategy presented the best balance between cost and emissions, generating economic savings of 29% with a decrease in CO2 emissions of 7.1%. The results found show the importance of an exergy focused operational strategy and also indicated that lower capacities resulted in lesser gains on both CO2 emissions and running cost savings.ZHEJIANG UNIV PRESS, 2007, CHALLENGES OF POWER ENGINEERING AND ENVIRONMENT, VOLS 1 AND 2, pp. 722-726, 722 - 726, English[Refereed]International conference proceedings
- Heat transfer characteristics of boiling two-phase flow in a plate heat exchangerThis study deals with the effect of flow direction, vertically upward and downward, on the boiling heat transfer performance in a single channel commercial heat exchanger. HCFC 123 was used as the working fluid, and was heated by hot water from the both sides. From the experimental results for inlet subcooling condition (Delta T-subin=13K) and inlet saturated liquid condition, it was shown that heat transfer coefficient of downward flow was higher than that of upward flow. On the other hand, in the case that the inlet flow was gas-liquid mixture condition (x=0.05), the effect of the flow direction was little. On the assumption that flow behaviors of gas-liquid two-phase flow strongly affects on heat and flow characteristics, air-water adiabatic two-phase flows in the same single channel commercial plate heat exchanger were visualized by neutron radiography. It was shown from the results that flow pattern of vertically upward flow was quite different from that of downward flow, especially at low liquid volumetric flux. Void fraction at the center was higher for upward flow, and was lower for downward flow. In spite of the difference in the flow pattern, there was little difference in the average void fraction. It can be said that the difference in flow pattern led to the difference in heat transfer performance.ZHEJIANG UNIV PRESS, 2007, CHALLENGES OF POWER ENGINEERING AND ENVIRONMENT, VOLS 1 AND 2, pp. 455-461, 455 - 461, English[Refereed]International conference proceedings
- Development of a new cogeneration system for local communityIn order for economically viable distributed generation systems for local community to spread, it is essential to develop an efficient and low-cost heat supply system. We propose a new heat supply system presented at the ICOPE-05 Chicago. The key technology for the system is to connect compact heat supply units installed in all the households of the local community, such as a condominium, by a single loop of hot water piping. Phase change material was used for a heat supply unit as heat storage material. However to improve handling ability and to reduce the cost down of the unit, we have developed a new heat supply unit whose heat storage tank is made of plastic. Hot water for space heating is used as heat storage material. Furthermore, we constructed a heat supply system for 7 lived-in households with a 5 kW gas engine and a 42 kW boiler as heat sources. Some experiments for a heat supply unit and a heat supply system and dynamic simulations for heat demand have been conducted, such as heat storage and supply of the heat supply unit, and COP evaluation of a new CO2 heat pump system using low-temperature exhaust from the cogeneration system.ZHEJIANG UNIV PRESS, 2007, CHALLENGES OF POWER ENGINEERING AND ENVIRONMENT, VOLS 1 AND 2, pp. 111-116, 111 - +, English[Refereed]International conference proceedings
- Dec. 2006, 「中性子ラジオグラフィ」専門研究会報告書, pp. 142-154, Japaneseシリカゲルの吸着ユニットの可視化International conference proceedings
- Aug. 2006, Proc. of the 13th International Heat Transfer Conference on CD-rom, BOI-50, EnglishBoiling Heat Transfer Enhancement by Spray Coating Surface (Effect of gravity on pool boiling heat transfer)[Refereed]Scientific journal
- Jun. 2006, Proc. of the 4th Int. Energy Conversion Engineering Conf., EnglishOptimization of a Cogeneration System Operation Strategy-fuel/ Electricity Cost Relation Study[Refereed]Scientific journal
- 日本混相流学会, Apr. 2006, Progress in Multiphase Flow Research I, 103-109(1) (1), 103 - 109, JapaneseA Study on Nucleate Boiling Heat Transfer Enhancement by Thermal Spray Coating (Results of Pool Boiling Experiments under Microgravity)[Refereed]Scientific journal
- 日本マイクログラビティ応用学会, Apr. 2006, Journal of the Japan Society of Microgravity Application, 23, 2, 88-92(2) (2), 88 - 92, JapaneseEffect of Gravity on Pool Boiling Heat Transfer around a Horizontal Cylinder (Evaluation of Heat Transfer Enhancement by Thermal Spraying)[Refereed]Scientific journal
- Apr. 2006, Progress in Multiphase Flow Research I, 119-126, JapaneseFlow Characteristics of Gas-Liquid Two-Phase Flow in a Plate Heat Exchanger (Visualization of downward flow in a commercial product by neutron radiography)[Refereed]Scientific journal
- The two-phase flow thermal control system, using latent heat of the internal fluid, has received a great deal of research interest as a method for heat removal on the space station and the Space Solar Power System (SSPS). The system has a much lower weight than the single-phase flow, and the temperature can be accurately controlled by changing the saturated pressure inside the loop. To date, this system has not been put into practical use. Numerical analyses were therefore used to investigate the dynamic responses of the loop and to investigate the operational characteristics of the thermal control system. A simulation model was constructed, and the results of the numerical analysis were compared with the experimental results. Good agreement was obtained between analytical and experimental results. © 2005 Wiley Periodicals, Inc.Dec. 2005, Heat Transfer - Asian Research, 34(8) (8), 564 - 578, English[Refereed]Scientific journal
- Sep. 2005, Proc. 4th World Congress on Industrial Process Tomography, 452-455, 452 - 455, EnglishNeutron CT for Two-phase Flow Measurement[Refereed]International conference proceedings
- Jul. 2005, Trans. of the Japan Society of Mechanical Engineers, 71,,707, 1870-1877, Japanese潜熱蓄熱を利用した熱供給ユニットに関する研究(プレートフィン型熱交換器を利用した蓄熱器の動特性予測)[Refereed]Scientific journal
- It is important for the design of an adsorption heat exchanger used in an adsorption refrigerator to know the hygroscopic water distribution in the adsorbent bed with cooling or heating, because the adsorption/dehydration process is a complicated phenomenon with heat conduction, vapor diffusion, and vapor flows in the particle bed, and it is a dominant factor on the performance. A neutron radiography method was applied to measure the hygroscopic water distribution in an adsorption bed. In this study, a transient phenomenon in a dehydration process was investigated. Silica gel particles whose component is 99.8% silicone dioxide and diameter is around 0.5 mm are used as an adsorbent, and they are packed in an aluminum cylinder with a 36 mm inner diameter and 100 mm depth. From the radiographs, the transient characteristics of the hygroscopic water distributions were clearly visualized via some image processing methods. (c) 2005 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Apr. 2005, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 542(1-3) (1-3), 241 - 247, English[Refereed]Scientific journal
- Adiabatic vertically downward air-water two-phase flows in a commercial plate heat exchanger were visualized by a neutron radiography method as a non-destructive test in order to clarify the flow characteristics and the differences of the liquid distributions from those of the vertically upward flows. Flow behaviors in a single channel and a multi-channel plate heat exchanger were investigated. From the visualized results of the flows in a single channel, it was shown that water fell down without a spreading at a lower gas volumetric flux of less than about 2 m/s. In the case of a higher gas volumetric flux above 2 m/s, liquid spread around the enlarged section and the liquid distribution in the main part of the heat exchanger seemed to be homogenous. Measured average void fractions for the air-water downward flows showed almost the same tendency as those for the upward flows in spite of the difference of the flow patterns. On the other hand, liquid distributions into 18 parallel channels were evaluated from the measured results of the liquid volumetric fractions in each channel. It was shown that the liquid distribution depended on the inlet liquid flow rate. However, the effect of the gas flow rate was a little. In the case of higher liquid flow rate, the liquid fraction became higher with a deeper channel due to a larger liquid momentum. However, in the case of a lower liquid flow rate, the opposite tendency was observed, i.e., the liquid fraction in the nearest channel to the inlet was higher. (c) 2005 Published by Elsevier B.V.ELSEVIER SCIENCE BV, Apr. 2005, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 542(1-3) (1-3), 154 - 160, English[Refereed]Scientific journal
- A quantitative void fraction measurement method based on the umbra method using a neutron absorber grid was applied to the void fraction measurement of two-phase flow in a rod bundle. The grid 3 mm in width and 3 mm in interval was made from W. The two-phase flow direction was vertical and the grid was placed vertically between the rod bundle and the neutron source. A cooled-CCD camera in the JRR-3 M thermal neutron radiography system was used. CT reconstruction was carried out for 60 horizontal slices with a vertical interval of 3 mm. Subchannel void fraction distributions were also calculated. The quantitative measurement with spatial resolution 0.1 mm, size of the image element, horizontally and 3 mm vertically was carried out. (c) 2005 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, Apr. 2005, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 542(1-3) (1-3), 387 - 391, English[Refereed]Scientific journal
- Mar. 2005, 日本機械学会論文集B編, 71・703・908-913, Japanese潜熱利用流体排熱システムにおける蒸気弁操作による温度制御[Refereed]Scientific journal
- In order for economically viable distributed generation systems for local community to spread, it is essential to develop an efficient and low-cost heat supply system. We propose a new heat supply system called DREAMS (Distributed Residential Energy with Advanced Management System). The key technology for the system is to connect compact heat supply units installed in all the households of the local community, such as a condominium, by a single loop of hot water piping. A short time heat demand, such as hot water supply to a bath tab, can be covered by the heat storage. A prototype of heat supply unit with a practical capacity was designed based on the new conception. The unit is a hybrid heat storage unit, that is, heat can be stored in the thermal stratification of water and in a PCM (phase change material) layer on the side wall of the water tank. A paraffin wax with a melting point of 71.5℃ was used as the PCM. In this paper, experimental results on the dynamic characteristics of the heat storage unit in heat storage and release process are presented.The Japan Society of Mechanical Engineers, 2005, The proceedings of the JSME annual meeting, 2005, 169 - 170, Japanese
- A two-phase flow thermal control system, which utilizes the latent heat of fluid, is paid attention to for the heat removal in the space station and the Space Solar Power System (SSPS). The characteristics are that the system weight is lower than that in single-phase flow and that the temperature can be controlled by changing the pressure of the loop. Conventionally, the control of the temperature in a loop has been performed by operating the pressure of the accumulator. In this paper, the temperature control of the loop by the vapor valve is proposed as a new control method. For the proposal of new control method, an active thermal control system which can give a maximum l kW heat load to an evaporator was built and an experiment of the dynamic characteristics under l G was carried out in the extensive quality range with a partial heat load, using alternative freon HCFC-123 as the working fluid. As a result, the effects of the vapor valve opening on the dynamic response and the possibility of the loop control by the vapor valve were clarified.Japan Society of Mechanical Engineers, 2005, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 71(703) (703), 908 - 913, Japanese[Refereed]Scientific journal
- It is necessary to develop an effective technology used of the waste energy exhausted at the same time as generation of electric power for popularizing the distributed power supply system, for example, Micro Gas Turbine System, or Fuel Cell System. The thermal storage function is more indispensable for a highly effective operating of distributed system because the demand fluctuation of heat is very large than electricity. In this study, two kinds of the plate fin heat exchanger enclosed the phase change material (PCM) were used as the compact thermal storage unit. Two kinds of PCM (Phase Change Material) were used, which are Sodium acetate trihydrate with a melting point of about 58 C and Paraffin wax with a melting point of about 74.8 C. Here, we made comparison with experimental value and calculated value by the developed numerical simulation for dynamic characteristics in heat charging and discharging of small thermal storage unit. As a result, it was shown that an analytical method in which the latent heat of PCM was considered with total specific heat was effecitve as the numerical analysis model.Japan Society of Mechanical Engineers, 2005, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 71(707) (707), 1870 - 1877, JapaneseScientific journal
- Kobe University, 2005, 神戸大学大学院自然科学研究科紀要, 23-B, pp.101-107, 101 - 107, Japaneseプレートフィン型熱交換器を利用した蓄熱器の動特性予測[Refereed]Scientific journal
- 2005, Neutron Radiography (7),Edited by P.Chirico and R.Rosa, pp.479-486, EnglishMeasurement Uncertainly of Gas Liquid Two-Phase Flow by Neutron RadiographyScientific journal
- 2005, Proc. 5th Int. conf.on Multiphase Flow on CD-ROM, Paper №172, EnglishAdiabatic Gas-Liquid Two-Phase Flow Characteristics in a Commercial Plate Heat Exchanger[Refereed]International conference proceedings
- A high efficient co-generation system named "Neighboring Communities Co-generation System" is proposed to a multiple dwelling house. The key technology of this system is to connect home and home with one loop of heat transfer line of one inch diameter, and to level the heat demand by a heat storage unit in each house. This system requires compact heat storage unit of quick response. In this study, a plate fin type, brazing heat exchanger was built and tested as a heat storage unit. Sodium acetate trihydrate with a melting point of about 58°C and paraffin wax with a higher value of 74.8°C were used as the phase change material (PCM). As a result, it was shown that the heat transfer in the heat storage unit was dominated by thermal conductivity in PCM. Paraffin wax showed higher responsibility and higher heat output due to its higher melting point and quite lower super cooling in solidification.Japan Society of Mechanical Engineers, 2005, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 71(704) (704), 1126 - 1132, Japanese[Refereed]Scientific journal
- Development of single loop heat supply system for local community cogeneration - (Prototype test of a heat supply unit with heat storage and tap water preheating by heat pump unit)In order for economically viable distributed generation systems for local community to spread, it is essential to develop an efficient and low-cost heat supply system. We propose a new heat supply system called DREAMS (Distributed Residential Energy with Advanced Management System). The key technology for the system is to connect compact heat supply units installed in all the households of the local community, such as a condominium, by a single loop of hot water piping. Two methods to decrease the heat supply rate through the single loop are proposed in this paper. The one is an utilization of a compact heat supply unit with heat storage in each house. The momentary heat demand can be covered by the heat storage. The other is a tap water preheating. A new CO2 regenerative heat pump cycle was proposed for the recover of the low temperature heat from the generator. A new heat supply unit with a practical capacity was manufactured, and the heat supply performance was evaluated by some experiments. Furthermore, an advanced energy management system has been under consideration to realize the effective system operation by utilizing IT. In this paper, experimental results on the performance of the new heat supply unit, the new CO2 heat pump system and evaluation of the energy-saving effect of our DREAMS are presented.Lead, AMER SOC MECHANICAL ENGINEERS, 2005, Proceedings of the ASME Power Conference 2005, A, 1485 - 1490, English[Refereed]International conference proceedings
- A high efficient co-generation system named "Neighboring Communities Co-generation System" is proposed to a multiple dwelling house. The key technology of this system is to connect home and home with one loop of heat transfer line of one inch diameter, and to level the heat demand by a heat storage unit in each house. This system requires compact heat storage unit of quick response. In this study, a plate fin type, brazing heat exchanger was built and tested as a heat storage unit. Sodium acetate trihydrate with a melting point of about 58°C and paraffin wax with a higher value of 74.8°C were used as the phase change material (PCM). As a result, it was shown that the heat transfer in the heat storage unit was dominated by thermal conductivity in PCM. Paraffin wax showed higher responsibility and higher heat output due to its higher melting point and quite lower super cooling in solidification.Japan Society of Mechanical Engineers, 2005, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 71(704) (704), 1126 - 1132, Japanese[Refereed]Scientific journal
- Adiabatic and boiling gas-liquid two-phase flows in a simulated plate heat exchanger with a single-ribbed channel were visualized by a thermal neutron radiography method. In the experiments under adiabatic, condition, the air-water two-phase flows in an aluminum test section were visualized. In the boiling two-phase flow experiments, chlorofluorocarbon R141b was used as the working fluid. Two-dimensional distributions of void fraction were measured from visualized images via some image processing techniques. As a result, it was shown that both the phases tended to flow straight in the ribbed channel, and mixing of gas and liquid phases was weak. Moreover, when working fluids flew into the test section as a gas-liquid mixture, the phase distributions were strongly affected by a liquid pool at the test section inlet. (C) 2004 Elsevier Ltd. All rights reserved.PERGAMON-ELSEVIER SCIENCE LTD, Oct. 2004, APPLIED RADIATION AND ISOTOPES, 61(4) (4), 707 - 713, English[Refereed]Scientific journal
- Flow visualization and measurement of cross-sectional liquid distribution is very effective to clarify the effects of obstacles in a conduit on heat transfer and flow characteristics of gas-liquid two-phase flow. In this study, two methods to obtain cross-sectional distribution of void fraction are applied to vertical upward air-water two-phase flow. These methods need projection image only from one direction. Radial distributions of void fraction in a circular tube and a circular-tube annuli with a spacer were calculated by Abel transform based on the assumption of axial symmetry. On the other hand, cross-sectional distributions of void fraction in a circular tube with a wire coil whose conduit configuration rotates about the tube central axis periodically were measured by CT method based on the assumption that the relative distributions of liquid phase against the wire were kept along the flow direction. (C) 2004 Elsevier Ltd. All rights reserved.PERGAMON-ELSEVIER SCIENCE LTD, Oct. 2004, APPLIED RADIATION AND ISOTOPES, 61(4) (4), 625 - 630, English[Refereed]Scientific journal
- Feb. 2004, 日本機械学会論文集B編, 70・690・425-431, Japanese潜熱利用流体ループ式熱制御システムの動特性に関する研究[Refereed]Scientific journal
- In order to clarify the gas-liquid two-phase flow characteristics in a plate heat exchanger, gas-liquid two-phase flows in simulated heat exchangers with a single channel placed in a vertical plane were visualized by a neutron radiography method. Adiabatic air-water two-phase flows and R 141 b boiling two-phase flows were visualized, and two-dimensional void fraction distributions were measured from visualized images via some image processing techniques. Moreover, total pressure loss of adiabatic airwater two-phase flows through the test section was measured, and the frictional pressure loss was calculated by using measured results of average void fraction. As a result, it was shown that the phase distributions in heat exchangers were strongly affected by the inlet configuration and the inlet conditions. In the case that the incoming flow was a gas-liquid two-phase flow, stagnant liquid at the test section inlet caused unsymmetrical phase distribution. For high gas volumetric flux, both phases tended to flow straight separately and liquid mixing in the channel with ribs was a little. It was also shows that the average void fractions and the frictional pressure loss of adiabatic air-water two-phase flows in the channel with ribs could be correlated by the drift-flux model and the L-M method, respectively.Japan Society of Mechanical Engineers, 2004, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 70(700) (700), 3136 - 3141, Japanese[Refereed]Scientific journal
- A two-phase flow thermal control system, which utilizes the latent heat of fluid, is paid attention to for the heat removal in the space station and the Space Solar Power System (SSPS). The characteristics are that the system weight is lower than that in single-phase flow and that the temperature can be controlled by changing the saturated pressure of the loop. The control technology of the system has not been put into practical use. It is very effective to estimate the dynamic response of the loop by the numerical analysis as a means to establish the control technology of the thermal control system utilizing latent heat. The simulation model of the system was constructed, and the results of the numerical analyses were compared with the experiment results. A good agreement between analytical and experimental results was obtained.Japan Society of Mechanical Engineers, 2004, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 70(699) (699), 2928 - 2934, Japanese[Refereed]Scientific journal
- A two-phase flow themal control system, which utilizes the latent heat of fluid, is paid attention to for the heat removal in the space station and the Space Solar Power System (SSPS). The characteristcs are that the system weight is lower than that in single-phase flow and that the temperature can be controlled by changing the pressure of the accumulator. An active thermal control system which can give a maximum l kW heat load to an evaporatotr was built and an experiment on the dynamic characteristics under l G were carried out in the extensive quality range with a partial heat load, using alternative freon HCFC-123 as the working fluid. As a result, the effects of the operating quantities such as the heat input and the puressure in the accumulator on the dynamic response are clarified. It is shown that the effect of the operating condition on the time constant of the evaporator is correlated with the quality.Japan Society of Mechanical Engineers, 2004, Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 70(690) (690), 425 - 431, Japanese[Refereed]Scientific journal
- 神戸大学, 2004, 神戸大学大学院自然科学研究科紀要, 22-B,59-66, 59 - 66, Japanese分岐管における気液二相流の流動特性に関する研究[Refereed]Scientific journal
- 潜熱利用流体ループ式排熱システムの動特性解析と実験結果の比較A two-phase flow thermal control system, which utilizes the latent heat of fluid, is paid attention to for the heat removal in the space station and the Space Solar Power System (SSPS). The characteristics are that the system weight is lower than that in single-phase flow and that the temperature can be controlled by changing the saturated pressure of the loop. The control technology of the system has not been put into practical use. It is very effective to estimate the dynamic response of the loop by the numerical analysis as a means to establish the control technology of the thermal control system utilizing latent heat. The simulation model of the system was constructed, and the results of the numerical analyses were compared with the experiment results. A good agreement between analytical and experimental results was obtained.The Japan Society of Mechanical Engineers, 2004, 日本機械学会論文集（Ｂ編）, 70(699),2928-2934(699) (699), 2928 - 2934, Japanese[Refereed]Scientific journal
- 2004, 日本機械学会論文集（B編）, 70(690),425-431, Japanese潜熱利用流体ループ式熱制御システムの動特性に関する研究[Refereed]Scientific journal
- 2004, 日本機械学会論文集（Ｂ編）, 70(700),3136-3141, Japaneseプレート熱交換器内気液二相流の流動特性に関する研究（単一流路内の流動挙動の可視化及びボイド率分布の計測）[Refereed]Scientific journal
- 2004, Proc.of the 1st Int. Forum on Heat Transfer, GS6-12 on CD-ROM, EnglishNucleate Boiling Heat Transfer Enhancement by Micro Structure by Thermal SprayingInternational conference proceedings
- Kobe University, 2004, Memoirs of Graduate School of Scinece and Technology Kobe University., 22-A,123-142, 123 - 142, EnglishHAT and MAT Cycle for Power Augmentation of Gas Turbine Power Plants.[Refereed]Scientific journal
- In order to clarify the gas-liquid two-phase flow characteristics in a plate heat exchanger, gas-liquid two-phase flows in simulated heat exchangers with a single channel placed in a vertical, plane were visualized by a neutron radiography method. Air-water adiabatic two-phase flows and chlorofluorocarbon R141b boiling two-phase flows were visualized, and two-dimensional void fraction distributions were measured from visualized images via some image processing techniques. Moreover, total pressure loss of adiabatic air-water two-phase flows through the test section was measured, and the frictional pressure loss was calculated by using measured results of average void fraction. As a result, it was shown that the phase distributions in heat exchangers were strongly affected by the inlet configuration and the inlet conditions. When the incoming flow was a gas-liquid two-phase flow, liquid stagnation at the test section inlet caused unsymmetrical phase distribution. For high gas volumetric flux, both phases-tended to flow straight separately. Moreover, it was shown that the average void fractions and the frictional pressure loss of adiabatic air-water two-phase flows in the ribbed channel could be correlated by the drift-flux model and the L-M method, respectively. (C) 2003 Elsevier Inc. All rights reserved.ELSEVIER SCIENCE INC, Jan. 2004, EXPERIMENTAL THERMAL AND FLUID SCIENCE, 28(2-3) (2-3), 223 - 230, English[Refereed]Scientific journal
- 2004, Thermal Science and Engineering, 12, 49, 97-98, EnglishDevelopment of Heat Supply Unit Using Phase Change Materials fo the Neighboring Communities Co-generation SystemScientific journal
- A novel power generation cycle is proposed in this paper taking hydrogen as fuel and using steam generated by hydrogen firing as working fluid. The progress of the development work and side issues such as the application of hydrogen combustion turbines to environmentally clean fossil fuel power plants for early commercialisation of the system are reviewed. We propose the hydrogen-fired Rankine cycle as similar to (C) type developed earlier by Hisadome et al. and Sugishita et al. and then making a new design of it by increasing the performance characteristics and efficiencies with (reheating, regenerative and recuperation) of the working fluid of the bottoming cycle respectively, and in this case we present two types (C1 and C2). In the case of type C2 the cycle is called the ‘New Rankine Cycle’. These cycles are also compared with the Rankine cycle of type (C) for hydrogen-fired to show the advantages of the performance characteristics of the new design at which the highest value of exergetic efficiency reaches 63.58% as HHV at 1700oC of the combustor discharge temperature. These cycles are analysed through thermodynamics, particularly by exergy analysis, and the performance characteristics of the cycles are also studied. © 2004 Inderscience Enterprises Ltd.2004, International Journal of Exergy, 1(1) (1), 29 - 46, English[Refereed]Scientific journal
- 2004, Proc. Japan-US Seminar on Two-Phase Flow Dynamics, 1,,207-215, EnglishAdiabatic Gas-Liquid Two-Phase Flow Characteristics in a Plate Heat Exchanger[Refereed]International conference proceedings
- A study of the flow characteristics in air-water two-phase flow under microgravity (Results of flight experiments)Reliable design of space thermal management systems requires a through understanding of the hydrodynamic characteristics of two-phase flow influenced by the change in gravity. The data of flow patterns, void fraction, frictional pressure drop associated with its characteristics were obtained at normal gravity and in microgravity and hyper-gravity (2g) conditions aboard MU-300 aircraft capable of parabolic trajectory flying. Some experiments were performed for an air-water two-phase flow through 10 mm diameter adiabatic test section with 600 mm length of transparent acrylic resin horizontal tube. The results obtained at three gravity levels (mug, 1g and 2g) are compared with some of the existing flow pattern transition, void fraction and frictional pressure drop models and correlations. The gravity dependency of flow patterns was more clearly appeared with the decrease in gas and liquid flow rates. The effect of gravity on two-phase flow was insignificant for the turbulent flow regions.JAPAN SOC MECHANICAL ENGINEERS, May 2003, JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, 46(2) (2), 262 - 269, English[Refereed]Scientific journal
- Microgravity Two-Phase Flow Characteristics in Adiabatic PipesMore reliable design of thermal transport, power acquisition and thermal control/management systems for space use requires a through understanding of the flow hydrodynamic, the differences and similarities between the two-phase flow characteristics of two-phase flow influenced by the change in gravity. The data of flow patterns, void fraction, frictional pressure drop associated with its characteristics were obtained at normal gravity and in microgravity and hyper-gravity (2g) conditions aboard MU-300 aircraft capable of parabolic trajectory flying. Some experiments were performed for an air-water two-phase flow through 10mm diameter adiabatic test section with 600mm length of transparent acrylic resin horizontal tube. The obtained experimental data covered a range of liquid and gas flow rates with the liquid superficial velocity ranging from 0.095m/s to 2.56m/s, and the gas superficial velocity ranging from 0.032m/s to 21.08m/s. The results obtained at three gravity levels (μg, 1g and 2g) are compared with some of the existing models and correlations. Flow pattern results obtained under μg, 1g and 2g conditions were compared with void fraction based flow pattern transition models developed by Bousman (1995). In the comparisons of the microgravity void fraction results with the correlation proposed by Inoue-Aoki (1970), it was found that the micorgravity void fraction was greater than the model as 42% for bubbly flow region. Two-phase frictional pressure drops obtained under three g-levels were compared with each other, and it also showed that frictional pressure drop were well fitted with the Lockhart-Martinelli-Chisholm model. As results, the gravity dependency of flow patterns was more clearly appeared with the decrease in gas and liquid flow rates. The effect of gravity on two-phase flow frictional pressure drop was insignificant for the turbulent flow regions.日本機械学会, Mar. 2003, The 6th ASME*3-JSME*1 Thermal Engineering Joint Conference, 2003(6) (6), 158 - 158, English[Refereed]Scientific journal
- A Study of High Performance Gas-Liquid Phase Separator by Utilizing Y-junction under Microgravity ConditionGas and liquid phases are easily separated owing to buoyancy on the ground. However, in space (i.e. under micro-gravity condition), the method cannot be adopted. In this study, a method of a Y-junction by using the difference of inertia force between gas and liquid phases is proposed for a first-step and rough separation. Experiments of phase separation in a horizontally placed impacting Y-junction were carried out under both normal and micro-gravity conditions. Phase separations in Y-junction for two-component and one-component two-phase flow were also examined. As a result, it was shown that the liquid could be extracted effectively from the two-phase flow by using a Y-junction under micro-gravity. The effect of inlet flow pattern of gas-liquid flow on phase separation performance was discussed.日本機械学会, Mar. 2003, Proceedings of the 6th ASME-JSME Thermal Engineering Joint Conference on CD-Rom, B4-180(6) (6), 157 - 157, English[Refereed]International conference proceedings
- Simulation and Optimization of Districted Energy Supply System Based on Exergy.Two distributed energy supply systems with different generation efficiency were evaluated based on exergy analysis and optimized on the running cost for a few patterns of energy demand. One of the systems uses a gas turbine with generation efficiency of 30%. Saturated steam is generated in a waste heat boiler, and is used for hot water and heating, and moreover for cooling. On the other hand, another system uses a SOFC and a micro gas turbine combined system as high efficient power generator with the generation efficiency of 50%. A shortage of electric power is made up by buying from an electric power company, and a gas boiler and a refrigerator with an electrically-driven turbo compressor are also used to make up for a shortage of heating and cooling demand, respectively. As a result, the relation between the operating cost and the exergy efficiency had been clearly shown. If a gas boiler is used for heating demand, the exergy efficiency of energy supply system decreases due to low exergy efficiency of gas boiler, in spite of the higher thermal efficiency. In order to increase exergy efficiency of system, heating demand should be covered by a waste heat from generators. Moreover, operating cost reduction could be compatible with the increase of exergy efficiency of system by selling surplus power.The Japan Society of Mechanical Engineers, 2003, Proceedings of the International Conference on Power Engineering(ICOPE-03), 1,43-48(1) (1), "1 - 43"-"1-48", English[Refereed]International conference proceedings
- 2003, Proc. 3rd European-Japan Two-phase Flow Meet., 未記入, EnglishQuantitative void fraction measurement method by neutron radiography and some applications.International conference proceedings
- 2003, Proceedings of the 1st International Exergy, Energy and Environment Symposium., 89, EnglishNew Rankine Cycle for Hydrogen-Fired Power Generation Plants.[Refereed]International conference proceedings
- 2003, DKV-Tagungsbericht, pp. 207-220, GermanNeue Hochleistungsoberflaechen fuer Kaeltemittelverdampferrohre[Refereed]International conference proceedings
- Microgravity Two-Phase Flow Characteristics in Adiabatic pipesMore reliable design of thermal transport, power acquisition and thermal control/management systems for space use requires a through understanding of the flow hydrodynamic, the differences and similarities between the two-phase flow characteristics of two-phase flow influenced by the change in gravity. The data of flow patterns, void fraction, frictional pressure drop associated with its characteristics were obtained at normal gravity and in microgravity and hyper-gravity (2g) conditions aboard MU-300 aircraft capable of parabolic trajectory flying. Some experiments were performed for an air-water two-phase flow through 10mm diameter adiabatic test section with 600mm length of transparent acrylic resin horizontal tube. The obtained experimental data covered a range of liquid and gas flow rates with the liquid superficial velocity ranging from 0.095m/s to 2.56m/s, and the gas superficial velocity ranging from 0.032m/s to 21.08m/s. The results obtained at three gravity levels (μg, 1g and 2g) are compared with some of the existing models and correlations. Flow pattern results obtained under μg, 1g and 2g conditions were compared with void fraction based flow pattern transition models developed by Bousman (1995). In the comparisons of the microgravity void fraction results with the correlation proposed by Inoue-Aoki (1970), it was found that the micorgravity void fraction was greater than the model as 42% for bubbly flow region. Two-phase frictional pressure drops obtained under three g-levels were compared with each other, and it also showed that frictional pressure drop were well fitted with the Lockhart-Martinelli-Chisholm model. As results, the gravity dependency of flow patterns was more clearly appeared with the decrease in gas and liquid flow rates. The effect of gravity on two-phase flow frictional pressure drop was insignificant for the turbulent flow regions.日本機械学会, 2003, Proc. of the 8th ASME-JSME Thermal Engineering Joint Conference on CD-Rom, B4-191(6) (6), 158 - 158, EnglishInternational conference proceedings
- 2003, Proceedings of International Thermal Spray Conference(ITSC2003), 559-566, EnglishImproved Heat Transfer by RF Plasma Produced Structured Surfaces.[Refereed]International conference proceedings
- Development of the New Heat Supply Unit for the Neighboring Communities Co-generation System.The high efficient dispersed co-generation system is proposed to make our living environment, comfortable and high quality, using combined heat information and power technologies. The key technology of this system is to connect home and home with one loop of heat transfer line and to level the heat demand, using the thermal storage system, in the neighboring communities than the conventional home co-generation system. The pipe diameter of this heat transfer line is only one or two inches. The number of houses in the neighboring communities is from several dozen to several hundred. At present, the joint study of the academic, business and governmental circles have been developed to verify the control logic for leveling the heat duty of mainly hot feed-water. This paper presents the concept of this neighboring communities co-generation system compared with the ordinary heat and power supply system and also the test result of New Heat Supply Unit is described.The Japan Society of Mechanical Engineers, 2003, Proceedings of the International Conference on Power Engineering (ICOPE-03), 1,49-54(1) (1), "1 - 49"-"1-54", English[Refereed]International conference proceedings
- 2003, Proc. of the 4th International Conference on Compact Heat Exchangers and Enhancement Technology for the Process Industries., 399-406, EnglishDevelopment of Plasma Spray-Coated Tubes for Compact Evaporator.[Refereed]International conference proceedings
- A Study of Renewable Energy Hydrogen-Fired Power Generaion Plants.The world's population is expected to increase to ten billion in the 21^The Japan Society of Mechanical Engineers, 2003, Proceedings of the International Conference on Power Engineering(ICOPE-03), 3,223-228(3) (3), "3 - 223"-"3-228", English
century, accompanied by a rapid increase of energy consumption. This will bring about a shortage of fuel resources and global warming caused by CO_2 emissions. The basic solution to these problems will be to use energy resources more efficiently and to switch from fossil fuels to nuclear energy and renewable energy. On this purpose in this paper we will propose the hydrogen-fired Rankine cycle as similar to (C) type and then we will make modification of it by increasing the performance characteristics and efficiencies with (reheating, regenerative and recuperation) of the working fluid of the bottoming cycle respectively, and in this case we will present two types (C1 and C2). In case of type C2 the cycle will be called as "New Rankine Cycle". And as well these cycles will be compared with the Rankine cycle (C) for hydrogen-fired, to show the advantages of the performance characteristics of the new design which the highest value of exergy efficiency can be reached to 63.58% as HHV at 1700℃ of the combustor discharge temperature. These cycles will be analyzed by thermodynamic theory as well as for exergy analysis, and the performance characteristics of the cycles will be studied. The effects of the different parameters such as the discharge temperatures and pressures of the combustors of high and low pressure and also the effect of pressure of the condenser on the performance of the cycles will be also clarified. [Refereed]International conference proceedings - A Study of High Performance Gas-Liquid Phase Separator by Utilizing Y-junction under Microgravity ConditionGas and liquid phases are easily separated owing to buoyancy on the ground. However, in space (i.e. under micro-gravity condition), the method cannot be adopted. In this study, a method of a Y-junction by using the difference of inertia force between gas and liquid phases is proposed for a first-step and rough separation. Experiments of phase separation in a horizontally placed impacting Y-junction were carried out under both normal and micro-gravity conditions. Phase separations in Y-junction for two-component and one-component two-phase flow were also examined. As a result, it was shown that the liquid could be extracted effectively from the two-phase flow by using a Y-junction under micro-gravity. The effect of inlet flow pattern of gas-liquid flow on phase separation performance was discussed.日本機械学会, 2003, Proc. of the 6th ASME-JSME Thermal Engineering Joint Conference on CD-Rom, B4-180(6) (6), 157 - 157, EnglishInternational conference proceedings
- An experimental study has been carried out to clarify the characteristics of the void fraction and the liquid film thickness of the air-water two-phase flow in vertical tubes of 25-mm inside diameter with wire coils of varying wire diameter and pitch. The flow pattern in the experiment on the average void fraction and the local void fraction distribution in cross section was a bubble flow, and the liquid film thickness was in the region of semiannular and annular flows. It is clarified from these experiments that the average void fraction in tubes with wire coils is lower than that in a smooth tube and decreases with the wire diameter owing to the centrifugal force of the swirl flow which concentrates bubbles at the center of the tube, that the local liquid film thickness becomes more uniform with a decrease in the pitch of the wire coil, and that the liquid film becomes thicker after the passage through the wire coil with an increase in the wire diameter. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(8): 652-664, 2002 Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/htj.10067.Dec. 2002, Heat Transfer - Asian Research, 31(8) (8), 652 - 664, English[Refereed]Scientific journal
- Experiments were carried out to investigate the flow pattern, average void fraction, and pressure drop of an upward air-water two-phase flow in vertical tubes of 25-mm inside diameter with wire coils of varying wire diameter, pitch, and number of coils in cross section. Five kinds of flow patterns-bubble, slug, churn, semiannular, and annular flow-were defined based on the observation of flow behavior in the experiments. At higher water flowrates, the bubble-to-slug transition occured at lower air flowrates in tubes with wire coils than in smooth tubes. The average void fraction was found by using the drift flux model. Further, the experimental results of the friction pressure drop were compared with the Lockhart-Martinelli correlation. As a result, a correlation with the constant C in Chisholm's equation was obtained as a function of the wire coil pitch-to-diameter ratio. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(8): 639-651, 2002 Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/htj. 10066.Dec. 2002, Heat Transfer - Asian Research, 31(8) (8), 639 - 651, English[Refereed]Scientific journal
- 微小重力場における空気－水二成分二相流の流動特性に関する研究（航空機実験の結果）In order to better understand the effect of gravity on two-phase flow, the microgravity experimental tests were conducted aboard MU-300 aircraft capable of parabolic trajectory flying. They are carried out in an air-water two-phase flow through 10 mm diameter adiabatic test section, which is 600 mm lengths of transparent acrylic resin horizontal tube. The obtained experimental data covered a range of liquid and gas flow rates with the liquid superficial velocity ranging from 0.095 m/s to 2.56 m/s, and the gas superficial velocity ranging from 0.032 m/s to 21.08 m/s. Flow pattern results obtained under μg, 1 g and 2 g conditions were compared with void fraction based flow pattern transition models developed by Bousman (1995). The effects of the gravity change on flow patterns were significantly large at low gas and liquid superficial velocities. In the comparisons of the microgravity void fraction results with the correlation proposed by Inoue-Aoki (1970), it was found that the micorgravity void fraction was greater than the model as 42% for bubbly flow region. Two-phase frictional pressure drops obtained under three g-levels were compared with each other, and it was also found that frictional pressure drop were well fitted with the Lockhart-Martinelli-Chisholm model. The effect of gravity change on the pressure drops was insignificant for the turbulent flow reginos.The Japan Society of Mechanical Engineers, Aug. 2002, 日本機械学会論文集B編, 68・672・79-84(672) (672), 2247 - 2252, Japanese[Refereed]Scientific journal
- In order to investigate the flow and hydrodynamic characteristics of two-phase flow influenced by the change in gravity, tests were performed using MU-300 flight capable of producing μg and 2g conditions and on ground with the identical flow conditions and the same flow loop. The test section was a 10mm diameter and 600mm lengths, and it was also mounted horizontally to the direction of gravitational force. The ranges of superficial velocity are 0.1m/s to 2.6m/s for water, 0.03m/s to 21m/s for air, respectively. The data collected at three gravity levels (μg, 1g and 2g) were compared with the existing models and correlations, and the differences and similarities between the two-phase flow characteristics at three gravity levels were also presented.The Japan Society of Mechanical Engineers, 2002, The proceedings of the JSME annual meeting, 2002, 207 - 208, Japanese
- In order to develop a phase separation technique under microgravity condition, the method of the impacting Y-junction by utilizing the difference of inertia force between gas and liquid phases is proposed. Experiments of phase separation in an impacting Y-junction of 10 mm ID placed in a horizontal plane were carried out under normal and microgravity conditions using air or gaseous nitrogen and water as working fluids. The phase separation performance under microgravity was measured by controlling the extraction rate during the microgravity period of about 20 seconds by parabolic trajectory flight of the airplane (G II). As a result, it was shown that liquid extraction from two-phase flow was possible by using a Y-junction for every condition in the microgravity experiments. About 60% maximum of all the liquid phase could be extracted from incoming gas-liquid two-phase flow by Y-junction under microgravity in our experimental range.Japan Society of Mechanical Engineers, 2002, Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 68(673) (673), 2542 - 2547, Japanese[Refereed]Scientific journal
- In order to better understand the effect of gravity on two-phase flow, the microgravity experimental tests were conducted aboard MU-300 aircraft capable of parabolic trajectory flying. They are carried out in an air-water two-phase flow through 10 mm diameter adiabatic test section, which is 600 mm lengths of transparent acrylic resin horizontal tube. The obtained experimental data covered a range of liquid and gas flow rates with the liquid superficial velocity ranging from 0.095 m/s to 2.56 m/s, and the gas superficial velocity ranging from 0.032 m/s to 21.08 m/s. Flow pattern results obtained under μg, 1 g and 2 g conditions were compared with void fraction based flow pattern transition models developed by Bousman (1995). The effects of the gravity change on flow patterns were significantly large at low gas and liquid superficial velocities. In the comparisons of the microgravity void fraction results with the correlation proposed by Inoue-Aoki (1970), it was found that the microgravity void fraction was greater than the model as 42% for bubbly flow region. Two-phase frictional pressure drops obtained under three g-levels were compared with each other, and it was also found that frictional pressure drop were well fitted with the Lockhart-Martinelli-Chisholm model. The effect of gravity change on the pressure drops was insignificant for the turbulent flow regions.Japan Society of Mechanical Engineers, 2002, Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 68(672) (672), 2247 - 2252, Japanese[Refereed]Scientific journal
- A study of gas-liquid two-phase flow in a horizontal tube under microgravityA better understanding of the effect of gravity level on two-phase flow characteristics is crucial for designing two-phase heat transport systems and thermal control systems for space. Hence, an experiment was conducted aboard MU-300 aircraft, as well as at normal gravity using the same horizontal tube, 10mm internal diameter and flow conditions. The experimental results, obtained under Earth, hypergravity (2g), and microgravity environments were compared with previous models. Flow pattern data were compared with data from models for predicting microgravity flow pattern transitions. The mean void fraction under mug and 1g conditions was also compared with the Inoue-Aoki model for vertical upward annular flow at normal gravity. Frictional pressure drop fitted well with the Lockhart-Martinelli model, slightly influenced by the change in gravity levels (mug, 1g, and 2g); however, the effect of changing gravity on the pressure drop was insignificant for turbulent flow.NEW YORK ACAD SCIENCES, 2002, MICROGRAVITY TRANSPORT PROCESSES IN FLUID, THERMAL, BIOLOGICAL, AND MATERIALS SCIENCES, 974, 316 - 327, English[Refereed]Scientific journal
- 日本冷凍空調学会, 2002, Trans. of the Japan Society of Refrigerating and Air Conditioning Engineers, Vol. 19, No. 4, pp. 301-312.(4) (4), 301 - 312, Japanese臭化リチウム吸収式冷凍機のエクセルギー解析 -マイクロガスタービンの排気燃焼ガスで駆動する場合-[Refereed]Scientific journal
- 2002, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 68, No. 673, pp.2542-2547, JapaneseY字分岐管による気液二相流の相分離特性に関する研究(第2報, 管径の影響と微小重力実験結果)[Refereed]Scientific journal
- LiBr-水吸収冷凍サイクルの性能特性に関する研究(パラレルフロー及びハイブリッドサイクルのエクセルギー解析)In the case that an absorption cycle is driven by using waste heat as a heat source, it is efficient for the improvement of exergy efficiency to decrease the temperature in regenerators. In this paper, two methods of decreasing the temperature in high-temperature regenerator of double-effect cycle were evaluated based on the energy and the exergy analysis. Those are parallel flow systems, in which aqueous solution is fed to high-and low-temperature regenerators individually, and hybrid cycle with a steam compressor placed at the exit of a low temperature regenerator in order to decrease the dew point of the low temperature regenerator. As a result, it was shown that performance characteristics of LiBr-water absorption cycle is strongly dependent on the difference of solution concentration between the inlet and the exit of the absorber, the maximum value of COP is obtained at 63 wt% at the inlet of the absorber for all cycles, and the temperature in high-temperature regenerator can be decreased by 14℃ for decreasing of 10℃ of dew point in low-temperature regenerator without decreasing in COP by utilizing the hybrid system.The Japan Society of Mechanical Engineers, 2002, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 68, No. 671, pp. 2128-213(671) (671), 2128 - 2134, Japanese[Refereed]Scientific journal
- Oct. 2001, Proceedings of CSPE-JSME-ASME International Conference on Power Engineering, 2・1527-1533, EnglishThe Comparison of the Performance Characteristics of the Two-Fluid Cycle with the Conventional Cycle in Municipal Solid Waste-Burned Power Generation[Refereed]Scientific journal
- In order to develop a phase separation technique under microgravity condition, the method of a Y-junction by utilizing the difference of inertia force between gas and liquid phases is proposed. The experiments for phase separation in the impacting T(θ=90°) and Y(θ = 60°, 30°) junctions of 10.5 mm ID set in a horizontal plane were carried out under normal gravity condition. Air and water were used as the working fluids in the range of the liquid superficial velocity, jLi, of 0.05 to 0.5 m/s and the gas superficial velocity, jCI, of 0.1 to 7.0 m/s. The phase separation performance is improved by the decreasing of the angle θ between the inlet and the side branch. For the Y-junction (θ=60°), about 82% water could be extracted from the inlet two-phase flow at j LI=0.5 m/s and jci=7.0 m/s.Japan Society of Mechanical Engineers, 2001, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 67(654) (654), 350 - 355, Japanese[Refereed]Scientific journal
- Boiling heat transfer and critical heat flux characteristics were experimentally investigated in a SUS316-vertical tube with a teflon-coated wire coil of varying wire diameter and pitch using HCFC -123 as the working fluid. The tube wall was uniformly heated by a direct electric current. The experimental conditions were mass flux G=200̃400 kg/m2s and the thermal equilibrium qualities at the exit of the tube Xeq = 0.1̃0.8. The values of the boiling heat transfer coefficients in the tube with a wire coil were similar to those in the smooth tube in a nucleate boiling region, but in the region of forced convective evaporation a little enhancement of the heat transfer was observed. The critical heat fluxes in the tube with a wire coil at higher quality region were larger than those in the smooth tube.Japan Society of Mechanical Engineers, 2001, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 67(653) (653), 128 - 134, Japanese[Refereed]Scientific journal
- ワイヤーコイル付き垂直管内における強制流動沸騰熱伝達と限界熱流束特性Boiling heat transfer and critical heat flux characteristics were experimentally investigated in a SUS 316-vertical tube with a teflon-coated wire coil of varying wire diameter and pitch using HCFC -123 as the working fluid. The tube wall was uniformly heated by a direct electric current. The experimental conditions were mass flux G=200〜400 kg/m^2s and the thermal equilibrium qualities at the exit of the tube x_The Japan Society of Mechanical Engineers, 2001, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 67, No. 653, pp. 128-134.(653) (653), 128 - 134, Japanese
=0.1〜0.8. The values of the boiling heat transfer coefficients in the tube with a wire coil were similar to those in the smooth tube in a nucleate boiling region, but in the region of forced convective evaporation a little enhancement of the heat transfer was observed. The critical heat fluxes in the tube with a wire coil at higher quality region were larger than those in the smooth tube. [Refereed]Scientific journal - 2001, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 67, No. 654, pp. 350-355., JapaneseY字分岐管による気液二相流の相分離特性に関する研究(第1報,空気-水二相流の地上場での実験結果)[Refereed]Scientific journal
- 2001, Proc. of the 23rd International Symposium on Space Technology and Science, pp.1656-1661., EnglishTwo-Phase Flow Behaviors in Adiabatic Horizontal Pipe under Microgravity[Refereed]International conference proceedings
- To clarify the effect of the centrifugal force on the phase distribution of gas-liquid, two-phase flow in a spiral tube, air-water, two-phase annular flows were visualized by thermal neutron radiography, and the two-dimensional void fraction distributions were measured quantitatively. The offset value of the visualized image depends on the conditions of the object and was estimated with cadmium tape as neutron absorber. An aluminum tube of 8 mm I.D. coiled in a plane and placed vertically was used as the test section. As a result, the cross-sectional and time averaged void fractions were correlated by the drift flux model. From the two dimensional void fraction distributions, the center of liquid mass under each condition was measured. The condition of inversion, that is whether the liquid phase tends to flow at the inside or outside of the spiral tube, could be determined. The condition of the inversion was correlated by the ratio of body force on the gas and the liquid phases, that is, the centrifugal force and gravity.Gordon and Breach Science Publishers Inc., 2001, Nondestructive Testing and Evaluation, 16(2-6) (2-6), 363 - 375, English[Refereed]International conference proceedings
- 2001, Proc. of the 4th. Int. Conf. on Multiphase Flow on CD-ROM, Paper No. 175., EnglishPhase Separation Characteristics of Gas-Liquid Two-Phase Flow in a Y-junction (Application to a phase separator under microgravity)[Refereed]International conference proceedings
- LiBr-水吸収冷凍サイクルの性能特性に関する研究(吸収プロセス, 単効用及び二重効用型サイクルのエクセルギー解析)It is important for energy saving to use the waste heat efficiently. An absorption cycle is effective equipment for the thermal utilization. In order to improve the performance of absorption cycle for the various operating conditions, it is important to analyze the exergy loss in each component and evaluate not only the quantity but also the quality of heat flow. In this paper, the evaluation of exergy loss in the absorption process and an exergy analysis of the single-and double-effect LiBr-water absorption refrigerating cycles whose heat source is a saturated steam at the pressure of 800 kPa were carried out, and the exergy loss in each component were obtained. As a result, it was shown that the exergy coefficients and the COP of the single-effect absorption cycle were about 17% and 80%, and those of the double-effect cycle were about 30 and 140%, respectively.The Japan Society of Mechanical Engineers, 2001, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 67, No. 658, pp.1474-1480(658) (658), 1474 - 1480, Japanese[Refereed]Scientific journal
- 2001, Neutron Radiography (6), pp. 503-506., EnglishApplication to Thermal Hydraulic Phenomena[Refereed]Scientific journal
- Quantitative void fraction measurement method based on the umbra method using a neutron absorber grid was applied to the void fraction measurement of two-phase flow in a 4 × 4 rod bundle. The grid 3 mm in width and 3 mm in interval was made from B4C. The details of the method was discussed in another paper of the present conference. The two-phase flow direction was vertical and the grid was placed vertically between the rod bundle and the neutron source. A cooled-CCD camera in the JRR-3M thermal neutron radiography system was used. CT reconstruction was carried out for sixty horizontal slices with a vertical interval of 3 mm. Cross sectionally averaged one-dimensional void fraction distributions along the flow direction were also calculated with 3 mm interval. Quantitative measurement with spatial resolution 0.18 mm, size of the image element, horizontally and 3 mm vertically was carried out.Gordon and Breach Science Publishers Inc., 2001, Nondestructive Testing and Evaluation, 16(2-6) (2-6), 355 - 362, English[Refereed]International conference proceedings
- A quantitative measurement method by thermal neutron radiography was proposed for two-dimensional void fraction measurement in two-phase flow. The umbra method was modified for two-dimensional measurement by using a neutron absorber grid. Image processing methods to compensate for the effects of neutrons scattered in the object and optical rays scattered in camera were developed. A step made from acrylic resin was tested with a B4C grid 3 mm in width and 3 mm in interval. It was shown that two-dimensional quantitative measurement was possible with this method in sacrifice of the spatial resolution.2001, Nondestructive Testing and Evaluation, 16(2-6) (2-6), 345 - 354, English[Refereed]Scientific journal
- An Improvement of Performance Characteristics in Municipal Solid Waste-Burnt Power GenerationAn improvement of energy conversion efficiency is important for energy saving and for solving the global environmental problems. The two-fluid cycle is dealt with for municipal solid waste(MSW)-burnt power generation, in which the bottoming cycle using C_6H_6, and C_6H_<12> and so on as the working fluid against water in the topping cycle. The performance characteristics of the two-fluid cycle were investigated and compared with those of the single Rankine cycle with the moisture separator. As the result, the optimum plant's thermal efficiency of the two-fluid cycle using C_6H_<12> as the bottoming working fluid is increased by about 1.4% compared with that of the single Rankine cycle with the moisture separator under the main steam temperature of 395℃, and it reaches 24.2%.日本機械学会, Oct. 2000, Proc. 4th JSME-KSME Thermal Engineering Conference, 1・7-11, "1 - 7"-"1-11", English[Refereed]Scientific journal
- Jun. 2000, 日本機械学会論文集Ｂ編, 66・646・349-354, Japanese高温化都市ごみ発電における二流体サイクル特性に関する研究[Refereed]Scientific journal
- Visualization and void fraction measurement are important to study the behaviors of a two-phase flow. It is often difficult to visualize two-phase flows and to measure void fraction distributions in complicated conduits like a rod bundle. In this study, visualization of two-phase flow in a rodbundle near the spacer were carried out and the void fraction distributions were measured by using neutron radiography system in Japan Atomic Energy Research Institute. Quantitative void fraction distributions in a rod bundle were presented.The Visualization Society of Japan, 2000, Transactions of Visualization Society of Japan, 20(1) (1), 333 - 334, Japanese
- An experimental study has been carried out to clarify the characteristics of the void fraction and liquid film thickness of air-water two-phase flow in vertical tubes of 25 mm inside diameter with wire coil of varying wire diameter and pitch. Flow pattern in the experiment of average void fraction and local void fraction distribution in a cross section is bubble flow, and liquid film thickness is in the region of semi-annular and annular flow. It is clarified from these experiments that the average void fraction in tubes with a wire coil is lower than that of the smooth tube and decreases with the wire diameter owing to the centrifugal force of swirl flow which concentrates bubbles at the center of the tube, and the liquid film thickness between the wire coil is uniformed with the decrease of the pitch of wire coil and that liquid film becomes thicker after the passage of wire coil with the increase of the wire diameter.Japan Society of Mechanical Engineers, 2000, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 66(646) (646), 1467 - 1472, Japanese[Refereed]Scientific journal
- Experiments were carried out to investigate the flow pattern, average void fraction, and pressure drop of upward air-water two-phase flow in vertical tubes of 25 mm inside diameter with wire coils of varying wire diameter, pitch and number of coil. Five kinds of flow patterns, i. e., bubble, slug, churn, semi-annular and annular flow, were defined based on the observation of flow behaviors in the experiments. At higher water flow rate, the bubble-slug transition occurred at a lower air flow rate in tubes with wire coil than in the smooth tube. The average void fraction was clarified using the drift flux model. Furthermore, the experimental results of the friction pressure drop were compared with the Lockhart-Martinelli correlation. As a result, a correlation for the constant C in Chisholm's equation was obtained as a function of wire coil pitch-to-diameter ratio.Japan Society of Mechanical Engineers, 2000, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 66(646) (646), 1460 - 1466, Japanese[Refereed]Scientific journal
- The two-fluid cycle is considered for municipal solid waste (MSW) -burned electric power generation, using six kinds of working fluid such as NH 3, C5H12, C6H6, and H2O at the bottoming cycle. The performance characteristics of the two-fluid cycle are obtained at topping steam temperatures of 395 and 495 °C. The optimum cycle conditions, which maximize the plant's thermal efficiency, are determined for the respective working fluid. It is shown that the plant's thermal efficiency of the two-fluid cycle was increased to 25.3% from 19.0%, using C6H6, as the working fluid under the main steam temperature of 395 °C by superheating the bottoming vapor.Japan Society of Mechanical Engineers, 2000, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 66(646) (646), 1607 - 1612, Japanese[Refereed]Scientific journal
- 微小重力場における気液二相環状流の流動特性に関する実験的研究(液膜構造に及ぼす重力及び表面張力の影響)It is important for the realization of two-phase flow thermal control system to clarify the two-phase flow behavior under microgravity condition, especially an annular flow, which is the main flow pattern in the two-phase flow thermal control system. In order to evaluate the effect of the gravity and the surface tension of liquid phase on the liquid film structure, the experiments for an adiabatic gas-liquid two-phase flow in a vertical tube of 10.5 mm in I.D.were carried out under a variety of gravity condition obtained by utilizing a parabolic trajectory flight of an airplane and a drop tower. Gaseous nitrogen and water were used as the working fluids. Furthermore, to decrease the surface tension of the liquid phase, sodium oleate was added into the water. As a result, it was shown that for the higher gas velocity the effect of gravity on the liquid-film thickness was lower, however for the lower gas velocity the liquid-film thickness under microgravity became thinner than that under 1 G.The Japan Society of Mechanical Engineers, 2000, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 66, No. 652, pp. 3085-309(652) (652), 3085 - 3091, Japanese[Refereed]Scientific journal
- 2000, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 66, No. 652, pp. 1467-147, Japaneseワイヤーコイル付き垂直管内上昇気液二相流の流動特性(第2報,ボイド率と液膜厚さの実験結果)[Refereed]Scientific journal
- 2000, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 66, No. 652, pp. 1460-146, Japaneseワイヤーコイル付き垂直管内上昇気液二相流の流動特性(第1報, 流動様式, ボイド率, 圧力損失の実験結果)[Refereed]Scientific journal
- Void Fraction Distribution of Air-Water Two-Phase Flow in a Rod Bundle by Neutron RadiographyQuantitative void fraction measurement methods based on the umbra method using a neutron absorber grid were applied to the void fraction measurement of two-phase flow in a 4x4 rod bundle. The grid 3mm in width and 3mm in interval was made from B_4C. The two-phase flow direction was vertical and the rods of the grid were placed horizontally between the rod bundle and the neutron source. A cooled-CCD camera in the JRR-3M thermal neutron radiography system was used. Cross sectional averaged one-dimensional void fraction distributions along the flow direction were calculated with 3mm interval. Quantitative measurement with spatial resolution 0.18mm, the size of the image element, horizontally and 3mm, the interval of the grid vertically was carried out.日本機械学会, 2000, Proc. of the 4th JSME-KSME Thermal Engineering Conference, Vol. 2, pp. 155-160., "2 - 155"-"2-160", English[Refereed]International conference proceedings
- Velocity and Void Fraction Measurement in Molten Lead-Bismuth Two-Phase Flow by Neutron RadiographyVisualization and void fraction measurement are important to study the behaviors of two-phase flow. It is often difficult to visualize liquid metal two-phase flow and to measure void fraction distribution since both the test section and the fluid are opaque for the optical rays. Experimental techniques were developed to visualize liquid metal flow by neutron radiography. Lead-Bismuth eutectic was used as a working fluid. A tracer method was employed for the visualization of the velocity field. Tracer particles made of gold-cadnium intermetallic compound were used. One-dimensional void fraction distributions in a test section were also measured by image processing methods.日本機械学会, 2000, Proc. of the 4th JSME-KSME Thermal Engineering Conference, Vol. 1, pp. 373-378., "1 - 373"-"1-378", English[Refereed]International conference proceedings
- The Phase Separation Characteristics of a Gas-Liquid Two-Phase Flow in an Impacting Y-Junction (Application to Microgravity Condition)In order to develop a phase separation technique under microgravity condition, the method of the impacting Y-junction by utilizing the difference of inertia force between gas and liquid phases is proposed. The experiments for phase separation in the impacting T (θ=90°) and Y (θ=30°)junctions of 10.5 mm ID set in a horizontal plane were carried out under microgravity condition. Gaseous nitrogen - water, and fluorocarbon FC72 were used as the working fluids. Under the microgravity condition by parabolic trajectory frights of an airplane, the phase separation performance was measured by controlling the extraction rate. As a result, it was shown that the liquid extraction from two-phase flow was possible by Y-junction under microgravity.日本機械学会, 2000, Proc. of the 4th JSME-KSME Thermal Engineering Conference, Vol. 3, pp. 57-62., "3 - 57"-"3-62", English[Refereed]International conference proceedings
- Flow Pattern and Void Fraction Distribution of Gas-Liquid Two-Phase Flow in a Plate Heat Exchanger Measured by Neutron RadiographyIn order to clarify the flow behavior of gas-liquid two-phase flow in plate heat exchanger used in air-conditioning system, flow behavior of adiabatic and boiling two-phase flows were visualized by a neutron radiography method. In the experiments under adiabatic condition, the air-water two-phase flows in an aluminum plate heat exchanger consisted of a single passage with grooves cut at an angle to the flow direction were visualized. In the boiling two-phase flow experiments, chlorofluorocarbon R141b was used as the working fluid. From the visualized images the two-dimensional distributions of void fraction were measured by some image processing techniques. As a result, it was shown that the liquid phase tended to flow straight and the phase distributions were strongly affected by the configuration at the inlet of heat exchanger.日本機械学会, 2000, Proc. of the 4th JSME-KSME Thermal Engineering Conference, Vol. 1, pp. 591-596., "1 - 591"-"1-596", English[Refereed]International conference proceedings
- 2000, Proc. U.S.-Japan Seminar on Two-Phase Flow Dynamics, pp. 401-406, EnglishA Study on a Gas-Liquid Phase Separation Technique by Y-Junction under Microgravity Condition[Refereed]International conference proceedings
- An Exergy Analysis of the LiBr-Water Triple-Effect Absorption-type RefrigeratorIt is important to use the waste heat efficiently for energy saving. An absorption cycle is efficient as the thermal utilizing equipment of the waste heat. In order to improve the performance of absorption cycle for the various operating conditions, it is important to analyze the exergy loss in each component and evaluate not only the quantity but also the quality of heat flow. This paper deals with the performance characteristics of the triple-effect LiBr-water absorption refrigerating system. Moreover, the hybrid system with a steam compressor at the exit of the low temperature regenerator is proposed to decrease the solution temperature in a high temperature regenerator, and the performance of the hybrid system was evaluated. As a result, it was shown that there was an optimum condition on the exergy coefficient and the COP of the triple-effect absorption cycle, and that values were about 181 % and 29.3 %, respectively. By the adoption of the hybrid system, the solution temperature in the high temperature regenerator can be reduced from 222 ℃ to 189 ℃. In that case, the COP decreased to about 173 %, but the exergy efficiency increased to 31.9 % due to decrease in the temperature of the heat source.日本機械学会, 2000, Proc. of the 4th JSME-KSME Thermal Engineering Conference, Vol. 3, pp. 635-640., "3 - 635"-"3-640", English[Refereed]International conference proceedings
- 2000, Proc. of Symposium on Energy Engineering in the 21st Century (SEE2000), pp. 1122-1129., EnglishAn Exergy Analysis of the LiBr-Water Absorption Refrigerating Cycle[Refereed]International conference proceedings
- Jan. 2000, Proceedings of Symposium on Energy Engineering in the 21st Century, 1438-1445, EnglishPerformance Evaluation of the Two-Fluid Cycle in Municipal Solid Waste-Burnt Power Generation[Refereed]Scientific journal
- Jun. 1999, 日本機械学会論文集B編, 65・634・278-283, Japanese都市ごみ発電における二流体サイクルの性能特性に関する研究[Refereed]Scientific journal
- Visualization and measurement of refrigerant flow in compression-type refrigerator by neutron radiographyThe refrigerant two-phase flows in a capillary tube and a distributor used in a compression-type refrigerator were visualized by real-time neutron radiography. The thermal neutron radiography system of JRR-3M at the Japan Atomic Energy Research Institute was used. In the visualization experiments of the two-phase Row in the capillary tube of 2 mm I.D., a cooled CCD camera was used, and the axial one-dimensional distributions of void fraction were measured. For the distributor, a high sensitivity video camera with a silicone intensified target tube was used. From the visualized images, the refrigerant behaviors in the distributor were clearly shown, and the liquid fraction in each tube was measured. As a result, it was shown that the refrigerant behaviors in the distributor effected the distributing performance of the refrigerant flow, (C) 1999 Published by Elsevier Science B.V. All rights reserved.ELSEVIER SCIENCE BV, Mar. 1999, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 424(1) (1), 98 - 103, English[Refereed]Scientific journal
- Application of fast neutron radiography to three-dimensional visualization of steady two-phase flow in a rod bundleThree-dimensional void fraction distribution of air-water two-phase flow in a 4 x 4 rod-bundle near a spacer was visualized by fast neutron radiography using a CT method. One-dimensional cross sectional averaged void fraction distribution was also calculated. The behaviors of low void fraction (thick water) two-phase flow in the rod bundle around the spacer were clearly visualized. It was shown that the void fraction distributions were visualized with a quality similar to those by thermal neutron radiography for low void fraction two-phase flow which is difficult to visualize by thermal neutron radiography. It is concluded that the fast neutron radiography is efficiently applicable to two-phase flow studies. (C) 1999 Elsevier Science B.V. All rights reserved.ELSEVIER SCIENCE BV, Mar. 1999, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 424(1) (1), 73 - 76, English[Refereed]Scientific journal
- 1999, Nuclear Instruments and Methods in Physics Research -A, Vol. 424, No. 1, pp. 203-212., EnglishThree-Dimensional Visualization of Void Fraction Distribution in Steady Two-Phase Flow by Thermal Neutron Radiography[Refereed]Scientific journal
- 1999, Proc. the Asia Symposium on Multiphase Flow, pp. 275-282., EnglishNeutron Radiography as a Tool for Multiphase Flow Researches in Industrial Machines[Refereed]International conference proceedings
- Three-dimensional visualization of void fraction distribution in steady two-phase flow by thermal neutron radiographyThree-dimensional void fraction distributions of a steady air-water two-phase flow in a 4 x 4 rod-bundle with circular ferrule type spacers were measured by neutron radiography using a CT method. The high flux thermal neutron radiography system at JRR-3M in JAERI was used. Two-phase flow was visualized with a SIT tube camera and time-averaged one-dimensional cross sectional averaged void fraction distributions were calculated. Visualization with high spatial resolution up to 0.18 mm was carried out by using a cooled CCD camera. Projections in 250 directions were obtained and were reconstructed by a filtered back projection method after using some image processing techniques. Animations were made to show the three-dimensional distributions. One-dimensional and three-dimensional void fraction distributions of the steady state two-phase flow in the rod bundle near the spacer were clearly visualized. (C) 1998 Elsevier Science S.A. All rights reserved.ELSEVIER SCIENCE SA, Aug. 1998, NUCLEAR ENGINEERING AND DESIGN, 184(2-3) (2-3), 203 - 212, English[Refereed]Scientific journal
- Flow characteristics of gas-liquid two-phase annular flow under microgravity (Experimental results utilizing a drop tower)In order to predict various phenomena related to flow and heat transfer in space, it is necessary to carry out experiments under microgravity. The present work is concerned with the characteristics of gas-liquid two-phase annular flow under microgravity condition utilizing a drop tower. The experiments were carried out in a vertical transparent acrylic tube of 10.5 mm I.D. and 200 mm length, using a mixture of gaseous nitrogen (GN2) and water as the working fluid, in an annular flow region. The mean void fraction, pressure drop and liquid film thickness under microgravity were obtained and compared with the results of a ground test. It was found that the roughness of the liquid film surface was less and the mean liquid film thickness became greater under microgravity than under normal gravity.JAPAN SOC MECHANICAL ENGINEERS, Aug. 1998, JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, 41(3) (3), 561 - 567, English[Refereed]Scientific journal
- 給湯配管中の水撃現象防止に関する基礎的研究(拡大管による影響)When the valve in water supply pipes is closed suddenly, the flow stops and the momentum changes with the inertia of water flow. We call it as "Water hammering". A fundamental study of water hammer softening in household water supply pipes is carried out experimentally and theoretically. Three kinds of enlargement tubes of 80,120,160 mm in inner diameter with the same length of Φ200 mm and four kinds of the enlargement tubes of 120 mm inner diameter with five kinds of length of 3,5,10,50,200 mm were tested in order to reduce the pressure rise and the slope of the pressure rise. As a result, it was found that as the diameter of the enlarged part became greater, the reduction of the pressure rise became greater and the slope of the pressure rise became greater.The Japan Society of Mechanical Engineers, 1998, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 64, No. 627, pp. 3753-375(627) (627), 3753 - 3758, Japanese[Refereed]Scientific journal
- 1998, Proc. of the ASME Int. Mechanical Engineering Congress and Exposition, HTD-vol.361-5, pp. 305-312., EnglishVoid Fraction Distribution Patterns of Steady Air-Water Two-Phase Flow in a Rod Bundle with a Spacer[Refereed]International conference proceedings
- 1998, Proc. of the 3rd. Int. Conf. on Multiphase Flow on CD-Rom, Paper No. 322., EnglishVisualization of Refrigerant Gas-Liquid Two-Phase Flow inside a Distributor by Neutron Radiography[Refereed]International conference proceedings
- 1998, Proc. of the 3rd. Int. Conf. on Multiphase Flow on CD-Rom, Paper No. 274., EnglishThe Liquid Film Structure in a Two-Phase Gas-Liquid Annular Flow[Refereed]International conference proceedings
- 1998, Proc. of the ASME Int. Mechanical Engineering Congress and Exposition, HTD-vol.361-5, pp. 297-304., EnglishFlow Pattern of Gas-Liquid Two-Phase Annular Flow in a Spiral Tube[Refereed]International conference proceedings
- 1998, Proc. 1st European-Japanese Two-phase Flow Group Meeting and 36th European Two-phase Flow Group Meeting, Paper No. H-3., EnglishApplication of Thermal and Fast Neutron Radiography to Visualization of 3-D Void Fraction Distribution of Gas-liquid Two-phase Flow[Refereed]International conference proceedings
- 微小重力下における気液二相環状流の流動特性(落下塔を利用した実験結果)In order to predict various phenomena related to flow and heat transfer in space, it is necessary to carry out experiments under microgravity. The present work is concerned with the characteristics of gas-liquid two-phase annular flow under microgravity condition utilizing a drop tower. The experiments were carried out in a vertical transparent acrylic tube of 10.5 mm I.D. and 200 mm length, using a mixture of gaseous nitrogen (GN_2) and water as the working fluid, in an annular flow region. The mean void fraction, pressure drop and liquid film thickness under microgravity were obtained and compared with the results of a ground test. It was found that the roughness of the liquid film surface was less and the mean liquid film thickness became greater under microgravity than under normal gravity.The Japan Society of Mechanical Engineers, 1997, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 63, No. 606, pp.631-636.(606) (606), 631 - 636, Japanese[Refereed]Scientific journal
- 1997, Proc. 8th Int. Topical Meeting on Nuclear Reactor Thermal Hydraulics, Vol.3, pp. 1622-1629., EnglishVisualization and Three-Dimensional Void Fraction Measurement of Steady Air-Water Two-Phase Flow in a 4x4 Rod Bundle by Neutron Radiography[Refereed]International conference proceedings
- 1997, Neutron Radiography (5), pp. 383-394., EnglishVisualization and Image-Processing of Multiphase Flow by Neutron Radiography[Refereed]Scientific journal
- 1997, Neutron Radiography (5), pp. 118-125., EnglishThree-Dimensional Void Fraction Measurement of Two-Phase Flow in a Rod Bundle by Neutron Radiography.[Refereed]Scientific journal
- 1997, Neutron Radiography (5), pp. 623-619., EnglishApplication of Neutron Radiography to a Diagnosis of Refrigerator[Refereed]Scientific journal
- Void fraction distribution measurement in two-phase flow by real-time neutron radiography and real-time image processingA real-time two-dimensional void fraction distribution measurement of gas-liquid two-phase Row was carried out by real-time neutron radiography and real-time image processing. The JRR-3M real-time thermal neutron radiography system and a Musashi dynamic image of processing system were used. Image processing methods to calculate two-dimensional and cross-sectional void fraction distributions were proposed. The void fraction distribution was calculated by non-linear processing of the neutron radiography image and displayed by pseud-color in real-time. A simple gas-liquid two-phase Bow induced by injecting gas through needles at the bottom of water pool in a rectangular vessel was tested.ELSEVIER SCIENCE BV, Jul. 1996, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 377(1) (1), 153 - 155, English[Refereed]Scientific journal
- Three-dimensional void fraction measurement of two-phase flow in a rod bundle by neutron radiographyThree-dimensional void fraction distribution and one-dimensional cross-sectional averaged void fraction distribution of air-water two-phase flow in a 4 x 4 rod bundle near a spacer was measured by neutron radiography using a CT method. Two-phase flow behavior in the rod bundle near the spacer, which is important to study from the safety considerations of nuclear reactors and which is difficult to observe by other methods, was clearly visualized.ELSEVIER SCIENCE BV, Jul. 1996, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 377(1) (1), 115 - 118, English[Refereed]Scientific journal
- Liquid metal flow measurement by neutron radiographyVisualization of a liquid metal flow and image processing methods to measure the vector field are carried out by real-time neutron radiography. The JRR-3M real-time thermal neutron radiography facility in the Japan Atomic Energy Research Institute was used, Lead-bismuth eutectic was used as a working fluid. Particles made from a gold-cadmium intermetallic compound (AuCd3) were used as the tracer for the visualization. The flow vector field was obtained by image processing methods. It was shown that the liquid metal flow vector field was obtainable by real-time neutron radiography when the attenuation of neutron rays due to the liquid metal was less than lie and the particle size of the tracer was larger than one image element size digitized for the image processing.ELSEVIER SCIENCE BV, Jul. 1996, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 377(1) (1), 156 - 160, English[Refereed]Scientific journal
- Application of neutron radiography to visualization of cryogenic fluid boiling two-phase flowsLiquid nitrogen boiling two-phase Rows in a metallic container and in a heat exchanger were visualized by real-time thermal neutron radiography at JRR-3M at the Sapan Atomic Energy Research Institute and image processed by the Musashi dynamic image processing system. Boiling phenomena in a pool and boiling two-phase flow in an aluminum plate fin type heat exchanger were visualized. It was shown that neutron radiography was applicable to visualization of cryogenic boiling two-phase flow and the designs of cryogenic heal exchanges.ELSEVIER SCIENCE BV, Jul. 1996, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 377(1) (1), 174 - 176, English[Refereed]Scientific journal
- Application of neutron radiography to a diagnosis of refrigeratorA diagnosis of the refrigerant flows in a refrigerator was carried out by real-time neutron radiography. The thermal neutron radiography system of JRR-3M in Japan Atomic Energy Research Institute and the real-time image processing system developed by Musashi Institute of Technology were used. From evaporating flows in the evaporator, condensing flows in the condenser, flashing flows in the capillary tube and flows in the accumulator were visualized and the dynamic behaviors under practical conditions were clarified. In the case of the capillary tube of 0.8 mm i.d., a cooled-CCD camera was utilized.ELSEVIER SCIENCE BV, Jul. 1996, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 377(1) (1), 170 - 173, English[Refereed]Scientific journal
- T-ジャンクションによる気液二相流の相分離特性(地上実験結果と微小重力場への適用)Recently, a two-phase thermal control system has been proposed to increasing the output power of large artificial satellites and space stations. For such a system, it will be important to establish a phase separation technique of a gas-liquid two-phase flow. In this paper, an impacting T-junction is proposed as the phase separation technique under microgravity. Ground experiments were first performed to clarify the phase separation characteristics. From the experiments, it was found that the inlet flow pattern and liquid velocity affected the phase separation most and that phase separation for stratified and wavy flow regions was difficult. Moreover, to verify the applicability of the T-junction under microgravity, experiments utilizing parabolic-trajectory flights were also performed. As a result, it was shown that the T-junction is an effective device for roughly separating gas and liquid under microgravity.The Japan Society of Mechanical Engineers, 1996, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 62, No. 594, pp.447-453.(594) (594), 447 - 453, Japanese[Refereed]Scientific journal
- 1996, Proc. of the 3rd. KSME-JSME Thermal Engineering Conf, pp. I-345-I-350., EnglishFlow Characteristics of Gas-Liquid Two-Phase Flow under Microgravity (The structure of liquid film)[Refereed]International conference proceedings
- 微小重力下における気液二相流の流動特性(航空機を利用した実験結果)In order to predict various phenomena related to flow and heat transfer in space, it is necessary to carry out experiments under microgravity. The present report deals with the characteristics of a gas-liquid two-phase flow under microgravity utilizing parabolic trajectory flights. The experiment was carried out in a horizontal transparent acrylic resin tube of 10.5 mm I. D. and 500 mm length, using gaseous N_2 and water as the working fluid, in a superficial gas velocity range of 0.025m/s to 4.6m/s and superficial water velocity range of 0.062m/s to 0.35m/s. The flow pattern, pressure drop and void fraction obtained in the microgravity experiment were compared with the results in the ground test, and also with other experimental results obtained under normal gravity. As a result, the two-phase frictional multiplier could be expressed by correlation of φ^2_L=1+16/X+1/X^2 using the Martinelli parameter X.The Japan Society of Mechanical Engineers, 1995, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 61, No. 585, pp.1640-1645(585) (585), 1640 - 1645, Japanese[Refereed]Scientific journal
- 1995, Proc. of the 2nd Int. Topical Meeting on Neutron Radiography System Design and Characterization, pp. 360-365., EnglishVoid Fraction Distribution Measurement in Two-phase Flow by Real-time Neutron Radiography and Real-time Image Processing[Refereed]International conference proceedings
- 1995, Proc. of The 2nd Int. Conf. on Multiphase Flow '95, pp. IN2-27 – IN2-32., EnglishVisualization of Two-Dimensional Void Fraction Distribution by Neutron Radiography[Refereed]International conference proceedings
- 1995, Proc. of the 2nd Int. Topical Meeting on Neutron Radiography System Design and Characterization, pp. 258-262., EnglishThree-dimensional Void Fraction Measurement of Two-phase Flow in a Rod Bundle by Neutron Radiography[Refereed]International conference proceedings
- 1995, Proc. of the 2nd Int. Topical Meeting on Neutron Radiography System Design and Characterization, pp. 366-372., EnglishLiquid Metal Flow Measurement by Neutron Radiography[Refereed]International conference proceedings
- 1995, Proc. of The 2nd Int. Conf. on Multiphase Flow '95, pp. P6-1-P6-5., EnglishFlow Characteristics of Gas-Liquid Two-Phase Flow under Microgravity Condition[Refereed]International conference proceedings
- 1995, Proc. of the 2nd Int. Topical Meeting on Neutron Radiography System Design and Characterization, pp. 398-403., EnglishApplication of Neutron Radiography to Visualization of Cryogenic Fluid Boiling Two-Phase Flows[Refereed]International conference proceedings
- 1995, Proc. of the 2nd Int. Topical Meeting on Neutron Radiography System Design and Characterization, pp. 392-397., EnglishApplication of Neutron Radiography to a Diagnosis of Refrigerator[Refereed]International conference proceedings
- A thin wire is installed just upstream of the throat in a convergent-divergent nozzle in order to decrease pressure undershoot (that is, the degree of the thermal nonequilibrium) at the throat. To study the effect of the wire diameter (0.3 to 1.5mm) on the nozzle performance, experiments have been carried out using initially subcooled hot water under inlet pressures of 0.47, 0.62 and 0.77MPa, and inlet subcoolings of 6, 12, and 19K. The one-dimensional void fraction is measured. Moreover, the measured pressure profiles and void fractions are compared with those calculated using the code "MINI-TRAC". The results are summarized as follows: (1) The greater the inlet subcooling or the lower the inlet pressure, the greater the improvement (using the method of a wire installation) of the nozzle performance. (2) The difference of the wire diameter has little effect on the nozzle performance. The pressure profiles for the nozzle with the wire agree with those calculated from the code "MINI-TRAC". (3) The one-dimensional void fraction profile can be obtained using real-time neutron radiography and image processing.The Japan Society of Mechanical Engineers, 1991, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 57, No. 533, pp.256-261.(533) (533), 256 - 261, Japanese[Refereed]Scientific journal
- A thin wire is installed just upstream of the throat in a convergent-divergent nozzle in order to decrease pressure undershoot (that is, the degree of the thermal nonequilibrium) at the throat. To study the effect of the wire diameter (0.3 to 1.5mm) on the nozzle performance, experiments have been carried out using initially subcooled hot water under inlet pressures of 0.47, 0.62 and 0.77MPa, and inlet subcoolings of 6, 12, and 19K. The one-dimensional void fraction is measured. Moreover, the measured pressure profiles and void fractions are compared with those calculated using the code "MINI-TRAC". The results are summarized as follows: (1) The greater the inlet subcooling or the lower the inlet pressure, the greater the improvement (using the method of a wire installation) of the nozzle performance. (2) The difference of the wire diameter has little effect on the nozzle performance. The pressure profiles for the nozzle with the wire agree with those calculated from the code "MINI-TRAC". (3) The one-dimensional void fraction profile can be obtained using real-time neutron radiography and image processing.The Japan Society of Mechanical Engineers, 1991, Proc. of the ASME/JSME Thermal Engineering Joint Conference, pp. 175-181.(533) (533), 256 - 261, English[Refereed]International conference proceedings
- From the view point of energy saving and the development of new energy resources, it is important to utilize geothermal resources and waste heat from factories. As one of the energy conversion expanders, there is a radial outflow reaction turbine (that is, Hero's turbine). Performance characteristics of Hero's turbine using subcooled hot water as a working fluid are clarified analytically and experimentally. It is found that : (a) there is an optimum rotational speed at which maximum turbine efficiency can be obtained, (b) Hero's turbine internal efficiency can be expressed by an algebraic equation (7), and (c) nozzle loss amounts to almost 90 percent of the total turbine loss.The Japan Society of Mechanical Engineers, 1990, Trans. of the Japan Society of Mechanical Engineers, Series B, Vol. 56, No. 531, pp. 3419-342(531) (531), 3419 - 3424, Japanese[Refereed]Scientific journal
- Visualizations by real-time neutron radiography are demonstrated of various flow patterns of nitrogen gas-water two-phase flow in a stainless-steel tube, water inverted annular flow in a stainless-steel tube, flashing flow in an aluminium nozzle and fluidized bed in aluminium tube and vessels. Photographs every 1/60 s are presented by an image processing method to show the dynamic behaviours of the various flow patterns. It is shown that this visualization method can be applied efficiently to multiphase flow researches and will be applicable to multiphase flows in industrial machines. © 1990.1990, Flow Measurement and Instrumentation, 1(3) (3), 149 - 156, English[Refereed]Scientific journal
- 1989, Proc. of Int. Conf. of Mechanics of Two-Phase Flows, pp. 67-72., EnglishVisualization and Void Fraction Measurement in a One-Component Two-Phase Flow in a Nozzle by Neutron Radiography[Refereed]International conference proceedings
- 1989, Proc. of Int. Conf. of Mechanics of Two-Phase Flows, pp. 451-456., EnglishPerformance Characteristics of Hero’s Turbine for Flashing Expansion of Initially Subcooled Hot Water[Refereed]International conference proceedings
- 2021, 日本冷凍空調学会年次大会講演論文集(CD-ROM), 2021Suppression of Heat Transfer Deterioration of Falling Film Evaporation at Low Film Flow Rate by Increasing Nucleation Site Density
- 2020, 日本機械学会流体工学部門講演会講演論文集(CD-ROM), 98thEffect of Bubble flow on Heat Transfer Characteristics in Gas-Liquid Two-Phase Flow in a Horizontal Tube Bundle
- 2020, 日本機械学会流体工学部門講演会講演論文集(CD-ROM), 98thVoid Fraction Measurement of Refrigerant Two-phase Flow in Cross-flow Mini-Channel Evaporator
- 2020, 日本機械学会流体工学部門講演会講演論文集(CD-ROM), 98thClarification of Water Transport and the Electrochemical Characteristics in Polymer Electrolyte Fuel Cell
- 2018, 日本伝熱シンポジウム講演論文集(CD-ROM), 55th固体高分子形燃料電池の膜厚方向水分布と電気特性の同時計測
- Oct. 2017, Refrigeration, (92) (92), 1080, Japanese熱交換器の現状と課題[Refereed]Introduction scientific journal
- 日本冷凍空調学会, 2017, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A113 - 1-6, JapaneseStudy on Boiling Heat Transfer Characteristics of Upward Boiling Flows in a Single-Channel Plate-Fin Heat Exchanger : Effect of fin pitch
- 日本冷凍空調学会, 2017, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A324 - 1-5, JapanesePool Boiling Heat Transfer Characteristics around a Horizontal Low Thermal Conductivity Tube : Hysteresis effect and heat transfer enhancement by thermal spray coating under hot water heating condition
- 日本冷凍空調学会, 2017, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A312 - 1-5, JapaneseImprovement in Condensing Heat Transfer Performance by an Insert into a Quadrilobed Heat Transfer Tube
- Sep. 2016, 2016年度日本冷凍空調学会年次大会講演論文集, CD-ROM, A322(3 pages)四葉管熱交換器の水側伝熱促進
- The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 405 - 405, JapaneseP031 Study on Water Spraying Characteristics from a Nozzle used in Condenser of Geothermal Power Plant
- 日本非破壊検査協会, Jan. 2016, 非破壊検査, 65(1) (1), 25 - 32, JapaneseVisualization of Mass Transfer Phenomena in Energy Equipment by using Neutron Radiography (Application to Polymer Electrolyte Fuel Cell and Refrigerating Equipment)
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, D142 - 1-6, JapaneseAdsorption Characteristics of Desiccant Element with Organic Adsorbent
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A112 - 1-6, JapaneseStudy of Pressure Drop Characteristics in Plate-Fin Heat Exchanger
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A113 - 1-5, Japanese正方形細管内一成分系垂直上昇気液二相流のボイド率特性
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A153 - 1-3, JapaneseActivity of the Research Project "Advanced Heat Transfer Technology to Develop for Various Environments"
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A213 - 1-6, Japaneseオリフィスを通過するCO₂臨界流の流動特性に及ぼすオイル混入の影響
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A212 - 1-6, JapaneseCondensing Heat Transfer Characteristic in Quadrilobed Tube with a Clearance for Leak Detection for Heat Pump Water Heater
- 2016, KURRI-EKR (Web), (1) (1)中性子イメージングの高度化と応用
- 2016, 日本機械学会流体工学部門講演会講演論文集(CD-ROM), 94th水平バンドル内気液二相流の正方および千鳥配列の違いによる流動への影響
- 日本冷凍空調学会, 2016, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A111 - 1-6, JapaneseStudy on thermal-hydraulics characteristics around a tube in two-phase flows cross horizontal tube bundle
- Effect of velocity profile on accuracy of transit-time ultrasonic flow meter<p>The transit time ultrasonic flow meter (TOF) has been widely applied in industry due to its advantages, such as applicability to larger diameter pipe, small pressure loss, etc. Since the TOF derives flow rate from the change of the trantis time between two sensors, the accuracy of TOF is strongly influenced by velocity profile in the pipe. Velocity profile is influenced by not only the upstream condition but also the shape of tranducer pocket on the pipe wall. In this paper, in order to evaluate influence of velocity distribution on the accuracy of TOF, a system to measure the tiransit time and the velocity profile simulataneouly was developed. In experiments, an obstacle plate was installed to distort velocity profiles. The velocity profiles and their transit times of ultrasonic pulses were compared. As a result, line-averaged velocities calculated from the transit time were good agreement with the line-averaged velocities obtained by using UDM.</p>The Japan Society of Mechanical Engineers, 2016, The Proceedings of the National Symposium on Power and Energy Systems, 2016(0) (0), Japanese
- Jan. 2016, International Journal of Microgravity Science and Application, 33(1) (1), English[Refereed]Report scientific journal
- [日本航空宇宙学会西部支部], Jan. 2016, International Journal of Microgravity Science and Application, 33(1) (1), 6p, English[Refereed]Report scientific journal
- B133 Effect of Dissolved Air on Flow Boiling Heat Transfer and Bubble BehaviorThis study involved conducting subcooled flow boiling experiments using various different dissolved air concentrations in the Perfluorohexane (PFH) in order to clarify its effects on flow boiling heat transfer through a tube with an inner diameter of 4 mm, the following parameters were calculated and discussed excess temperature, boiling curve. Consequently, dissolved air was shown to affect boiling characteristics. In particular, dissolved air significantly affected the boiling curve in the low heat flux region, and the boiling curve was continuously decreased with increasing the effective heat flux for G = 300 [kg/m^2s], respectively. Also dissolved air significantly affect the onset of boiling.The Japan Society of Mechanical Engineers, 23 Oct. 2015, Procee[d]ings of Thermal Engineering Conference, 2015, "B133 - 1"-"B133-2", Japanese
- H222 A study of heat transfer characteristics of oscillating heat pipeThis study experimentally investigated the heat transfer characteristics of oscillating heat pipe (OHP). The OHP was made of copper flat plate, and its flow pattern can be visualization. This OHP had 20 parallel channels. In this study the working fluid was ethanol. The installed condition of the experimental apparatus were performed at horizontal and vertical. As a result, the oscillation frequency of the liquid column increased with the heat input increase, and the effective thermal conductivity is increased. The liquid supply to the heating area a vertical condition was sufficient by gravity. Therefore the maximum effective thermal conductivity of the vertical condition and the horizontal condition was about 15 times and 12.5 times that of copper.The Japan Society of Mechanical Engineers, 23 Oct. 2015, Procee[d]ings of Thermal Engineering Conference, 2015, "H222 - 1"-"H222-2", Japanese
- C133 Visualization and Measurement of Adsorbed Amount Distribution of Ethanol in Activated Carbon Adsorbent BedIt is important for a design of an adsorber to clarify adsorbed refrigerant distribution in adsorbent bed during transient conditions with adsorption or desorption, because the adsorption and desorption process is complex phenomena with heat and mass transfer and strongly effect on the cycle performance of an adsorption refrigerating cycle. Adsorbed refrigerant distributions in an activated carbon particle bed in a metallic rectangular vessel had been quantitatively measured by a neutron radiography method. Ethanol was used as the refrigerant. An umbra method using a checked neutron absorber grid was applied for a quantitative measurement. The measured mass attenuation coefficient of ethanol was 0.386 m^2/kg. It was confirmed from the measurement for an adsorption bed in adsorption equilibrium that the adsorption amount could be quantitatively measured by the method. From the experiments of adsorption and desorption process with heat transfer, it could be clearly visualized that the adsorbed amount in the adsorption process was strongly affected by the position of the heat-transfer surface. In the desorption process, the effect was relatively small, because the heat diffusion in the adsorption bed might be enhanced by regenerated superheated vapor flow.The Japan Society of Mechanical Engineers, 07 Jun. 2015, National Symposium on Power and Energy Systems, 2015(20) (20), 79 - 82, Japanese
- The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 373 - 373, JapaneseM809 Effect of artificial cavities on flow boiling heat transfer
- 日本冷凍空調学会, 2015, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A126 - 1-4, JapaneseEffect of Tube Diameter on Void Fraction of One-Component Gas-Liquid Two-Phase Flow
- 日本冷凍空調学会, 2015, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A101 - 1-4, Japaneseオリフィスを通過する入口サブクールとしたCO₂冷媒の流量特性
- 0402 Effect of velocity extension on the velocity accuracy using ultrasonic pulsed Doppler methodUltrasonic pulsed Doppler method (UDM) can obtain velocity profile along the ultrasonic beam path. However, the UDM has the limitation of the detectable velocity based on the measurement volume size. This problem was apparent when higher velocity were measured by using a velocity extension method. In order to investigate the accuracy of the velocity extension method, velocity distributions in a rotating cylinder were measured with changing of the measurement volume, and the relation between the maximum velocity required for the reflector to remain in the same measurement volume during the pulse interval, ν_<allow>, and the measured velocity was investigated. It was found that if measured velocities were higher than the ν_<allow>, the velocity accuracy dramatically decreased. Further, the tendency was more apparent with going away from the transducer.The Japan Society of Mechanical Engineers, 2015, The Proceedings of the Fluids engineering conference, 2015(0) (0), _0402 - 1_-_0402-2_, Japanese
- C211 Evaluation of Droplet Shape and Pressure Drop in the Gas Channel in a Polymer Electrolyte Fuel CellIn order to evaluate the local pressure drop in the gas channel of a polymer electrolyte fuel cell (PEFC), liquid droplet were modeled as two shapes by using neutron radiography. Based on the models, local pressure drop caused by a droplet were evaluated by CFD as a function of the water saturation, and it was applied to a network model calculating gas velocity distributions in the PEFC. Two dimensional water distributions measured by neutron radiography were applied to the network model, and the pressure drop between inlet and outlet of the gas channel were good agreement with the experimental results.The Japan Society of Mechanical Engineers, 25 Jun. 2014, National Symposium on Power and Energy Systems, 2014(19) (19), 277 - 278, Japanese
- C111 Heat Transfer Characteristic of a Plate Type Condenser for Heat Pump Water HeaterThis study deals with heat transfer characteristics in a blazing plate heat exchanger used as a condenser in heat pump hot water heater. In this report, experiments of single channel heat exchanger were carried out by using a pump driven two-phase flow loop. The test section has one path for each fluid, refrigerant and water. The effects of mass flow rate of refrigerant and water, wave height of plate, and setting arrangement, vertical with downward refrigerant flow or horizontal, were examined. HFC134a was used as the refrigerant. Superheated vapor was supplied to the condenser, and heated water. Water was flowing in the counter flow direction. The wall temperature distribution of the refrigerant path was measured by an infrared camera. As a result, it was shown that the lateral temperature distribution for the horizontal arrangement was affected by the wave pattern while that for the vertical arrangement was uniform.The Japan Society of Mechanical Engineers, 25 Jun. 2014, National Symposium on Power and Energy Systems, 2014(19) (19), 75 - 78, Japanese
- 日本冷凍空調学会, 2014, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A143 - 1-4, JapaneseVisualization and Measurements of Adsorption and Desorption Process in an Activated Carbon/Ethanol Pair Adsorber
- F224 Heat Transfer Performance of Plate-type Condenser for Heat Pump Water HeaterCondensing heat transfer performance of a blazing plate heat exchanger was examined on the basis that the heat exchanger will be used as a condenser in a heat pump water heater. The effects of number of refrigerant paths and setting placement, such as a vertical placement with downward refrigerant flow or a horizontal placement, were evaluated. HFC134a was used as the refrigerant. Water was supplied to form a counterflow heat exchange. Three kinds of heat exchangers with different refrigerant paths of 6, 10, and 14 were used. Refrigerant temperatures at the exit of paths were measured by inserted thermocouples to evaluate the flow distribution. As a result, it was shown that vertical placement produced higher heat transfer rate than the horizontal placement. For the horizontal placement, heat transfer rate decreased with an increase of refrigerant channels due to uneven refrigerant distribution.The Japan Society of Mechanical Engineers, 18 Oct. 2013, Procee[d]ings of Thermal Engineering Conference, 2013, 383 - 384, Japanese
- A102 Modeling of Liquid Drop in the Gas Channel and Analysis of Gas-velocity Distribution in a PEFCA network model has been proposed in order to predict the gas velocity distributions in a PEFC It analyzes the gas-velocity distributions depending on the local pressure drop which is affected by the gas-flow rate and the water accumulation Liquid drop form was observed in a PEFC by using neutron radiography, and classified into two models The one is small liquid drop accumulated near the rib corner, and the other is larger drop which is generated to be combined with small drops Numerical simulations were carried out for obtaining the local pressure drop caused by a liquid drop, and correlation equations were obtained for the pressure loss coefficientThe Japan Society of Mechanical Engineers, 19 Jun. 2013, National Symposium on Power and Energy Systems, 2013(18) (18), 5 - 6, Japanese
- The Japan Society of Mechanical Engineers, 05 Jun. 2013, Journal of the Japan Society of Mechanical Engineers, 116(1135) (1135), 390 - 391, JapaneseCentral Heat Supply System Using Distributed Heat Storage Unit for Multiple Dwelling Houses
- The Society of Heating, Air-Conditioning Sanitary Engineers of Japan, 15 Apr. 2013, 空気調和・冷凍に関する連合講演会講演論文集, (47) (47), 43 - 46, Japanese3 The Heat Pump System using High Temperature Refrigerants
- 日本工業出版, Mar. 2013, 配管技術, 55(4) (4), 1 - 8, Japanese国際宇宙ステーションでの沸騰・二相流実験[Refereed]Introduction scientific journal
- 2013, 混相流シンポジウム講演論文集(CD-ROM), 2013二相流体ループISS実験装置のシステム特性
- 日本冷凍空調学会, 2013, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, 169 - 172, Japaneseキャピラリーチューブ内CO₂冷媒の減圧沸騰流に関する研究
- 日本原子力学会, Dec. 2012, 日本原子力学会誌, 54(12) (12), 789 - 7943, Japanese東日本大震災におけるエネルギーインフラの被害調査と問題分析；日本機械学会東日本大震災調査・提言分科会WG５の活動[Refereed]Introduction scientific journal
- A121 A study on Flashing Flow Characteristics of CO_2 in a Capillary TubeThis paper deals with decompression flashing flows through an adiabatic capillary tube with inlet subcooling and supercritical conditions. Blowdown experiments were carried out for a horizontal copper straight tube with the inner diameter of 0.7 mm and the length of 1000 mm. Boiling inception points were measured form wall temperature profiles, and critical mass flow rates were measured. The condition when a flow became to critical flow was specified by changing the exit pressure. As the results, for the inlet subcooling conditions, a boiling delay with thermal non-equilibrium around the boiling inception point was not observed. In this case, measured temperature profiles agreed well with numerical calculation results based on homogenous model.The Japan Society of Mechanical Engineers, 16 Nov. 2012, Procee[d]ings of Thermal Engineering Conference, 2012, 9 - 10, Japanese
- D202 Measurements of Water Distributions in In-plane Direction of a PEFC by using Neutron Radiography and Analysis of Gas-velocity Distributions in the Channel and the GDLVisualization and measurement of water distributions in a polymer electrolyte fuel cell (PEFC) were carried out by means of neutron radiography for clarifying water effects on the performances. The two-dimensional water distributions were applied for a network model. It analyzes the gas-velocity distributions depending on the local pressure drop which is affected by the gas-flow rate and the water accumulation. Formation of the accumulated water in the channel was assumed based on measurement results of water distributions in through-plane direction. Furthermore, it was estimated that maximum water accumulation in the gas diffusion layer (GDL) and mechanism of water discharge from the GDL to the channel. From the analysis results, change of gas-velocity distributions depending on the water accumulation in the PEFC could be obtained.The Japan Society of Mechanical Engineers, 20 Jun. 2012, National Symposium on Power and Energy Systems, 2012(17) (17), 341 - 344, Japanese
- 日本機械学会, Apr. 2012, 日本機械学会熱工学部門ニュースレター, (66) (66), Japanese宇宙構造物用二相流体ループ式排熱システムの開発 －国際宇宙ステーションでの実験に向けて－[Refereed]Introduction other
- 日本冷凍空調学会, 2012, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A311 - 1-4, JapaneseStudy of the effect of refrigerant flow behavior on heat transfer performance of a single channel plate-fin heat exchanger
- 日本冷凍空調学会, 2012, 日本冷凍空調学会年次大会講演論文集 Proceedings of the JSRAE Annual Conference, A234 - 1-4, EnglishComparison between Homogeneous, Separated and Drift Flux Two Phase Flow Models for Adiabatic Capillary Tube Flow in a Transcritical CO₂ Heat Pump
- C226 Study of Heat Transfer and Flow Characteristics of Gas-Liquid Two-Phase Flow in Plate-Fin Heat ExchangerIn the case that a plate heat exchanger is used as an evaporator, the heat transfer performance may strongly depend on the flow behavior of gas-liquid two-phase flow. The FC-72 boiling heat transfer characteristics with hot water heating were examined for a single-channel plate fin heat exchanger with an offset fin. Heat transfer rate increased with increasing the flow rate of hot water, however the amplitude seemed to be saturate in high flow rate condition of hot water in spite of the decrease in the effectiveness in the heat exchange. The reason might be on the heat transfer deterioration in the refrigerant flow due to the flow pattern of boiling two-phase flow.The Japan Society of Mechanical Engineers, 28 Oct. 2011, Procee[d]ings of Thermal Engineering Conference, 2011, 281 - 282, Japanese
- The Japan Society of Mechanical Engineers, 19 Sep. 2011, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2011(10) (10), "OS21 - 1-5-1", EnglishOS21-1-5 Microgravity Experiments during a Parabolic Flight of Airplane on One-Component Two-Phase Flow Characteristics
- Aug. 2011, 日本混相流学会年会講演会講演論文集, 2011, 110 - 111, Japanese微小重力下におけるポンプ駆動二相流体ループの熱流動特性(断熱二相流の流動特性)
- Aug. 2011, 日本混相流学会年会講演会講演論文集, 2011, 106 - 107, Japanese微小重力下におけるポンプ駆動二相流体ループの熱流動特性(重力の変化に対する二相流体ループの応答特性)
- G207 Measurement of water distribution by using neutron radiography and network analysis of gas-velocity distributions in a PEFCFuel gas (hydrogen gas) and oxidant gas (air) are supplied to a Polymer Electrolyte Fuel Cell (PEFC). Condensation may occur in the cathode side, since air is super-saturated by the fuel cell reactions. If condensed water exists in a gas diffusion layer (GDL) or the gas channels, it may affect the fuel cell performances because of blocking the oxygen from reaching the cathode reaction site. In order to clarify water effects on performances of a PEFC, visualization and quantitative measurements of water distributions in a PEFC were carried out by means of neutron radiography. A network analysis of gas-velocity distribution was applied for the experimental results. It analyzes the gas-velocity distribution depending on the flow resistance which is the pressure drop. Applying the measured data of water thickness, pressure drop in the gas channel and the GDL can be obtained.The Japan Society of Mechanical Engineers, 22 Jun. 2011, National Symposium on Power and Energy Systems, 2011(16) (16), 457 - 460, Japanese
- H214 A Cogeneration System for an Apartment Building using Distributed Heat Storage TechnologyIn order to spread economically viable distributed generation systems for apartment buildings, it is essential to develop an efficient and low-cost heat supply system. We are developing a new cogeneration system (Neighboring Co-Generation system: NCG). The key concept of this system is to install a heat storage unit with a hot water supply and a room heating function at each household and to connect heat storage units by a single-loop hot water pipe. In this study, a dynamic simulator was developed on the NCG system with solar heat utilization, and the environmental load reduction effects of solar heat utilization in the system were evaluated under the condition satisfying the whole heat demand. The simulated results for the system of 50 households showed that the annual use of the primary energy was reduced by 18% in the case that a gas engine was used as the main generator. When a SOFC system with the higher thermal efficiency was installed, the reduction ratio increased to 29%.The Japan Society of Mechanical Engineers, 22 Jun. 2011, National Symposium on Power and Energy Systems, 2011(16) (16), 507 - 508, Japanese
- G206 Three-Dimensional Visualization and Measurement of Water Distributions in PEFC by Dynamic CT Method on Neutron RadiographyVisualization of dynamic three-dimensional water behavior in a PEFC stack was carried out by neutron CT for clarifying water effects on performances of a Polymer Electrolyte Fuel Cell (PEFC) stack. Neutron radiography system at JRR-3 in Japan Atomic Energy Agency was used. An operating stack with three cells based on Japan Automobile Research Institute standard was visualized. A consecutive CT reconstruction method by rotating the fuel stack continuously was developed by using a neutron image intensifier and a C-MOS high speed video camera. The dynamic water behavior in channels in the operating PEFC stack was clearly visualized 15 sec in interval by the developed dynamic neutron CT system. From the CT reconstructed images, evaluation of water amount in each cell was carried out. It was shown that the water distribution in each cell was correlated well with power generation characteristics in each cell.The Japan Society of Mechanical Engineers, 22 Jun. 2011, National Symposium on Power and Energy Systems, 2011(16) (16), 453 - 456, Japanese
- The Japan Society of Mechanical Engineers, 19 Mar. 2011, 関西支部講演会講演論文集, 2011(86) (86), "13 - 34", Japanese1328 Study on Freezing Phenomenna of Water in a Porous Layer Used as Gas Diifusion Layer in PEFC
- 2011, 宇宙科学技術連合講演会講演集(CD-ROM), 55th, ROMBUNNO.2G09, Japanese「きぼう」での沸騰二相流実験に向けた地上実験ループにおける熱伝達特性の解明
- Jul. 2010, 日本混相流学会年会講演会講演論文集, 2010, 220 - 221, Japanese単一細管内強制流動沸騰熱伝達における力の支配領域の解明
- B106 Energy Saving Effect of a Cogeneration System for an Apartment Building Using Distributed Heat Storage TechnologyIn order for economically viable distributed generation systems for apartment buildings to spread, it is essential to develop an efficient and low-cost heat supply system. We are developing a new cogeneration system (Neighboring CoGeneration: NCG). The key concept of this system is to install a heat supply unit with a hot water supply and a room heating function at each household and to connect different households by a single-loop hot water pipe. As a result, time leveling of the heat supply and heat transferring among households become possible. Thus, the costs of the piping and the heat source equipment decrease. Furthermore, because all the heat supply units store heat, the total heat storage capacity is large enough for cogeneration to generate according to the electricity demand and with high operating rate. In this paper, we reported the evaluation of the performance of the heat supply and the energy saving effect of NCG system for 50 households in winter by the dynamic simulation.The Japan Society of Mechanical Engineers, 20 Jun. 2010, National Symposium on Power and Energy Systems, 2010(15) (15), 55 - 56, Japanese
- D202 Visualization of Water Distribution in PEFC by using Neutron Dynamic CTFuel gas (hydrogen gas) and oxidant gas (air) are supplied to a Polymer Electrolyte Fuel Cell (PEFC) in saturated moist condition to keep a membrane wet. Condensation may occur in the cathode side, since the air is super-saturated by the fuel cell reaction. If the condensed water stay in an electrode, Gas Diffusion Layer (GDL) or gas channels, it may affect on the fuel cell performance. In this study, dynamic CT technology which performed 1 CT per 1 sec was developed, and visualization of three-dimensional water distributions in an operating PEFC was measured by using neutron dynamic CT. As a result, it was confirmed that the developed system can measure three-dimensional water distribution in the PEFC and, condensed water had a significant influence on the fuel cell performances.The Japan Society of Mechanical Engineers, 20 Jun. 2010, National Symposium on Power and Energy Systems, 2010(15) (15), 381 - 384, Japanese
- 日本伝熱学会, 01 Apr. 2010, Journal of the Heat Transfar Society of Japan, 49(207) (207), 40 - 42, JapaneseReport of International Conference on Power Engineering 2009 (ICOPE-09)
- 日本非破壊検査協会, 01 Mar. 2010, 非破壊検査 : journal of N.D.I, 59(3) (3), 106 - 109, JapaneseDevelopment of Neutron Dynamic CT System
- Mar. 2010, 宇宙利用シンポジウム, 26th, 41 - 44, Japanese国際宇宙ステーション「きぼう」での強制流動沸騰実験に向けたBBMの開発
- Mar. 2010, 宇宙利用シンポジウム, 26th, 49 - 52, Japanese単一細管内沸騰二相流の熱伝達係数に対する力の支配領域の特定に関する実験的研究
- 2010, 宇宙科学技術連合講演会講演集(CD-ROM), 54th, ROMBUNNO.2J04, Japaneseきぼう利用実験「沸騰二相流体ループにおける気液界面挙動と熱伝達特性」における地上検証用ループ試験
- 2010, 日本伝熱シンポジウム講演論文集(CD-ROM), 47th, ROMBUNNO.H123, Japanese単一細管内の強制流動沸騰熱伝達に及ぼす管径の影響
- 日本混相流学会, 15 Dec. 2009, Japanese journal of multiphase flow, 23(4) (4), 447 - 450, JapaneseMultiphase Thermo-Fluid Dynamics of Dept. of Mechanical Eng. in Kobe University
- D141 Measurement of Distribution of Water of Thickness Direction in PEFC by Neutron RadiographyThis paper presents a new measurement technique of neutron radiography for fuel cell researches. Water condenses in MEA, GDL and channel in cathode side of PEFC (Polymer Electrolyte Fuel Cell) while PEFC generates electricity. It is expected the condensed water may decrease power generation capability. Visualization of the condensed water behavior is important to study the fuel cell and neutron radiography is effective for the visualization. A borescope system was introduced into neutron radiography to visualize water of thickness in the MEA and the GDL. Borescope system enables neutron radiography to take a picture pixel size of which is 6.5μm and to measure water of thickness in the MEA and the GDL with the exposure time of 50 seconds.The Japan Society of Mechanical Engineers, 06 Nov. 2009, Procee[d]ings of Thermal Engineering Conference, 2009, 111 - 112, Japanese
- 19 Oct. 2009, JASMA : Journal of the Japan Society of Microgravity Application, 26(4) (4), 377 - 377, EnglishDevelopment of BBM for the Experiments on Boiling and Two-phase Flow onboard Japanese Experiment Module "KIBO" in International Space Station
- 19 Oct. 2009, JASMA : Journal of the Japan Society of Microgravity Application, 26(4) (4), 355 - 355, EnglishOn the Dominant Force Regime Map for Flow Boiling Heat Transfer in a Single Mini-tube
- Oct. 2009, 日本マイクログラビティ応用学会誌 JASMA, 26, 3, pp.213-217, JapaneseProposal of Microgravity Experiments on Forced Convection Boiling in OrbitIntroduction scientific journal
- 化学工業社, Sep. 2009, ケミカルエンジニヤリング, 54(9) (9), 682 - 686, Japaneseプレート熱交換器内沸騰二相流に及ぼす流れ方向の影響 (特集 混相流技術の可能性を拓く)
- C213 Study on Central Heat Supply System for Multiple Dwelling HousesIn order for economically viable distributed generation systems for local community to spread, it is essential to develop an efficient and low-cost heat supply system. For this purpose, we are proposing a new heat supply system. The key technology for the system is to connect compact heat supply units with hot water heat storage tank installed in each house by a single loop hot water piping. It is expected that flow rate of hot water supply can be reduced by using distributed heat storage. The effect leads to reduction in pipe diameter, heat loss and pump power. In this study, to confirm the effect on leveling heat transfer rate through the main pipe, a dynamic simulator for heat supply system to 50 households was developed, and the effect of operation mode and capacity of distributed heat storage was evaluated.The Japan Society of Mechanical Engineers, 28 Jun. 2009, National Symposium on Power and Energy Systems, 2009(14) (14), 349 - 350, Japanese
- The Japan Society of Mechanical Engineers, 16 Mar. 2009, 関西支部講演会講演論文集, 2009(84) (84), "5 - 25", Japanese519 Study of hot water supply system for Multiple Dwelling Houses
- The Japan Society of Mechanical Engineers, 16 Mar. 2009, 関西支部講演会講演論文集, 2009(84) (84), "1 - 1", Japanese101 Study for a Enable Distributed Energy Supply System with a Heat Storage Linkage
- 05 Mar. 2008, エネルギー・資源, 29(2) (2), 124 - 125, JapaneseInternational Conference on Power Engineering 2007 in Hangzhou, China
- 日本混相流学会, 15 Dec. 2007, Japanese journal of multiphase flow, 21(4) (4), 453 - 455, JapaneseReport on International Conference on Power Engineering 2007 (ICOPE-07)
- 日本混相流学会, 15 Dec. 2007, Japanese journal of multiphase flow, 21(4) (4), 397 - 404, JapaneseMulti-phase Flow in a Polymer Electrolyte Fuel Cell : Visualization and Measurement by Neutron Radiography
- F124 A Study on Compactification of Latent Heat Recovery Heat Exchanger for Gas Water HeaterRecently, the reduction in CO_2 emissions is taken up as a worldwide problem. For household gas water heater, improvement in the thermal efficiency by latent heat recovery from the exhaust gas is required. In this report, a compact vertical tube bank heat exchanger was designed by a numerical analysis based on analogy of heat and mass transfer. It is expected that the designed heat exchanger improve the HHV based thermal efficiency 12.8%. Two prototypes using SUS smooth tubes with 8 and 6mm O.D. had been manufactured and tested.The Japan Society of Mechanical Engineers, 23 Nov. 2007, Procee[d]ings of Thermal Engineering Conference, 2007, 205 - 206, Japanese
- 日本アイソトープ協会, 15 Sep. 2007, Radioisotopes, 56(9) (9), 585 - 591, JapaneseApplication of Neutron Imaging to Fluid Engineering-2
- 日本アイソトープ協会, 15 Aug. 2007, Radioisotopes, 56(8) (8), 487 - 493, JapaneseApplication of Neutron Imaging to Fluid Engineering-1
- OS5-3 Visualization and Measurement of Water Distribution in PEFC by Neutron RadiographyHydrogen gas and air are supplied in saturated moist condition to keep a membrane wet in a polymer electrolyte fuel Cell. Condensation may occur in the cathode side, since air is super-saturated by the fuel cell reaction. The condensed water may affect on the fuel cell performance. Water distributions in the operating PEFC were visualized by neutron radiography with measuring the cell voltage. A single cell with an electrode area of 25cm^2 were used in the visualization tests. Dynamic water behaviors were visualized by using neutron image intensifier, and recorded as video images. In order to measure water amount with high resolution, a cooled CCD camera with 16bit intensity levels were used, and still images were recorded. From the still images, water amount in the PEFC could be measured with a spatial resolution of 107μm quantitatively. The correlations between the water distribution and cell voltage fluctuations for three types of separator channels were clearly shown.The Japan Society of Mechanical Engineers, 13 Jun. 2007, National Symposium on Power and Energy Systems, 2007(12) (12), 255 - 258, Japanese
- OS4-5 Study of Heat Supply System Using Distributed Heat Storage Unit for a Multiple Dwelling HousesIn order to spread for economically viable distributed co-generation systems for local community, it is essential to develop an efficient and low-cost heat supply system. We propose a new heat supply system using distributed heat storage unit by which heat supply rate can be reduced, since the heat storage covers large fluctuation in heat demand for each house. The system is named DREAMS (Distributed Residential Energy with Advanced Management System). In this system, shortage of heat in hot water supply is covered by direct supply of hot water from the main loop. Numerical simulation model of the DREAMS was constructed by utilizing a commercial process simulator. Heat supply performance to a heat demand of 50 households was simulated for an actual measurement value of heat demands in January from consumer survey data by Osaka Gas.The Japan Society of Mechanical Engineers, 2007, National Symposium on Power and Energy Systems, 181 - 182, Japanese
- B213 A Study of Thermal Hydraulic Characteristics of a Paraffin EmulsionThis study deals with thermal hydraulic characteristics of a paraffin emulsion, in which a paraffin wax with a melting point of 72℃ and latent heat of 222kJ/kg was used as phase change material. Pressure loss and heat transfer coefficient in a cooling process were measured for a horizontal copper tube with inner diameter of 4mm. As a result, it was shown that heat transfer performance of paraffin emulsion was lower than that of water, because of its high viscosity and a delay in phase change of paraffin wax. Paraffin emulsion at the exit of heating section was in a thermal non-equilibrium condition, and recovery of temperature after mixing was observed.The Japan Society of Mechanical Engineers, 23 Nov. 2006, Procee[d]ings of Thermal Engineering Conference, 2006, 259 - 260, Japanese
- E111 Boiling Heat Transfer Characteristics in Rapid Heating for a Cold-Plate with Thermal Spray CoatingThis study deals with boiling heat transfer enhancement for a narrow channel by thermal spray coating. Aluminum powder was coated on the heating surface by vacuum plasma spraying. Wall superheats at the onset of boiling and steady condition were evaluated in flow boiling of R123 with inlet subcooling for mass fluxes of 125, 188, and 313kg/(m^2・s), inlet subcooling of 10, 15, and 20, and heat flux 62-365kW/m^2. The test channel with the channel gap of 2mm, channel width of 20mm, and heated length of 100mm was placed vertically and heated on one side by ceramic plate heaters. As the result, it was shown that the coating surface could make wall superheat at the onset of boiling lower and critical heat flux higher than a smooth surface.The Japan Society of Mechanical Engineers, 23 Nov. 2006, Procee[d]ings of Thermal Engineering Conference, 2006, 149 - 150, Japanese
- The Japan Society of Mechanical Engineers, 17 Mar. 2006, 関西支部講演会講演論文集, 2006(81) (81), "7 - 7", Japanese707 Visualization and Void Fraction Distribution of Gas-Liquid Two-phase Flow in a Vertical Multipath Tube
- 26 Jan. 2006, エネルギーシステム・経済・環境コンファレンス講演論文集 = Proceedings of the ... Conference on Energy, Economy, and Environment, 22, 93 - 96, JapanesePerformance Evaluation of a Compact Hot Water Supply Unit with Hybrid Heat Storage for Neighboring Communities Co-generation System
- 28 Nov. 2005, JASMA : Journal of the Japan Society of Microgravity Application = 日本マイクログラビティ応用学会誌, 22(4) (4), 275 - 275, EnglishA Study of Nucleation and Detachment of Vapor Bubbles on Boiling Heat Transfer Enhancement Surface with a High Wettability Microstructure
- F155 A Study on the Performance Characteristics of a Smooth-Tube Bank Heat Exchanger for Latent Heat RecoveryIn order to improve thermal efficiency of a gas water heater, an additional heat exchanger is required for latent heat recovery from the exhaust gas. In this study, two types of smooth-tube bank heat exchanger with a staggered and inline tube arrangement were installed to a commercial hot water heater with the output of 34.8kW, and the performance was evaluated under a normal using condition. The experimental results were compared with numerical results by a model based on the analogy between heat and mass transfer. The tested heat exchanger satisfied the required performance, which is a thermal efficiency of 89% based on HHV. Experimental results of heat transfer rate showed higher values than the numerical results, though those of condensing rate showed lower values.The Japan Society of Mechanical Engineers, 02 Nov. 2005, Procee[d]ings of Thermal Engineering Conference, 2005, 253 - 254, Japanese
- Oct. 2005, Journal of the Japan Society of Mechanical Engineers, 108, 1042, 724-725, Japanese微小重力下での気液二相流のふるまい（依頼寄稿）Introduction scientific journal
- The Japan Society of Mechanical Engineers, Sep. 2005, Journal of the Japan Society of Mechanical Engineers, 108(1042) (1042), 724 - 725,図巻頭4, JapaneseGas-Liquid Two-Phase Flow Behavior under Microgravity
- Apr. 2005, 日本精蝋㈱平成16年度共同研究成果報告書, Japaneseワックス系蓄熱材の蓄熱特性に関する研究[Refereed]Others
- Quantitative void fraction measurement method by neutron radiography was developed using a neutron absorber grid based on an umbra method. The cross-sectionally averaged void fraction for various flow patterns in air-water two-phase flow in a tube was measured quantitatively. Uncertainty analyses were carried out for the measured values and the accuracy of the measurement was discussed for each flow pattern. Experimental results agree well with the prediction by drift flux model. The quantitative measurement method was applied to two-phase flow in a concentric annular tube, a tube with a spiral wire, a rod bundle, a capillary tube and a plate fin heat exchanger. The CT reconstruction method was applied to measure the quantitative void fraction distributions in the cross section. (C) 2004 Elsevier Inc. All rights reserved.ELSEVIER SCIENCE INC, Mar. 2005, EXPERIMENTAL THERMAL AND FLUID SCIENCE, 29(3) (3), 393 - 402, English[Refereed]Others
- Adiabatic air-water two-phase flows in a commercial plate heat exchanger were visualized by thermal neutron radiography method as a nondestructive test in order to clarify liquid distributions. Liquid distributions in a single channel and a multichannel plate heat exchanger were investigated. From the results of a single channel, it was shown that gas phase tended to flow at the center of the net-like conduit and liquid fraction at the both side was higher. However, in the case of higher gas volumetric flux above 19 m/s, liquid distributions seemed to be homogenous. Measured average void fractions were lower than those by the homogenous model. On the other hand, from the results of a multichannel, it was shown that liquid distribution into the each channel strongly depended on inlet conditions. In the case of higher liquid flow rate and lower gas flow rate, liquid fraction became higher with the deeper channel due to larger liquid momentum. However, in the case of lower liquid flow rate and higher gas flow rate, the opposite tendency of liquid distribution was observed, that is to say, liquid fraction was lower with the deeper channel.IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Feb. 2005, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 52(1) (1), 280 - 284, English[Refereed]Others
- 2005, （独）宇宙航空研究開発機構平成16年度共同研究成果報告書, Japanese冷媒循環式衛星熱制御デバイスの信頼性向上・評価の研究Ⅰ－潜熱利用流体ループ式排熱システムの動特性及び制御に関する研究－[Refereed]Others
- 2005, （独）宇宙航空研究開発機構平成16年度共同研究成果報告書, Japanese冷媒循環式衛星熱制御デバイスの信頼性向上・評価の研究Ⅰ－宇宙用排熱ループにおけるアキュムレーター制御特性に関する研究－[Refereed]Others
- 2005, （独）宇宙航空研究開発機構平成16年度共同研究成果報告書, Japanese冷媒循環式衛星熱制御デバイスの信頼性向上・評価の研究Ⅰ－キャピラリーポンプループの性能向上に関する研究－[Refereed]Others
- 2005, 大阪ガス㈱、㈱ノーリツ、住友精密工業㈱平成16年度共同研究成果報告書, Japanese潜熱蓄熱器の評価研究[Refereed]Others
- 2005, Neutron Radiography (7),Edited by P.Chirico and R.Rosa, 789-798, EnglishImage Processing Methods to Obtain Cross-Sectional Void Fraction Distribution of Gas-Liquid Two-Phase Flow from a Projaction Image by neutron Radiography[Refereed]Others
- 609 Development of New Heat Supply Unit Using Latent Heat StorageThe high efficient co-generation system named "Neighboring Communities Co-generation System" is proposed to a multiple dwelling house. The key technology of this system is to connect home and home with one loop of heat transfer line of one inch diameter, and to level the heat demand by a heat storage unit in each house. This system require compact and high response heat storage unit. In this study, a plate fin type brazing heat exchanger was applied and tested for a heat storage unit. Sodium acetate trihydrate with a melting point of about 58 ^ΩC and paraffin wax with a higher value of 74.8 ^ΩC were used as the phase change material (PCM). As a result, it was shown that the heat transfer in the heat storage unit was dominated by thermal conductivity in PCM. Paraffin wax made higher responsibility and higher heat output due its higher melting point and quite small super cooling in solidification.The Japan Society of Mechanical Engineers, 17 Mar. 2004, 関西支部講演会講演論文集, 2004(79) (79), "6 - 17"-"6-18", Japanese
- Mar. 2003, 電源開発，大阪ガス，ノーリツ，積水化学工業，帝国電機製作所，シンセイ冷却システム 平成14年度共同研究成果報告書, 未記入, Japanese分散電源対応民生用熱供給システムの研究開発Others
- 東京大学原子力研究総合センター, 2003, 原研施設利用共同研究成果報告書, (43) (43), 129 - 140, Japanese中性子ラジオグラフィによる機械内部の熱流動現象の定量的計測 (中性子利用分析・中性子ラジオグラフィによる構造解析(N.R.G))
- Preparation for the Introduction of Neighboring Communities GenerationThe cost down of the electric power and city gas has been realized because of the active promotion of the deregulation in the energy business. From the viewpoint of global environment problem and economic slump, the technical innovation is desired to enable to abate emission of CO2 and to create the new jobs. The high efficient distributed generation system such as a SOFC or a MCFC hybrid is created to present the comfortable and high quality living environment, using combined heat information and power (CHIP) technologies. The key technology of this proposed system is to connect the home and home for one loop of heat transfer line and level the demand of heat consumption using the heat storage systems in the neighboring communities with high efficiency that the stand alone home-use cogeneration system. And the inner diameter of this heat transfer line is only one inch. Using this key technology, this constant heat output can supply about twenty houses in case of Hokkaido area or over sixty houses in case of Kansai area even in winter season because of the sharing of the instantaneous hot water supply demand by the cooperation of the neighboring communities. Sodium acetate with three hydrate or paraffin is used as the phase change material (PCM) for the heat storage systems. At present, to produce on the commercial basis of this system, the academic, companies, and governmental circles composed mainly of the Kansai area have been developed to verify the control logic for leveling the heat duty of mainly heating feed water. This paper presents the concept of this neighboring communities generation (NCG) system compared with the ordinary heat and power supply system and the test result of New Heat Supply Unit (NHSU).The Japan Society of Mechanical Engineers, 2003, Procee[d]ings of Thermal Engineering Conference, 475 - 476, Japanese
- A Study of Water Hammer Phenomena caused by Steam flow to Drain PipingThe pressure change and the accompanying fluid vibration occurs due to the water hammer phenomena caused by the steam condensation and sometimes lead to the damage of the pipings. This purpose is to study the water hammer phenomena caused by the steam condensation in a drain pipe. In general, the steam flashed from the steam trap flows into the drain pipe filled with water. In this case, the water hammer phenomena caused by the steam condensation occurs. Here, the steam from a boiler is injected into the drain pipe which is filled with water. The behavior of the steam condensation was taken by the high-speed camera. The correlation between the magnitude of the sudden pressure rise and the size of the steam bubble is investigated.The Japan Society of Mechanical Engineers, 2003, 関西支部講演会講演論文集, 2003(78) (78), "8 - 13"-"8-14", Japanese
- A Development of Accumulator Driven by Gas Pressure for Thermal Control System in SpaceA lot of heat treatment in space poses a problem with development of space development of the thermal control system in recent years, the loop-type exhaust heat system utilizing the latent heat is paid attention. This system enabled a lot of heat treatment and long-distance heat transportation compared with the heat pipe system and made thermal control possible by controlling the pressure of the accumulator and changing the temperature of the working fluid. Then, higher efficiency of the accumulator and changing the temperature of the working fluid. Then, higher efficiency of the accumulator is desired as the pressure control device. In this study. The experiments of an accumulator is carried out aiming development of a higher efficient device.The Japan Society of Mechanical Engineers, 2003, 関西支部講演会講演論文集, 2003(78) (78), "8 - 5"-"8-6", Japanese
- A Study of the Influence of Air Mixing and the Orifice on the Water Hammer Phenomenon in a Branch PipeThe water hammer phenomenon occurs in water supply piping in common residence and building due to the sudden valve closure of one-touch lever. What was more excellent in both cost and the construction is desired as the device. In this study, the erection branch pipe of the different diameters is installed in a horizontal pipeline as a model of a water hammer absorber, and the effects of the air mixing and the orifice on the water hammer phenomenon are investigated.The Japan Society of Mechanical Engineers, 2003, 関西支部講演会講演論文集, 2003(78) (78), "7 - 43"-"7-44", Japanese
- A Study of the Phase Separation Characteristics of Gas-Liquid Two-Phase Flow in T and Y-junctionThe purpose of this study is to develop phase separation equipment using a simple impacting T or Y-junction for gas-liquid two-phase flow under microgravity. In order to clarify the effect of tube diameter on the phase separation performance, phase separation experiments in the T (θ=90°) and Y (θ=60°, 30°) junctions of 4 mm ID set in a horizontal plane were carried out using air and water as the working fluids. Moreover, the effect of the flow direction of the inlet flow was evaluated. The phase separation performance was also improved by decreasing of the angle θ between the inlet and the side branch as well as our previous results on junction of 10 mm ID. However, phase separation was not performed for the high gas velocity condition in which the inlet flow regime was an annular flow.The Japan Society of Mechanical Engineers, 2003, 関西支部講演会講演論文集, 2003(78) (78), "14 - 29"-"14-30", Japanese
- A Dvelopment of Pump-Driven Type Mechanical Accumulator for utilizing Latent Heat Flow Thermal Control SystemsA two-phase flow thermal control system, which utilizes the latent heat of fluid, is paid attention for the heat romoval in the space station and the Space Solar Power System. The characteristic is that the temperature can be controlled by changing pressure in the accumulator. But a new development of this kind of accumulator is demanded for this system. We proposed the pump-driven type accumulator. As a result of various experiments, it is shown that the pump-driven type accumulator is adequate to change the pressure and the temperature of the two-phase flow loop system.The Japan Society of Mechanical Engineers, 2003, 関西支部講演会講演論文集, 2003(78) (78), "8 - 17"-"8-18", Japanese
- 2003, 電源開発，大阪ガス，ノーリツ，積水化学工業，帝国電機製作所，シンセイ冷却システム 平成14年度共同研究成果報告書, 未記入, Japanese分散電源対応民生用熱供給システムの研究開発Others
- 2003, 伝熱, 42(172), 31-32(172) (172), 31 - 32, Japanese神戸大学におけるものづくり教育と学生実験Others
- 2003, (財)宇宙開発事業団 平成14年度共同研究成果報告書, 未記入, Japaneseハイブリッド式流体ループの流熱制御技術研究Others
- 日本混相流学会, 15 Jun. 2002, Japanese journal of multiphase flow, 16(2) (2), 145 - 147, JapaneseStay at University of Stuttgart
- Dynamic Characteristics of a Two-phase Flow Thermal Control SystemIt is important to make clear dynamic phenomena of the two-phase active thermal control system for the space application. A small capacity of experimental apparatus was built and the dynamic characteristics were investigated experimentally. They also were compared with the results of the theoretical numerical simulation. Both agreed well qualitatively.The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "11 - 19"-"11-20", Japanese
- 京都大学原子炉実験所, Oct. 2001, KURRI-KR, (70) (70), 111 - 121, Japaneseプレート熱交換器内気液二相流の可視化と計測 (「中性子ラジオグラフィ高度技術の開発と応用」専門研究会(平成13年度))
- A study on the Improvement of the absorption cycle performanceIt is necessary to use waste heat from thermal engines effectively for promotion of effective use of energy. Although hot water supply, space heating and so on are raised as heat directions, the amount of use is restricted in summer. However, absorption cycle driven by waste heat is useful for that purpose. The purposes of this study are to improve a coefficient of performance (COP) for water / lithium bromide absorption system, and to evaluate the feasibility for use of various waste heat sources. And, the some of results obtained by this study are as follows. (1) Energy analysis in the absorber and generator in which heat transfer and other unit operation exist was performed, and some findings were obtained. (2) In the double-effect absorption cycle, COP and exergy efficiency was calculated and the cycle evaluation was performed. (3) Some of improved cycles for double-effect absorption system were examined to clarify the advantages.The Japan Society of Mechanical Engineers, 09 Jul. 2001, Symposium on Environmental Engineering, 2001(11) (11), 544 - 545, Japanese
- 神戸大学, Mar. 2001, 神戸大学大学院自然科学研究科紀要. B, 19, 119 - 127, Japanese臭化リチウム-水吸収冷凍機のエクセルギー解析 : (三重効用型サイクル及びハイブリッドシステムの検討)
- 可視化情報学会, Jul. 2000, 可視化情報学会誌, 20(1) (1), 329 - 332, Japanese中性子ラジオグラフィによるボイド率分布の定量的計測法 (第28回 可視化情報シンポジウム講演論文集) -- (オーガナイズドセッション:放射線による可視化と計測(1))
- 可視化情報学会, Jul. 2000, 可視化情報学会誌, 20(1) (1), 335 - 338, Japanese中性子ラジオグラフィによる冷凍機内冷媒流れの可視化とボイド率計測 (第28回 可視化情報シンポジウム講演論文集) -- (オーガナイズドセッション:放射線による可視化と計測(2))
- 124 A Study on the Performance Characteristics of a Hybrid-type LiBr Absorption RefrigeratorIt is important to use the waste heat efficiently for energy saving. An absorption refrigerator is efficient as the thermal utilizing equipment of the waste heat. Multi-effect absorption refrigerator is efficient to the improvement of the performance, but it needs higher temperature heat source than single-effect. In order to decrease heat source temperature, a hybrid system with a steam compressor at the exit of low temp. regenerator is supposed. In this paper, we report calculated results on the performance characteristics of the hybrid-type double-effect absorption refrigerator.The Japan Society of Mechanical Engineers, 16 Mar. 2000, 関西支部講演会講演論文集, 2000(75) (75), "1 - 47"-"1-48", Japanese
- 神戸大学, Mar. 2000, 神戸大学大学院自然科学研究科紀要. B, 18, 71 - 79, Japanese臭化リチウム─水吸収式冷凍機のエクセルギー解析
- 東京大学原子力研究総合センター, 2000, 原研施設利用共同研究成果報告書, (40) (40), 201 - 203, Japanese熱中性子ラジオグラフィによる熱流動現象の可視化と計測 (一般共同研究・一般協力研究) -- (中性子利用分析・中性子ラジオグラフィーによる構造解析)
- E111 Characteristics of Heat Transfer and Critical Heat Flux of Flow Boiling in a Vertical Tube with a Wire Coil(Critical heat flux) :The boiling heat transfer and the critical heat flux characteristics were experimentally investigated in a SUS316 vertical tube with a Teflon-coated wire coil of various wire diameters and pitches by using HCFC-123 as the working fluid. The tube wall was uniformly heated by a DC current. The experimental conditions were a mass flux G=200-400 kg/m^2s and a thermal equilibrium quality at the exit of the tube x_日本機械学会, 2000, Proceedings of the ... JSME-KSME Thermal Engineering Conference, 1, "1 - 439"-"1-444", English
=0.1-0.8. The values of the boiling heat transfer coefficients in the tube with a wire coil were almost equal to those in a smooth tube in the nucleate boiling region, but a little enhancement of the heat transfer was observed in the forced convective evaporation region. The critical heat fluxes in the tube with a wire coil were larger than those in the smooth tube in the higher quality region. - 可視化情報学会, 01 Jul. 1997, Journal of the Visualization Society of Japan, 17, 57 - 58, JapaneseThree-Dimensional Void Fraction Distribusion of Steady Gas-Liquid Two-Phase Flow by Neutron Radiography
- 可視化情報学会, 01 Jul. 1997, Journal of the Visualization Society of Japan, 17, 59 - 60, JapaneseVisualization of Liquid Metal Flow by Neutron Radiography
- Kobe University, 22 Dec. 1996, Memoirs of the Faculty of Engineering, Kobe University, 43, 101 - 109, EnglishTransient Characteristics of Vapor Flow with Evaporating and Condensing in a Closed Vessel
- 日本ヒ-トパイプ協会, Jul. 1996, ヒ-トパイプ技術, 15(3) (3), 16 - 20, Japanese蒸発・凝縮系の気体力学的起動特性
- Performance Characteristics of Hero's Turbine Using Hot Water as a Working FluidFrom the viewpoint of energy conservation and the development of new energy resources, it is important to utilize geothermal resources and waste heat from factories. Among energy conversion device, there is a radial outflow reaction turbine, i.e., Hero's turbine. Performance characteristics of Hero's turbine are analytically and experimentally clarified for flashing expansion of initially subcooled hot water. It is found that: (a) there is an optimum number of revolutions at which maximum turbine efficiency can be obtained; (b) Hero's turbine internal efficiency can be expressed as an algebraic equation and (c) nozzle loss accounts for almost 90% of the total turbine loss.The Japan Society of Mechanical Engineers, Feb. 1992, The Japan Society of Mechanical Engineers, Series II, 35, 319 - 324, English
- Editor, Elsevier, 2021, English, ISBN: 9780128203606Advances in power boilers
- Joint work, Fundamentals for power engineering, Elsevier, 2021, English, ISBN: 9780128207338Fundamentals of thermal and nuclear power generation
- Joint work, Elsevier, 2017, English, ISBN: 9780081010105Boiling -Research and Advances - （分担執筆：6.9 Heat Transfer Enhancement and the Effect of Gravity in Boiling Phenomena）Scholarly book
- Joint work, S&T出版, Aug. 2015, Japanese, ISBN: 9784907002473PEFCの内部現象・反応機構と評価・解析技術，（分担執筆：第5章 第2節「中性子ラジオグラフィによる発電時のPEFC内水輸送現象の可視化と計測」Scholarly book
- Joint work, 日本冷凍空調学会, Mar. 2015, Japanese, ISBN: 9784889671261日本冷凍空調学会専門書シリーズ 測定器の取扱方法Scholarly book
- Joint work, 日本機械学会, Jul. 2013, Japanese, ISBN: 9784888982320東日本大震災合同調査報告 -機械編-Report
- Joint work, コロナ社, May 2013, Japanese, ISBN: 9784339046236エネルギー変換論入門Textbook
- Joint work, コロナ社, Nov. 2008, Japanese熱移動論入門Textbook
- Joint work, 日本機械学会編, コロナ社, May 2006, Japanese改訂気液二相流技術ハンドブックScholarly book
- 日本マイクログラビティ応用学会第33回学術講演会 (JASMAC-33), Oct. 2021, Japanese国際宇宙ステーション沸騰・二相流実験で得られた観察部での気液界面構造の評価Oral presentation
- 日本マイクログラビティ応用学会第33回学術講演会 (JASMAC-33), Oct. 2021, Japanese国際宇宙ステーション沸騰・二相流実験向け凝縮器の熱流動特性評価Oral presentation
- 日本マイクログラビティ応用学会第33回学術講演会 (JASMAC-33), Oct. 2021, Japanese国際宇宙ステーション沸騰・二相流実験で得られた透明伝熱管試験部における気泡挙動と壁面温度特性Oral presentation
- 日本マイクログラビティ応用学会第33回学術講演会 (JASMAC-33), Oct. 2021, Japanese国際宇宙ステーション沸騰・二相流実験における金属伝熱管の熱伝達解析Oral presentation
- 日本マイクログラビティ応用学会第33回学術講演会 (JASMAC-33), Oct. 2021, Japanese国際宇宙ステーションにおける沸騰・二相流実験でのヒートロス評価Oral presentation
- 日本マイクログラビティ応用学会 第33回学術講演会 (JASMAC-33), Oct. 2021, Japanese国際宇宙ステーション沸騰・二相流実験での二相流体ループのシステム特性Oral presentation
- 熱工学コンファレンス 2021, Oct. 2021, Japanese国際宇宙ステーション沸騰二相流実験における透明伝熱管内壁面温度の導出及び気泡挙動と壁面温度との関連Oral presentation
- 2021年度日本冷凍空調学会年次大会, Sep. 2021, Japanese核沸騰促進による低流量域における流下液膜蒸発の伝熱劣化抑制Oral presentation
- 2021年度日本冷凍空調学会年次大会, Sep. 2021, Japanese水平三角形細管内凝縮流のボイド率特性Oral presentation
- 混相流シンポジウム2021, Aug. 2021, Japanese国際宇宙ステーションで実施した強制流動沸騰実験における熱損失評価と熱伝達解析Oral presentation
- 混相流シンポジウム2021, Aug. 2021, Japanese三角形および矩形細管内気液二相流のボイド率特性に関する研究Oral presentation
- 混相流シンポジウム2021, Aug. 2021, Japanese水平非円形細管内気液二相流のボイド率特性に関する研究Oral presentation
- 第25回動力・エネルギー技術シンポジウム, Jul. 2021, Japaneseミニチャネル直交型蒸発器における冷媒相分布に関する研究（ボイド率計測結果に基づく偏流評価）Oral presentation
- 日本工学アカデミー関西支部 第6回講演会, Jul. 2021, Japanese工学部グローバルチャレンジプログラムの取り組み[Invited]Invited oral presentation
- 第58回日本伝熱シンポジウム, May 2021, Japanese自励振動ヒートパイプの熱伝達特性に及ぼす設置姿勢の影響Oral presentation
- 関西工学教育協会機械分科会第2回研究会, Mar. 2021, Japaneseコロナ禍における神戸大学グローバルチャレンジプログラムでの取り組み[Invited]Invited oral presentation
- 第98期流体工学部門講演会, Nov. 2020, Japanese国際宇宙ステーションでの沸騰気液二相流実験（一成分系気液二相流の気液界面構造）Oral presentation
- 第98期流体工学部門講演会, Nov. 2020, Japaneseミニチャネル直交型蒸発器内冷媒二相流のボイド率分布計測Oral presentation
- 第98期流体工学部門講演会, Nov. 2020, Japanese水平管群内気液二相流の熱伝達特性に及ぼす気泡流動の影響Oral presentation
- 第98期流体工学部門講演会, Nov. 2020, Japanese固体高分子形燃料電池内の水分布の可視化と電気化学特性に関する研究Oral presentation
- 2020年度日本冷凍空調学会年次大会, Sep. 2020, Japaneseプレートフィン蒸発器における加熱媒体温度分布と冷媒流れの可視化 －加熱媒体流動方向の影響－Oral presentation
- 2020年度日本冷凍空調学会年次大会, Sep. 2020, Japanese三角形細管内HFC245faの凝縮熱流動特性に関する研究Oral presentation
- 2020年度日本冷凍空調学会年次大会, Sep. 2020, Japanese半円断面ミニチャネル内の熱流動特性に関する研究Oral presentation
- 2020年度日本冷凍空調学会年次大会, Sep. 2020, Japanese溶射被膜を有するローフィン管のR134aおよびR1233zd(E)における水平管外流下液膜蒸発熱伝達に関する研究Oral presentation
- 日本技術士会近畿本部兵庫県支部 第24回 CPD講座, Sep. 2020, Japanese宇宙構造物用二相流体冷却システムの開発 －国際宇宙ステーションでの実証実験－[Invited]Invited oral presentation
- 混相流シンポジウム2020, Aug. 2020, Japanese国際宇宙ステーションでの沸騰気液⼆相流実験で観察された気液界面構造：スラグ流の界面挙動Oral presentation
- 混相流シンポジウム2020, Aug. 2020, Japanese正⽅および正三⾓形細管内鉛直上昇気液⼆相流のボイド率特性Oral presentation
- 第6.5回相変化界面研究会, May 2020, Japanese管外流下液膜蒸発に関する研究[Invited]Oral presentation
- 日本機械学会 関西支部第95期定時総会講演会, Mar. 2020, Japanese非ニュートンスラリーの伝熱特性に関する研究
- 日本機械学会 関西支部第95期定時総会講演会, Mar. 2020, Japanese細管内鉛直上昇一成分気液二相流のボイド率特性に及ぼす流路断面形状の影響に関する研究
- 潜熱工学シンポジウム2019, Dec. 2019Hard-shell micro-encapsulation of Na2HPO4 hydrates - Impacts of coating process -
- 化学工学会姫路大会2019, Dec. 2019, Japanese硬殻シリカマイクロカプセルの高内包率化Oral presentation
- 化学工学会姫路大会2019, Dec. 2019, Japanese硬殻マイクロカプセルのU字管内流動特性の調査Oral presentation
- 2019 NASA SLPSRA Fluid Physics Workshop, Oct. 2019, EnglishJAXA's Two-Phase Flow Experiments[Invited]Invited oral presentation
- 日本マイクログラビティ応用学会 第31回学術講演会 (JASMAC-31), Oct. 2019, Japanese透明伝熱管加熱部における微小重力下での気液挙動Oral presentation
- 日本マイクログラビティ応用学会 第31回学術講演会 (JASMAC-31), Oct. 2019, Japanese微小重力場における沸騰気液二相流の気液界面構造Oral presentation
- 14th International Conference on "Two-Phase Systems for Space and Ground Applications", Sep. 2019, EnglishHeat Loss Analysis for Accurate Evaluation of Fluid Conditions at Test Section in Flow Boiling Experiments onboard International Space StationPoster presentation
- 14th International Conference on "Two-Phase Systems for Space and Ground Applications", Sep. 2019, EnglishLiquid film structure of annular flows under microgravity - Results of TPF experiments onboard International Space Station -Keynote oral presentation
- 2019年度日本冷凍空調学会年次大会, Sep. 2019, Japanese溶射被膜による水平管外流下液膜蒸発熱伝達の促進に関する研究Oral presentation
- 2019年度日本冷凍空調学会年次大会, Sep. 2019, Japaneseミニチャネル直交型蒸発器内の冷媒流れの可視化とボイド率計測，穴あきもしくはオフセットリブによる流動分配改善効果Oral presentation
- 2019年度日本冷凍空調学会年次大会, Sep. 2019, Japanese水平管群沸騰熱伝達に及ぼす管配列の影響に関する研究Oral presentation
- 日本混相流学会 混相流シンポジウム2019, Aug. 2019, Japanese国際宇宙ステーションでの沸騰気液二相流実験で観察された気液界面構造：気泡流の気泡挙動Oral presentation
- 日本混相流学会 混相流シンポジウム2019, Aug. 2019, Japanese国際宇宙ステーションでの沸騰気液二相流実験で観察された気液界面構造：環状流の液膜構造Oral presentation
- 日本混相流学会 混相流シンポジウム2019, Aug. 2019, Japanese超音波トモグラフィによる気泡流の瞬時ボイド分布計測法の開発Oral presentation
- 第24回動力・エネルギー技術シンポジウム 2019年6月, Jun. 2019, Japanese水平管群内空気－水二相流の熱流動特性に及ぼすピッチ直径比の影響に関する研究Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conference溶射加工による水平管外流下液膜蒸発熱伝達の促進に関する研究Oral presentation
- 日本機械学会 関西支部第94期定時総会講演会, Mar. 2019, Japanese, 日本機械学会 関西支部, 草津, Domestic conference並列垂直管内沸騰二相流の流動特性に関する研究Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conference微小重力場における気液二相流の気泡挙動に関する研究Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conference反射法を用いた超音波トモグラフィによる気泡流のボイド分布計測Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conference水平管群周り空気 －水気液二相流の熱流動特性に及ぼすピッチ直径比の影響に関する研究Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conference水平管群の沸騰伝熱特性に関する研究Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conference三角形細管内HFC134aの凝縮熱伝達特性に関する研究Oral presentation
- 日本機械学会 関西支部第94期定時総会講演会, Mar. 2019, Japanese, 日本機械学会 関西支部, 草津, Domestic conference吸着材への蒸気吸着の過渡特性に関する実験的研究Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conferenceクランプオン式超音波流量計による蒸気流量計測の検討Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conferencePEFC内部の水輸送現象が発電性能に与える影響の解明Oral presentation
- 日本機械学会 関西学生会平成30年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会 関西学生会, 草津, Domestic conferenceEffect of flow path diameter on heat transfer performance of pulsating heat pipeOral presentation
- 化学工学会中国四国支部・関西支部合同徳島大会, 2018, Dec. 2018, Japanese, 化学工学会, 徳島大学, Domestic conferenceシリカマイクロカプセルの連続合成におけるホモジナイザー撹拌の粒子径への影響Oral presentation
- 第96期流体工学部門講演会, Nov. 2018, Japanese, 日本機械学会流体工学部門, 室蘭, Domestic conference反射法を用いた超音波トモグラフィによる気液二相流のボイド分布計測法の開発Poster presentation
- 第96期流体工学部門講演会, Nov. 2018, Japanese, 日本機械学会流体工学部門, 室蘭, Domestic conferenceクランプオン式超音波流量計による蒸気流量計測の検討Poster presentation
- 日本マイクログラビティ応用学会第30回学術講演会, Oct. 2018, Japanese, 日本マイクログラビティ応用学会, 岐阜, Domestic conference透明伝熱管試験部での国際宇宙ステーション沸騰・二相流実験結果報告Oral presentation
- 13th International Conference on Two-phase Systems for Space and Ground Applications, Oct. 2018, English, Xi'an, China, International conferenceTwo-Phase Flow Behaviors Observed in TPF Experiment onboard International Space StationOral presentation
- 日本マイクログラビティ応用学会第30回学術講演会, Oct. 2018, Japanese, 日本マイクログラビティ応用学会, 岐阜, Domestic conferenceISS実験TPFの経過とデータ解析Oral presentation
- The 29th International Symposium on Transport Phenomena (ISTP29), Oct. 2018, English, Honolulu, Hawaii, USA, International conferenceFabrication of Hard-Shell Microcapsules Containing Sodium Acetate Inorganix HydratesOral presentation
- 13th International Conference on Two-phase Systems for Space and Ground Applications, Oct. 2018, English, Xi'an, China, Domestic conferenceCondensing heat transfer in a quadrilobed tubeKeynote oral presentation
- 2018年度日本冷凍空調学会年次大会, Sep. 2018, Japanese, 日本冷凍空調学会, 郡山, Domestic conference水平狭隘流路内サブクール沸騰熱伝達における溶射被膜の効果に関す研究Oral presentation
- 2018年度日本冷凍空調学会年次大会, Sep. 2018, Japanese, 日本冷凍空調学会, 郡山, Domestic conference水平管群内沸騰熱伝達に関する研究Oral presentation
- 2018年度日本冷凍空調学会年次大会, Sep. 2018, Japanese, 日本冷凍空調学会, 郡山, Domestic conference減圧を伴う冷媒-油二相流の細管内流動特性に関する研究-－-第１報 溶解冷媒を含む油単相流入条件での実験評価-Oral presentation
- 2018年度日本冷凍空調学会年次大会, Sep. 2018, Japanese, 日本冷凍空調学会, 郡山, Domestic conferenceミニチャンネル直交型蒸発器内の冷媒流れの可視化とボイド率計測Oral presentation
- 日本機械学会2018年度年次大会, Sep. 2018, Japanese, 日本機械学会, 大阪, Domestic conferenceコージェネレーションシステムについてPublic discourse
- 11th World Conference on Neutron Radiography, Sep. 2018, English, International Society for Neutron Radiography, Sydney, Australia, International conferenceVisualization and measurement of boiling flow behaviors in parallel mini-channel heat exchanger by neutron radiographyPoster presentation
- 11th World Conference on Neutron Radiography, Sep. 2018, English, International Society for Neutron Radiography, Sydney, Australia, International conferenceSimultaneous measurements of water distribution and electrochemical characteristics in polymer electrolyte fuel cellPoster presentation
- 混相流シンポジウム2018, Aug. 2018, Japanese, 日本混相流学会, 仙台, Domestic conference微小重力場における円管内気泡挙動に関する研究Oral presentation
- 混相流シンポジウム2018, Aug. 2018, Japanese, 日本混相流学会, 仙台, Domestic conference自励振動型ヒートパイプの設置姿勢による熱輸送特性への影響Oral presentation
- 混相流シンポジウム2018, Aug. 2018, Japanese, 日本混相流学会, 仙台, Domestic conference広角超音波センサを用いた気液二相流のボイド分布計測法の検討Oral presentation
- The 16th International Heat Transfer Conference (IHTC-16), Aug. 2018, English, Beijing, China, International conferenceEffects of Fabrication Conditions on Silica Hard-Shell Microcapsules Containing Phase Change MaterialsPoster presentation
- 第23回動力・エネルギー技術シンポジウム, Jun. 2018, Japanese, 日本機械学会動力・エネルギー部門, 宇部, Domestic conference水平管群の沸騰熱流動に関する研究Oral presentation
- 第23回動力・エネルギー技術シンポジウム, Jun. 2018, Japanese, 日本機械学会動力・エネルギー部門, 宇部, Domestic conferenceクランプオン式超音波流量計による湿り蒸気流量計測の検討Oral presentation
- 第23回動力・エネルギー技術シンポジウム, Jun. 2018, Japanese, 日本機械学会動力・エネルギー部門, 宇部, Domestic conferenceT 字合流部に生じる熱疲労発生メカニズムの検討Oral presentation
- 第55回日本伝熱シンポジウム, May 2018, Japanese, 日本伝熱学会, 札幌, Domestic conference酢酸ナトリウム３水和物を内包した硬殻マイクロカプセルの生成Poster presentation
- 第55回日本伝熱シンポジウム, May 2018, Japanese, 日本伝熱学会, 札幌, Domestic conference固体高分子形燃料電池内の膜厚方向水分布と電気特性の同時計測Oral presentation
- 12th IIR/IIF International Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, May 2018, English, Orford, Canada, International conferenceDispersion and Flow Characteristics of Hard-Shell Microcapsules with Phase Change MaterialsOral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conference低沸点冷媒の膜沸騰遷移条件に関する研究Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conference水平管群を横切る気液二相流の管周りボイド率と伝熱特性に関する研究Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conference水平管群の沸騰熱流動に関する研究Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conference自励振動ヒートパイプの設置姿勢による熱輸送特性への影響に関する研究Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conference固体高分子形燃料電池発電時の水分量と電気特性の評価Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conference宇宙ステーションにおける沸騰二相流実験（断熱部での気液界面構造）Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conferenceミニチャネル直交型蒸発器内の冷媒流れの可視化Oral presentation
- 化学工学会学生発表会(東広島大会), Mar. 2018, Japanese, 広島大学, Domestic conferenceマイクロシリカカプセル合成に撹拌条件が与える影響Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conferenceクランプオン式超音波流量計による蒸気流量計測に関する研究Oral presentation
- 関西学生会2017年度学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会関西支部, 寝屋川, Domestic conferenceT字配管合流部における噴流の揺動現象に関する研究Oral presentation
- 第7回潜熱工学シンポジウム, Dec. 2017, Japanese, 日本潜熱工学研究会, 岡山, Domestic conference硬殻マイクロカプセルの流動特性Oral presentation
- 可視化情報全国講演会 (室蘭2017), Nov. 2017, Japanese, 可視化情報学会, 室蘭, Domestic conference超音波を用いた気液二相流におけるボイド率分布計測法の検討Oral presentation
- 可視化情報全国講演会 (室蘭2017), Nov. 2017, Japanese, 可視化情報学会, 室蘭, Domestic conference超音波を用いたT字合流部における噴流の可視化Oral presentation
- 平成29年度非破壊検査・可視化・分析技術研究会, Nov. 2017, Japanese, 中性子産業利用推進協議会, 東京, Domestic conference中性子ラジオグラフィによるエネルギー機器の診断[Invited]Invited oral presentation
- 第4回複雑熱流体工学シンポジア, Nov. 2017, Japanese, 神戸大学, 神戸, Domestic conference細管および異形管内気液二相流のボイド率特性Oral presentation
- 10th World Congress of Chemical Engineering (WCCE10), Oct. 2017, English, Barcelona, Spain, International conferenceHard-Shell Micro-Capsules Containing Disodium Hydrogen Phosphate HydratesPoster presentation
- 2017年度 日本冷凍空調学会 年次大会, Sep. 2017, Japanese, 日本冷凍空調学会, 町田, Domestic conference低熱伝導水平円管周りのプール沸騰熱伝達特性－温水加熱での加熱履歴の影響と溶射被膜による伝熱促進－Oral presentation
- 2017年度 日本冷凍空調学会 年次大会, Sep. 2017, Japanese, 日本冷凍空調学会, 町田, Domestic conference単流路プレートフィン熱交換器内垂直上昇沸騰熱伝達に関する研究－フィンピッチの影響－Oral presentation
- 化学工学会第49回秋季大会, Sep. 2017, Japanese, 化学工学会, 名古屋, Domestic conference硬殻マイクロシリカカプセルの生成特性Oral presentation
- 第28回東海伝熱セミナー, Sep. 2017, Japanese, 日本伝熱学会東海支部, 蒲郡, Domestic conference管内気液二相流の支配力について[Invited]Invited oral presentation
- 混相流シンポジウム2017, Aug. 2017, Japanese, 日本混相流学会, 調布, Domestic conference超音波による液体金属気液二相流の気液速度分布計測手法の開発Oral presentation
- 混相流シンポジウム2017, Aug. 2017, Japanese, 日本混相流学会, 調布, Domestic conference自励振動型ヒートパイプの熱輸送特性に及ぼす流路形状の影響Oral presentation
- 混相流シンポジウム2017, Aug. 2017, Japanese, 日本混相流学会, 調布, Domestic conference鉛直細管内一成分系気液二相流のボイド率特性に及ぼす流路断面形状の影響Oral presentation
- 第45回可視化情報シンポジウム, Jul. 2017, Japanese, 可視化情報学会, 東京, Domestic conference速度拡張法を用いた超音波パルスドップラ法の不確かさ低減手法の検討Oral presentation
- The 2nd Int. Conf. of Interfacial Phenomena and Heat Transfer, Jul. 2017, English, Xi'an, International conferenceEffect of Diameter and Cross-Sectional Shape of Tube on Void Fraction Characteristics of Gas-Liquid Vertically Upward Two-Phase Flows[Invited]Invited oral presentation
- 第22回動力・エネルギー技術シンポジウム, Jun. 2017, Japanese, 日本機械学会, 豊橋, Domestic conferenceプラント配管のT字合流部の流動特性に関する研究Oral presentation
- 第22回動力・エネルギー技術シンポジウム, Jun. 2017, Japanese, 日本機械学会, 豊橋, Domestic conferenceガス拡散層の相対透過率による固体高分子形燃料電池内水輸送への影響Oral presentation
- 第54回日本伝熱シンポジウム, May 2017, Japanese, 日本伝熱学会, 大宮, Domestic conference水平狭隘流路内サブクール沸騰流のボイド率特性Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference溶射皮膜を有する水平円管における等温壁加熱でのプール沸騰熱伝達特性に関する研究Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference熱交換器型デシカント素子の吸着特性に関する研究Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference超音波によるボイド率分布計測法の検討Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference垂直配置プレートフィン蒸発器における加熱媒体流動方向の影響評価に関する研究Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference四葉伝熱管内HFC134aの凝縮熱伝達特性に関する研究Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference高温伝熱管のサブクール水によるリウェット現象に関する研究Oral presentation
- 日本機械学会関西支部第92期定時総会講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference高温金属管での急冷過程におけるリウェット速度に関する研究Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference固体高分子形燃料電池の流路液滴による膜厚方向物質輸送への影響Oral presentation
- 日本機械学会関西学生会平成28年度学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 吹田, Domestic conference一成分系垂直上昇気液二相流のボイド率特性に及ぼす流路断面形状の影響に関する研究Oral presentation
- Int. Symposium on New Refrigerants and Environmental Technology, Dec. 2016, English, The Japan Refrigeration and Air Conditioning Industry Association, Kobe, International conferenceEffect of Refrigerant Oil on Critical Flow Rate Characteristics of CO2 through an OrificePoster presentation
- 第94期日本機械学会流体工学部門講演会, Nov. 2016, Japanese, 日本機械学会, 宇部, Domestic conference水平バンドル内気液二相流の正方および千鳥配列違いによる流動への影響Oral presentation
- 2016年度日本冷凍空調学会年次大会, Sep. 2016, Japanese, 日本冷凍空調学会, 神戸, Domestic conference漏洩検知部を有するヒートポンプ給湯用四葉伝熱管内凝縮熱伝達特性Oral presentation
- 2016年度日本冷凍空調学会年次大会, Sep. 2016, Japanese, 日本冷凍空調学会, 神戸, Domestic conference有機系吸着材を塗布したデシカント素子の吸着特性Oral presentation
- 2016年度日本冷凍空調学会年次大会, Sep. 2016, Japanese, 日本冷凍空調学会, 神戸, Domestic conference正方形細管内一成分系垂直上昇気液二相流のボイド率特性Oral presentation
- 2016年度日本冷凍空調学会年次大会, Sep. 2016, Japanese, 日本冷凍空調学会, 神戸, Domestic conference水平管群内気液二相流管周りの熱流動特性に関する研究Oral presentation
- 2016年度日本冷凍空調学会年次大会, Sep. 2016, Japanese, 日本冷凍空調学会, 神戸, Domestic conference四葉管熱交換器の水側伝熱促進Oral presentation
- 2016年度日本冷凍空調学会年次大会, Sep. 2016, Japanese, 日本冷凍空調学会, 神戸, Domestic conferenceオリフィスを通過するCO2 臨界流の流動特性に及ぼすオイル混入の影響Oral presentation
- 11th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2016, English, Marseille, International conferenceVoid Fraction Characteristics of One-Component Vertical Upward Two-Phase Flows in Small Diameter TubePoster presentation
- 11th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2016, English, Marseille, International conferenceEffect of Dissolved Air on Flow Boiling Heat TransferOral presentation
- 11th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2016, English, Marseille, International conferenceDevelopment of Flow Structure of Vertical Upward Two-Phase Flows from the Exit of Heating SectionPoster presentation
- 日本混相流学会混相流シンポジウム2016, Aug. 2016, Japanese, 日本混相流学会, 京都, Domestic conference自励振動型ヒートパイプの内部流動と熱輸送特性に関する研究Oral presentation
- 日本混相流学会混相流シンポジウム2016, Aug. 2016, Japanese, 日本混相流学会, 京都, Domestic conference一成分二相流の流動特性に及ぼす管内径の影響Oral presentation
- 日本混相流学会混相流シンポジウム2016, Aug. 2016, Japanese, 日本混相流学会, 京都, Domestic conference一成分二相流の流れの発達に関する研究Oral presentation
- 第21回動力・エネルギー技術シンポジウム, Jun. 2016, Japanese, 日本機械学会, 横浜, Domestic conference伝播時間差式超音波流量計の精度に及ぼす速度分布の影響Oral presentation
- 第21回動力・エネルギー技術シンポジウム, Jun. 2016, Japanese, 日本機械学会, 横浜, Domestic conference水平四葉伝熱管内凝縮熱伝達に関する研究Oral presentation
- 第53回日本伝熱シンポジウム, Jun. 2016, Japanese, 日本伝熱学会, 大阪, Domestic conference自励振動型ヒートパイプの流路形状による熱輸送特性への影響Oral presentation
- 第53回日本伝熱シンポジウム, Jun. 2016, Japanese, 日本伝熱学会, 大阪, Domestic conference固体高分子形燃料電池における膜厚方向の水分布に関する研究Oral presentation
- 第21回動力・エネルギー技術シンポジウム, Jun. 2016, Japanese, 日本機械学会, 横浜, Domestic conference強制流動沸騰における熱伝達特性に及ぼす溶存空気の影響Oral presentation
- 第53回日本伝熱シンポジウム, Jun. 2016, Japanese, 日本伝熱学会, 大阪, Domestic conference強制対流沸騰熱伝達に及ぼす人工キャビティの影響に関する研究Oral presentation
- 第21回動力・エネルギー技術シンポジウム, Jun. 2016, Japanese, 日本機械学会, 横浜, Domestic conferenceデシカント素子の吸着過程での温度変化の可視化計測Oral presentation
- 日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪, Domestic conference膨張弁を模擬したオリフィスを通過するCO2冷媒の流量特性Oral presentation
- 日本機械学会関西支部 第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪, Domestic conference地熱発電所用復水器における水噴霧特性に関する研究Poster presentation
- 日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪, Domestic conference固体高分子形燃料電池内の水輸送現象に関する研究Oral presentation
- 日本機械学会関東支部第22期総会・講演会, Mar. 2016, Japanese, 日本機械学会関東支部, 東京, Domestic conference強制流動沸騰熱伝達に及ぼす溶存空気の影響Oral presentation
- 日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪, Domestic conference一成分気液二相流の流れの発達に関する研究Oral presentation
- 日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceプレートフィン熱交換器内沸騰熱伝達に及ぼす加熱媒体流動方向の影響に関する研究Oral presentation
- 日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceヒートポンプ給湯用４葉伝熱管内凝縮熱伝達特性Oral presentation
- International Symposium and School of Young Scientists, Interfacial Phenomena and Heat Transfer, Mar. 2016, English, Novosibirsk, Russia, International conferenceEffect of Tube Diameter on Void Fraction Characteristics of One-Component Vertically Upward Two-Phase Flows[Invited]Invited oral presentation
- International Symposium and School of Young Scientists, Interfacial Phenomena and Heat Transfer, Mar. 2016, English, Novosibirsk, Russia, International conferenceEffect of Surface Structure on DNB of Subcooled flow Boiling in a Narrow ChannelPoster presentation
- 第93期日本機械学会流体工学部門講演会, Nov. 2015, Japanese, 日本機械学会, 東京, Domestic conference超音波パルスドップラ法の計測速度限界拡張による測定精度への影響評価Oral presentation
- 熱工学コンファレンス2015, Oct. 2015, Japanese, 日本機械学会, 大阪, Domestic conference自励振動型ヒートパイプの熱輸送特性に関する研究Oral presentation
- 熱工学コンファレンス2015, Oct. 2015, Japanese, 日本機械学会, 大阪, Domestic conference強制流動沸騰の熱伝達及び気泡挙動に及ぼす溶存気体の影響Oral presentation
- 2015年度日本冷凍空調学会年次大会, Oct. 2015, Japanese, 日本冷凍空調学会, 東京, Domestic conference一成分気液二相流のボイド率に及ぼす管径の影響に関する研究Oral presentation
- 2015年度日本冷凍空調学会年次大会, Oct. 2015, Japanese, 日本冷凍空調学会, 東京, Domestic conferenceヒートポンプ給湯用四葉伝熱管内凝縮熱伝達特性Oral presentation
- 2015年度日本冷凍空調学会年次大会, Oct. 2015, Japanese, 日本冷凍空調学会, 東京, Domestic conferenceオリフィスを通過する入口サブクールとしたCO2 冷媒の流量特性Oral presentation
- 7th European-Japanese Two-Phase Flow Group Meeting, Oct. 2015, English, Zermatt, Switzerland, International conferenceWall Temperature and Void Fraction Characteristics in Boiling TransitionOral presentation
- 7th European-Japanese Two-Phase Flow Group Meeting, Oct. 2015, English, Zermatt, Switzerland, International conferenceStudy on Water Transport Phenomena in Polymer Electrolyte Membrane Fuel Cell in the Through-Plane DirectionOral presentation
- 10th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2015, English, Kyoto, International conferenceVoid Fraction Characteristics of One-Component Gas-Liquid Two-Phase Flow in Small Diameter TubePoster presentation
- 10th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2015, English, Kyoto, International conferenceEffect of Surface Structure on DNB of Subcooled Flow Boiling in a Narrow ChannelPoster presentation
- 10th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2015, English, Kyoto, International conferenceCurrent Status of Two-Phase Flow Visualization and Measurement Section for Boiling and Two-Phase Experiments onboard ISS/KiboPoster presentation
- 10th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2015, English, Kyoto, International conferenceCurrent Status of Transparent Heated Tube Section for Japanese ISS ExperimentPoster presentation
- 日本混相流学会混相流シンポジウム2015, Aug. 2015, Japanese, 日本混相流学会, 高知, Domestic conference狭隘流路内サブクール沸騰流の熱伝達特性 －溶射被膜による伝熱促進とボイド率特性－Oral presentation
- 日本混相流学会混相流シンポジウム2015, Aug. 2015, Japanese, 日本混相流学会, 高知, Domestic conference強制対流沸騰におけるDNB発生機構の実験的研究Oral presentation
- 日本混相流学会混相流シンポジウム2015, Aug. 2015, Japanese, 日本混相流学会, 高知, Domestic conference一成分気液二相流のボイド率に及ぼす重力の影響に関する研究Oral presentation
- 第52回日本伝熱シンポジウム, Jun. 2015, Japanese, 日本伝熱学会, 福岡, Domestic conference固体高分子形燃料電池における膜厚方向の水輸送現象Oral presentation
- 第52回日本伝熱シンポジウム, Jun. 2015, Japanese, 日本伝熱学会, 福岡, Domestic conference狭隘流路内サブクール沸騰流のDNBでのボイド率変動と伝熱面構造の影響Oral presentation
- 第20回動力・エネルギー技術シンポジウム, Jun. 2015, Japanese, 日本機械学会, 仙台, Domestic conference活性炭吸着層内エタノール吸着量分布の可視化・計測Oral presentation
- International Workshop on Phase Change and Wetting Phenomena, Jun. 2015, English, Fukuoka, International conferencePressure and Void Fraction Fluctuations during DNB in Subcooled Flow BoilingKeynote oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都, Domestic conference自励振動ヒートパイプの流動特性に関する研究Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都, Domestic conference固体高分子型燃料電池内における水輸送に関する研究Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都, Domestic conference狭隘流路内サブクール沸騰流のDNB 現象に及ぼす表面構造の影響Oral presentation
- 日本機械学会関西支部第90期定時総会講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都, Domestic conference強制流動沸騰熱伝達に及ぼす人工キャビティの影響Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都, Domestic conferenceヒートポンプ給湯用伝熱管内凝縮熱伝達特性Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都, Domestic conferenceオリフィスを通過するCO2 冷媒の臨界流量特性Oral presentation
- 第29回宇宙環境利用シンポジウム, Jan. 2015, Japanese, 宇宙航空研究開発機構（JAXA）, 相模原, Domestic conference非共溶性混合媒体の強制流動沸騰を用いた宇宙用排熱処理システムの極限性能の追及Oral presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conference沸騰・二相流体ループの加熱円管壁面における気液挙動と熱伝達Oral presentation
- 第55回電池討論会, Nov. 2014, Japanese, 京都, Domestic conference中性子ラジオグラフィを用いたMPLによるPEFC内水輸送現象への影響評価Oral presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conference一成分二相流のボイド率特性に及ぼす管径の影響Oral presentation
- The International Symposium on New Refrigerants and Environmental Technology 2014, Nov. 2014, English, 神戸, International conferencePerformance Characteristics of Plate-Type Condenser for Heat Pump Water HeaterPoster presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conferenceISS 利用TPF 沸騰二相流実験 その４．観察部での気液界面構造の計測Oral presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conferenceISS 利用TPF 沸騰二相流実験 その5．凝縮器の開発Oral presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conferenceISS利用 TPF沸騰二相流実験 その3. 蒸発部の開発Oral presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conferenceISS利用 TPF沸騰二相流実験 その2．実験装置の開発Oral presentation
- 日本マイクログラビティ応用学会第28回学術講演会, Nov. 2014, Japanese, 日本マイクログラビティ応用学会, 姫路, Domestic conferenceISS利用 TPF沸騰二相流実験 その1．概要Oral presentation
- 10th World Conference on Neutron Radiography, Oct. 2014, English, Grindelwald, Switzerland, International conferenceVisualization of Water Accumulation Process in Polymer Electrolyte Fuel Cell using Neutron RadiographyPoster presentation
- 10th World Conference on Neutron Radiography, Oct. 2014, English, Grindelwald, Switzerland, International conferenceVisualization and Measurement of Adsorption/Desorption Process of Ethanol in Activated Carbon AdsorberPoster presentation
- 2014年度日本冷凍空調学会年次大会, Sep. 2014, Japanese, 日本冷凍空調学会, 佐賀, Domestic conference高温用ヒートポンプシステムの開発Oral presentation
- 2014年度日本冷凍空調学会年次大会, Sep. 2014, Japanese, 日本冷凍空調学会, 佐賀, Domestic conferenceヒートポンプ給湯用プレート式凝縮器の伝熱特性Oral presentation
- 2014年度日本冷凍空調学会年次大会, Sep. 2014, Japanese, 日本冷凍空調学会, 佐賀, Domestic conferenceエタノール・活性炭系吸着器の吸脱着過程の可視化・計測Oral presentation
- The 9th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2014, English, Baltimore, MD, USA, International conferenceVoid Fraction Characteristics and Flow Patterns of One-Component Gas-Liquid Two-Phase FlowOral presentation
- The 9th International Conference on Two-Phase Systems for Ground and Space Applications, Sep. 2014, English, Baltimore, MD, USA, International conferenceIntroduction and Status of hardware and development for Boiling and Two-Phase Experiments onboard ISS/KiboPoster presentation
- 混相流シンポジウム2014, Jul. 2014, Japanese, 日本混相流学会, 札幌, Domestic conference溶射皮膜を有する狭隘流路内沸騰二相流の液ホールドアップ特性Oral presentation
- 混相流シンポジウム2014, Jul. 2014, Japanese, 日本混相流学会, 札幌, Domestic conference固体高分子形燃料電池における流路内に滞留する液滴形状と圧力損失Oral presentation
- 混相流シンポジウム2014, Jul. 2014, Japanese, 日本混相流学会, 札幌, Domestic conference加熱部が短い円管での沸騰熱伝達と気液挙動についてOral presentation
- 混相流シンポジウム2014, Jul. 2014, Japanese, 日本混相流学会, 札幌, Domestic conference一成分二相流のボイド率特性に及ぼす管径の影響Oral presentation
- 第19回動力・エネルギー技術シンポジウム, Jun. 2014, Japanese, 日本機械学会, 福井, Domestic conference固体高分子形燃料電池における流路内の液滴形状と圧力損失評価Oral presentation
- 第19回動力・エネルギー技術シンポジウム, Jun. 2014, Japanese, 日本機械学会, 福井, Domestic conferenceヒートポンプ給湯用プレート式凝縮器の熱交換特性Oral presentation
- 第51回日本伝熱シンポジウム, May 2014, Japanese, 日本伝熱学会, 浜松, Domestic conference固体高分子形燃料電池における電池内膜厚方向水分布の可視化と計測Oral presentation
- 7th Asian Conference on Refrigeration and Air Conditioning, May 2014, English, Jeju Island,Korea, International conferenceVisualization and Measurement of Refrigerant Flow by Neutron Radiography[Invited]Invited oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 堺, Domestic conference固体子分子形燃料電池における流路内液滴挙動と圧力損失評価Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 堺, Domestic conference固体高分子形燃料電池における膜厚方向水輸送現象に関する研究Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 堺, Domestic conferenceエタノール・活性炭系吸着器の吸脱着過程の可視化・計測Oral presentation
- 日本マイクログラビティ応用学会第27回学術講演会, Nov. 2013, Japanese, 日本マイクログラビティ応用学会, 東京, Domestic conference細管内一成分系気液二相流のボイド率特性Oral presentation
- 日本マイクログラビティ応用学会第27回学術講演会, Nov. 2013, Japanese, 日本マイクログラビティ応用学会, 東京, Domestic conference「きぼう」における沸騰二相流実験装置の開発状況Oral presentation
- 第54回電池討論会, Oct. 2013, Japanese, 大阪, Domestic conference固体高分子形燃料電池内におけるGDL内膜厚方向水輸送現象に関する研究Oral presentation
- 熱工学コンファレンス2013, Oct. 2013, Japanese, 日本機械学会, Domestic conferenceヒートポンプ給湯器用プレート式凝縮器の熱交換性能Oral presentation
- International Conference on Power Engineering (ICOPE-2013), Oct. 2013, English, Wuhan, China, International conferenceIntroduction of the Activity of the Research Committee for the Urgent Surveys of the East Japan Great-Earthquake and Proposals of Future Measures of the JSME -Influence on thermal power stations and energy systemsKeynote oral presentation
- 日本冷凍空調学会年次大会, Sep. 2013, Japanese, 日本冷凍空調学会, 東京, Domestic conference単流路プレートフィン蒸発器内の熱流動特性に関する研究Oral presentation
- 日本冷凍空調学会年次大会, Sep. 2013, Japanese, 日本冷凍空調学会, 東京, Domestic conferenceキャピラリーチューブ内CO2冷媒の減圧沸騰流に関する研究Oral presentation
- Eighth International Symposium on Two-Phase Systems for Ground and Space Applications, Sep. 2013, English, Bremen, Germany, International conferenceReduction of Wall Superheat Overshoot in Rapid Heating by a Pulsed Decompression using a Blind TubeOral presentation
- Eighth International Symposium on Two-Phase Systems for Ground and Space Applications, Sep. 2013, English, Bremen, Germany, International conferencePreliminary Tests on Heat Transfer Data Measurement for Flow Boiling Experiment onboard ISSOral presentation
- Eighth International Symposium on Two-Phase Systems for Ground and Space Applications, Sep. 2013, English, Bremen, Germany, International conferenceLiquid Hold-up Characteristics of Saturated Boiling flow in a Narrow Channel with Thermal Spray CoatingOral presentation
- Eighth International Symposium on Two-Phase Systems for Ground and Space Applications, Sep. 2013, English, Bremen, Germany, International conferenceDissolved Gas Effects on Flow Boiling Heat Transfer in Safety Verification Test for Boiling Two-Phase Flow Experiment onboard the ISSOral presentation
- Eighth International Symposium on Two-Phase Systems for Ground and Space Applications, Sep. 2013, English, Bremen, Germany, International conferenceA Short Transparent Heated Tube for Understanding Local Heat Transfer MechanismOral presentation
- 混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference二相流体ループISS実験装置のシステム特性Oral presentation
- 混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference静電容量法による細管内一成分気液二相流のボイド率計測Oral presentation
- 混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference固体高分子形燃料電池の流路内水形状の検討とガス流動解析Oral presentation
- 混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference局所熱伝達計測の為の透明伝熱短縮管の開発Oral presentation
- 混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference軌道上沸騰二相流実験に向けた安全検証試験結果Oral presentation
- 混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference宇宙ステーション実験用透明伝熱管試験部における画像解析法の検討Oral presentation
- 第18回動力・エネルギー技術シンポジウム, Jun. 2013, Japanese, 日本機械学会, 千葉, Domestic conference固体高分子形燃料電池の流路内液滴形状の検討とガス流動解析Oral presentation
- 第18回動力・エネルギー技術シンポジウム, Jun. 2013, Japanese, 日本機械学会, 千葉, Domestic conferenceヒートポンプ給湯器用プレート式凝縮器の性能評価Oral presentation
- 第50回日本伝熱シンポジウム, May 2013, Japanese, 日本伝熱学会, 仙台, Domestic conference固体高分子形燃料電池内におけるMPLによる水輸送現象への影響Oral presentation
- 第50回日本伝熱シンポジウム, May 2013, Japanese, 日本伝熱学会, 仙台, Domestic conference圧力操作による急加熱時沸騰開始壁面過熱度の低減に関する研究Oral presentation
- 第47回空気調和・冷凍連合講演会, Apr. 2013, Japanese, 日本機械学会，日本冷凍空調学会，空気調和・衛生工学会, 東京, Domestic conference高温冷媒ヒートポンプOral presentation
- 日本機械学会関西学生会 学生員卒業研究発表会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference溶射被膜を施した狭隘流路内における沸騰形態とその変化Oral presentation
- 日本機械学会関西学生会 学生員卒業研究発表会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference単流路プレートフィン蒸発器内の熱流動特性に関する研究Oral presentation
- 日本機械学会関西学生会 学生員卒業研究発表会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference固体高分子形燃料電池内におけるMPLの有無による膜厚方向水輸送現象への影響評価Oral presentation
- 日本機械学会関西学生会 学生員卒業研究発表会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference固体高分子形燃料電池の流路内水形状を考慮したガス流動解析の高度化Oral presentation
- 日本機械学会関西学生会 学生員卒業研究発表会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conferenceヒートポンプ給湯用プレート式凝縮器の性能評価Oral presentation
- 第53回電池討論会, Nov. 2012, Japanese, 電気化学会, 福岡市, Domestic conference中性子ラジオグラフィを用いたPEFC発電時の膜厚方向水輸送現象の可視化Oral presentation
- 第26回学術講演会(JASMAC-26), Nov. 2012, Japanese, マイクログラビティ応用学会, 福岡市, Domestic conference地上および微小重力場にける強制対流沸騰熱伝達と気液挙動 －ISS実験に向けて－Poster presentation
- 日本マイクログラビティ応用学会第26回学術講演会, Nov. 2012, Japanese, 日本マイクログラビティ応用学会, 福岡, Domestic conference地上および微小重力場における強制対流沸騰熱伝達と気液挙動 -ISS実験に向けて-Oral presentation
- 第49回日本航空宇宙学会 関西・中部支部合同秋期大会, Nov. 2012, Japanese, 日本航空宇宙学会, 名古屋市, Domestic conference国際宇宙ステーション「きぼう」での沸騰二相流体ループ実験の紹介Oral presentation
- 第26回学術講演会(JASMAC-26), Nov. 2012, Japanese, マイクログラビティ応用学会, 福岡市, Domestic conference宇宙実験における熱電対温度測定システムの小型化 と高精度化Poster presentation
- 第49回日本航空宇宙学会 関西・中部支部合同秋期大会, Nov. 2012, Japanese, 日本航空宇宙学会, 名古屋市, Domestic conference圧力操作による急加熱時の沸騰開始過熱度の低減Oral presentation
- 日本マイクログラビティ応用学会第26回学術講演会, Nov. 2012, Japanese, 日本マイクログラビティ応用学会, 福岡, Domestic conference「きぼう」での強制流動沸騰実験に用いる実験装置の開発Oral presentation
- 第26回学術講演会(JASMAC-26), Nov. 2012, Japanese, マイクログラビティ応用学会, 福岡市, Domestic conference「きぼう」での強制流動沸騰実験に用いる実験装置の開発Poster presentation
- 熱工学コンファレンス2012, Nov. 2012, Japanese, 日本機械学会, 熊本市, Domestic conferenceCO2冷媒のキャピラリーチューブ内減圧沸騰流に関する研究Oral presentation
- 日本冷凍空調学会年次大会, Sep. 2012, Japanese, 日本冷凍空調学会, 札幌市, Domestic conference単流路プレートフィン蒸発器の熱交換性能に及ぼす冷媒流動の影響に関する研究Oral presentation
- 市民フォーラム「東日本大震災を契機として我が国のエネルギーインフラの諸問題を考える」, Sep. 2012, Japanese, 日本機械学会, 東京都, Domestic conference火力発電とエネルギープラントにおける震災被害とその影響[Invited]Nominated symposium
- 日本冷凍空調学会年次大会, Sep. 2012, Japanese, 日本冷凍空調学会, 札幌市, Domestic conference「将来冷媒の先進熱交換技術に関する調査研究」プロジェクト活動報告[Invited]Nominated symposium
- Seventh International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2012, English, Beijing, China, International conferenceReduction of Wall Superheat Overshoot in a Rapid Heating by a Thermal Spray CoatingOral presentation
- Seventh International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2012, English, Beijing, China, International conferencePreliminary Tests on Two-Phase Flow Visualization and Measurement for Two-Phase Flow Loop Experiment in International Space StationOral presentation
- Seventh International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2012, English, Beijing, China, International conferenceDynamic Characteristics and Its Control of Two-Phase flow Loop SystemKeynote oral presentation
- Seventh International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2012, English, Beijing, China, International conferenceCurrent status of development of the Transparent Heated Tube Test-section for Boiling and Two-phase Flow Experiment onboard "KIBO"Poster presentation
- 日本冷凍空調学会年次大会, Sep. 2012, English, 日本冷凍空調学会, 札幌市, Domestic conferenceCparison between Homogenous, Separated and Drift Flux Two-Phase Flow Models for Adiabatic Capillary Tube Flow in a Transcritical CO2 Heat PumpOral presentation
- 日本混相流学会年会講演会2012, Aug. 2012, Japanese, 日本混相流学会, 柏市, Domestic conference微小重力場におけるポンプ駆動二相流体ループの熱流動特性(透明伝熱管内沸騰熱伝達特性)Oral presentation
- 日本混相流学会年会講演会2012, Aug. 2012, Japanese, 日本混相流学会, 柏市, Domestic conference二相流体ループのISS実験における二相流計測の予備検討Oral presentation
- 日本混相流学会年会講演会2012, Aug. 2012, Japanese, 日本混相流学会, 柏市, Domestic conference国際宇宙ステーション微小重力環境下での沸騰二相流実験に向けた透明伝熱管試験部の開発Oral presentation
- 日本混相流学会年会講演会2012, Aug. 2012, Japanese, 日本混相流学会, 柏市, Domestic conference圧力操作による急加熱時の沸騰開始壁面過熱度の低減効果(平滑面および沸騰伝熱促進面での実験)Oral presentation
- 日本機械学会 第17回動力・エネルギー技術シンポジウム, Jun. 2012, Japanese, 日本機械学会, 福岡市, Domestic conference中性子ラジオグラフィを用いたPEFC内における面方向水分布計測と流路‐GDLにおけるガス流動解析Oral presentation
- 日本伝熱学会 第49回日本伝熱シンポジウム, May 2012, Japanese, 日本伝熱学会, 富山市, Domestic conference中性子ラジオグラフィを用いた固体高分子形燃料電池におけるGDL・流路内の滞留水挙動の可視化Oral presentation
- 日本伝熱学会 第49回日本伝熱シンポジウム, May 2012, Japanese, 日本伝熱学会, 富山市, Domestic conference中性子ラジオグラフィによる可変コンダクタンスヒートパイプ（VCHP）の可視化Oral presentation
- 日本伝熱学会 第49回日本伝熱シンポジウム, May 2012, Japanese, 日本伝熱学会, 富山市, Domestic conference多孔質伝熱面を有する狭隘流路内限界熱流束Oral presentation
- 日本機械学会 関西学生会学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conferencePreliminary Tests on Two-Phase Flow Visualization and Measurement for Two-Phase Flow Loop Experiment in International Space StationOral presentation
- 日本機械学会 関西学生会学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conferenceMeasurement of Water Distribution in a Small PEFC by Neutron RadiographyOral presentation
- 日本機械学会 関西学生会学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conferenceStudy on Temperature Fluctuation Phenomena and Flow Phenomena in Pressurizer Spray Pipe of Pressurized Water ReactorOral presentation
- 日本機械学会 関西学生会学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conferenceStudy of Heat Transfer and Flow Characteristics of Gas-Liquid Two-Phase Flow in Plate-Fin Heat ExchangerOral presentation
- 日本機械学会 関西学生会学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conferenceStudy on the Effect of Size of Heat Exchenger on the COP in a Heat Pump Hot-Water Supply SystemOral presentation
- 宇宙利用シンポジウム(第28回), Jan. 2012, Japanese, 宇宙科学研究所, 相模原市, Domestic conference「きぼう」における強制流動沸騰実験に使用する実験装置についてOral presentation
- 第55回宇宙科学技術連合講演会, Dec. 2011, Japanese, 日本航空宇宙学会, Domestic conference「きぼう」での沸騰二相流実験に向けた地上実験ループ における熱伝達特性の解明Oral presentation
- 平成23年度宇宙航行の力学シンポジウム, Dec. 2011, Japanese, 宇宙科学研究所, 相模原市, Domestic conferenceきぼう利用実験「沸騰二相流体ループにおける気液界面挙動と熱伝達特性」プロジェクトの進捗報告Oral presentation
- 第55回宇宙科学技術連合講演会, Dec. 2011, Japanese, 日本航空宇宙学会, Domestic conferenceきぼう利用実験「沸騰二相流体ループにおける気液界面挙動と熱伝達特性」プロジェクトの進捗Oral presentation
- 関西・中部支部第48回合同秋期大会, Nov. 2011, Japanese, 日本航空宇宙学会, 神戸市, Domestic conferenceReduction in Wall Superheat Overshoot in Rapid Heating by a Thermal Spray CoatingOral presentation
- 日本冷凍空調学会近畿地区シンポジウム, Nov. 2011, Japanese, 日本冷凍空調学会, 大阪市, Domestic conference熱交換器の進化Invited oral presentation
- 日本マイクログラビティ応用学会第25回学術講演会, Nov. 2011, Japanese, 日本マイクログラビティ応用学会, 横浜市, Domestic conference「きぼう」における沸騰・二相流実験のための透明伝熱管試験部地上実験Oral presentation
- 日本マイクログラビティ応用学会第25回学術講演会, Nov. 2011, Japanese, 日本マイクログラビティ応用学会, 横浜市, Domestic conference「きぼう」における沸騰・二相流実験のための試験ループおよび地上実験Oral presentation
- 5th Kyushu Univ.-KAIST Symposium on Aerospace Engineering, Nov. 2011, Japanese, 九州大学, International conferencePreliminary Ground Test for the Experiments on Boiling and Two-phase Flow onboard International Space StationOral presentation
- 電気化学会 第52回電池討論会, Oct. 2011, Japanese, 電気化学会, 東京都, Domestic conferenceMeasurements of Water Distribution in Through-plane direction of a PEFC by using High Spatial-Resolution System on Neutron RadiographyOral presentation
- 熱工学コンファレンス2011, Oct. 2011, Japanese, 日本機械学会, 浜松市, Domestic conferenceStudy of Heat Transfer and Flow Characteristics of Gas-Liquid Two-Phase Flow in Plate-Fin Heat ExchangerOral presentation
- 日本冷凍空調学会 2011年度日本冷凍空調学会年次大会, Sep. 2011, Japanese, 日本冷凍空調学会, 東京都, Domestic conferenceStudy of Heat Transfer and Flow Characteristics of Gas-Liquid Two-Phase Flow in Plate-Fin Heat ExchangerOral presentation
- 2011年度日本冷凍空調学会年次大会, Sep. 2011, Japanese, 日本冷凍空調学会, 東京都, Domestic conferenceStudy of Heat Transfer and Flow Characteristics of Gas-Liquid Two-Phase Flow in Plate-Fin Heat ExchangerOral presentation
- 2011年度日本冷凍空調学会年次大会, Sep. 2011, Japanese, 日本冷凍空調学会, 東京都, Domestic conferenceFlow Characteristics of Decompression Boiling Two-Phase Flow in Capillary Tube, Effect of tube configurationOral presentation
- Sixth International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2011, Japanese, Heat Transfer International Research Institute, Cava Dei Tirreni, Italy;, International conferenceSubjects to be Clarified in ISS Experiment of Boiling Two-phase FlowOral presentation
- Sixth International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2011, Japanese, Heat Transfer International Research Institute, Cava Dei Tirreni, Italy;, International conferenceParabolic Flight Experiment of Flow Boiling in Transparent Heated TubeOral presentation
- Sixth International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2011, Japanese, Heat Transfer International Research Institute, Cava Dei Tirreni, Italy;, International conferenceExperiments of Flow Boiling Heat Transfer in Microgravity by Using Parabolic FlightOral presentation
- Sixth International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2011, Japanese, Heat Transfer International Research Institute, Cava Dei Tirreni, Italy;, International conferenceEquilibrium Estimation of The Ground Test Loop System for Interfacial Behaviors and Heat Transfer Characteristics in Boiling Two-Phase Flow (TPF)Oral presentation
- Sixth International Conference on Two-phase Systems for Ground and Space Applications, Sep. 2011, Japanese, Heat Transfer International Research Institute, Cava Dei Tirreni, Italy;, International conferenceEffect of Gravity on One-Component Two-Phase Flow Characteristics during Parabolic Trajectory FlightOral presentation
- 日本混相流学会 年会講演会2011, Aug. 2011, Japanese, 日本混相流学会, 京都市, Domestic conferenceThermal Hydraulic Characteristics in a Mechanical Pump Driven Two-Phase Flow Loop under Microgravity (Characteristics of adiabatic one-component two-phase flow)Oral presentation
- 日本混相流学会 年会講演会2011, Aug. 2011, Japanese, 日本混相流学会, 京都市, Domestic conferenceThermal Hydraulic Characteristics in a Mechanical Pump Driven Two-Phase Flow Loop under Microgravity (Response characteristics of two-phase flow loop to gravity change)Oral presentation
- 日本混相流学会 年会講演会2011, Aug. 2011, Japanese, 日本混相流学会, 京都市, Domestic conferenceThermal Hydraulic Characteristics in a Mechanical Pump Driven Two-Phase Flow Loop under Microgravity (Heat transfer characteristics of boiling two-phase flow in a copper heated tube)Oral presentation
- Proc. of Int. Conf. on Advanced Technology in Experimental Mechanics 2011 (ATEM’11), Aug. 2011, English, 日本機械学会, 神戸市, International conferenceQuantitative Measurements of Water Distribution in a PEFC by using Neutron Radiography and Analysis of Gas-velocity DistributionsOral presentation
- Proc. of Int. Conf. on Advanced Technology in Experimental Mechanics 2011 (ATEM’11), Aug. 2011, English, 日本機械学会, 神戸市, International conferenceMicrogravity Experiments during a Parabolic Flight of Airplane on One-Component Two-Phase Flow CharacteristicsOral presentation
- ASME-JSME-KSME Joint Fluids Engineering Conference, Jul. 2011, English, ASME; JSME; KSME, JSME, KSME, 浜松市, International conferenceVisualization and Void Fraction Measurement of Decompressed Boiling Flow in a Capillary TubeOral presentation
- 日本伝熱学会 第48回日本伝熱シンポジウム, Jun. 2011, Japanese, 日本伝熱学会, 岡山市, Domestic conferenceSubcooled Boiling Heat Transfer Characteristics in a Horizontal Narrow Channel with Thermal Spray CoatingOral presentation
- 日本機械学会 第16回動力・エネルギー技術シンポジウム, Jun. 2011, Japanese, 日本機械学会, 吹田市, Domestic conferenceA Cogeneration System for an Apartment Building using Distributed Heat Storage TechnologyOral presentation
- 日本機械学会 第16回動力・エネルギー技術シンポジウム, Jun. 2011, Japanese, 日本機械学会, 吹田市, Domestic conferenceThree-Dimensional Visualization and Measurement of Water Distributions in PEFC by Dynamic CT Method on Neutron RadiographyOral presentation
- 日本機械学会 第16回動力・エネルギー技術シンポジウム, Jun. 2011, Japanese, 日本機械学会, 吹田市, Domestic conferenceMeasurement of water distribution by using neutron radiography and network analysis of gas-velocity distributions in a PEFCOral presentation
- 日本伝熱学会 第48回日本伝熱シンポジウム, Jun. 2011, Japanese, 日本伝熱学会, 岡山市, Domestic conferenceImprovement in Condensate Removal by Surface Treatment of Heat Transfer Tubes in Latent Heat Recovery Heat ExchangerOral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都市, Domestic conference溶射皮膜による沸騰開始過熱度の低減Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都市, Domestic conference熱非平衡を伴うキャピラリーチューブ内の減圧沸騰流れに関する研究Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都市, Domestic conference中性子ラジオグラフィを用いたPEFC内における水分布の可視化・計測Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都市, Domestic conference中性子ラジオグラフィによる固体高分子型燃料電池内水分布計測Oral presentation
- 日本機械学会関西支部第86期定時総会講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都市, Domestic conferenceStudy on Freezing Phenomena of Water in a Porous Layer Used as Gas Diffusion Layer in PEFCOral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都市, Domestic conference潜熱回収熱交換器における微細溝による排水性向上に関する研究Oral presentation
- 宇宙利用シンポジウム(第27回), Mar. 2011, Japanese, 宇宙科学研究所, 相模原市, Domestic conference「きぼう」日本実験棟における沸騰二相流実験実施に向けた地上要素試験Oral presentation
- 宇宙航行の力学シンポジウム, Dec. 2010, Japanese, 宇宙科学研究所, 相模原市, Domestic conferenceきぼう利用実験「沸騰二相流ループにおける気液界面挙動と熱伝達特性」に関する地上検証実験Oral presentation
- 宇宙航行の力学シンポジウム, Dec. 2010, Japanese, 宇宙科学研究所, 相模原市, Domestic conferenceきぼう利用実験「沸騰二相流ループにおける気液界面挙動と熱伝達特性」に関するプロジェクト紹介Oral presentation
- The International Symposium on New Refrigerants and Environmental Technology 2010, Dec. 2010, English, 日本冷凍空調工業会, 神戸市, International conferenceBoiling Heat Transfer Enhancement by Thermal Spray CoatingPoster presentation
- 第54回宇宙科学技術連合講演会, Nov. 2010, Japanese, 日本航空宇宙学会, 静岡市, Domestic conferenceきぼう利用実験「沸騰二相流体ループにおける気液界面挙動と熱伝達特性」に関するプロジェクト紹介Oral presentation
- 第54回宇宙科学技術連合講演会, Nov. 2010, Japanese, 日本航空宇宙学会, 静岡市, Domestic conferenceきぼう利用実験「沸騰二相流体ループにおける気液界面挙動と熱伝達特性」における地上検証用ループ試験Oral presentation
- 第51回電池討論会, Oct. 2010, Japanese, 電気化学会, 名古屋市, Domestic conference中性子ラジオグラフィを用いたダイナミックCT計測による固体高分子形燃料電池内水挙動の三次元可視化Oral presentation
- 第51回電池討論会, Oct. 2010, Japanese, 電気化学会, 名古屋市, Domestic conference中性子ラジオグラフィを用いたPEFC内の水分布計測と気流分布解析Oral presentation
- 2010 JSRAE Annual Conference, Sep. 2010, Japanese, 金沢市, Domestic conferenceInspection of Refrigerant Behavior in Refrigerating System based on Flow Visualization by Neutron RadiographyInvited oral presentation
- 2010年度日本冷凍空調学会年次大会, Sep. 2010, Japanese, 日本冷凍空調学会, 金沢市, Domestic conferenceDelay in Boiling Inception during Flashing Flow in Capillary TubeOral presentation
- Fifth International Topical Workshop on Two-Phase Systems for Ground and Space Application, Sep. 2010, English, Heat Transfer International Research Institute, 京都市, International conferenceManufacture and Testing of BBM for the Experiments on Boiling and Two-phase Flow in International Space StationPoster presentation
- 8th Japan-China-Korea Workshop on Microgravity Sciences for Asian Microgravity Pre-Symposium, Sep. 2010, English, 日本マイクログラビティ応用学会, 仙台市, International conferenceCurrent Status of Development of a Heating Test Section using Transparent Heated Tubes for Boiling and Two-phase Flow Experiment in International Space StationOral presentation
- Fifth International Topical Workshop on Two-Phase Systems for Ground and Space Application, Sep. 2010, English, Heat Transfer International Research Institute, 京都市, International conferenceCharacteristics of One-Component Two-Phase Flow under MicrogravityPoster presentation
- Fifth International Topical Workshop on Two-Phase Systems for Ground and Space Application, Sep. 2010, English, Heat Transfer International Research Institute, 京都市, International conferenceBoiling Heat Transfer Enhancement by Thermal Spray Coating under Normal and Reduced GravityInvited oral presentation
- Fifth International Topical Workshop on Two-Phase Systems for Ground and Space Application, Sep. 2010, English, Heat Transfer International Research Institute, 京都市, International conferenceBoiling Heat Transfer Characteristics on Heat Transfer Enhancement Surface under MicrogravityPoster presentation
- 日本混相流学会 年会講演会2010, Jul. 2010, Japanese, 日本混相流学会, 浜松市, Domestic conferenceBoiling Heat Transfer Characteristics on Heat Transfer Enhancement Surface under MicrogravityOral presentation
- 日本混相流学会 年会講演会2010, Jul. 2010, Japanese, 日本混相流学会, 浜松市, Domestic conferenceCharacteristics of One-Component Two-Phase Flow under MicrogravityOral presentation
- 日本混相流学会 年会講演会2010, Jul. 2010, Japanese, 日本混相流学会, 浜松市, Domestic conferenceClarification of Dominant Force Regimes on Flow Boiling Heat Transfer by using Single Mini-TubesOral presentation
- 日本機械学会 第15回動力・エネルギー技術シンポジウム, Jun. 2010, Japanese, 日本機械学会, 東京都, Domestic conferenceEnergy Saving Effect of a Cogeneration System for an Apartment Building using Distributed Heat Storage TechnologyOral presentation
- 日本機械学会 第15回動力・エネルギー技術シンポジウム, Jun. 2010, Japanese, 日本機械学会, 東京都, Domestic conference中性子ラジオグラフィを用いたダイナミックCT技術によるPEFC内水分布の可視化Oral presentation
- 第17回燃料電池シンポジウム, May 2010, Japanese, 燃料電池開発情報センター, 東京都, Domestic conference中性子ラジオグラフィを用いたPEFC内水分布の計測と気流分布解析Oral presentation
- 日本伝熱学会 第47回日本伝熱シンポジウム, May 2010, Japanese, 日本伝熱学会, 札幌市, Domestic conferenceEffects of Tube Diameter on Heat Transfer Coefficient for Flow Boiling in a Single Mini-tubeOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2010, Japanese, 日本機械学会, 神戸市, Domestic conferenceStudy on Nucleate Boiling Heat Transfer Characteristics of Heating Surface with Thermal Spray CoatingOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2010, Japanese, 日本機械学会, 神戸市, Domestic conferenceThree-Dimensional Visualization of Water Behavior in PEFC by Neutron RadiographyOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2010, Japanese, 日本機械学会, 神戸市, Domestic conferenceMeasurement of Distribution of Water of Thickness Direction in PEFC by Neutron RadiographyOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2010, Japanese, 日本機械学会, 神戸市, Domestic conferenceA Study on Behavior of Condensate Water in Latent Heat Recovery Heat ExchangerOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2010, Japanese, 日本機械学会, 神戸市, Domestic conferenceA thermal design of compact producing target for accelerator,Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2010, Japanese, 日本機械学会, 神戸市, Domestic conferenceGravity Effect on One-Component Two-Phase Flow in a Small Diameter TubeOral presentation
- 第26回宇宙利用シンポジウム, Jan. 2010, Japanese, 宇宙科学研究所, 東京, Domestic conference単一細管内沸騰二相流の熱伝達係数に対する力の支配領域の特定に関する実験的研究Oral presentation
- 第26回宇宙利用シンポジウム, Jan. 2010, Japanese, 宇宙科学研究所, 東京, Domestic conference国際宇宙ステーション「きぼう」での強制流動沸騰実験に向けたBBMの開発Oral presentation
- 日本機械学会熱工学コンファレンス2009, Nov. 2009, Japanese, 日本機械学会, 宇部市, Domestic conferenceMeasurement of Distribution of Water of Thickness Direction in PEFC by Neutron RadiographyOral presentation
- 日本マイクログラビティ応用学会 第24回学術講演会, Oct. 2009, Japanese, 日本マイクログラビティ応用学会, 沖縄, Domestic conferenceOn the Dominant Force Regime Map for Flow Boiling Heat Transfer in a Single Mini-TubeOral presentation
- 日本マイクログラビティ応用学会 第24回学術講演会, Oct. 2009, Japanese, 日本マイクログラビティ応用学会, 沖縄, Domestic conference国際宇宙ステーション「きぼう」での沸騰・二相流実験に向けたBBM の製作Oral presentation
- 2009年度日本冷凍空調学会年次大会, Oct. 2009, Japanese, 日本冷凍空調学会, 東京, Domestic conferenceVisualization and Void Fraction Measurement of HCFC134a Two-Phase Flow in a Capillary TubeOral presentation
- 化学工学会 第41回秋季大会, Sep. 2009, Japanese, 化学工学会, 広島, Domestic conference熱交換器の高性能化技術と今後の展望Invited oral presentation
- Fourth International Topical Workshop on Two-Phase Systems for Ground and Space Application, Sep. 2009, English, Novosibirsk, International conferenceResearch Subjects and Proposed Experimental Setup for Flow Boiling in MicrogravityOral presentation
- 日本混相流学会年会講演会 2009, Aug. 2009, Japanese, 日本混相流学会, 熊本市, Domestic conferenceStudy on drag reduction effectsOral presentation
- 日本冷凍空調学会 「CO2を含む将来冷媒の先進熱交換器に関する調査研究」プロジェクト第9回委員会, Aug. 2009, Japanese, 日本冷凍空調学会, 東京, Domestic conferenceStudy on Gas-Liquid Two-Phase Flow in a Tube (Effect of centrifugal force on phase distribution in a spiral tube and thermal non-equilibrium in flashing flow through a capillary tube)Invited oral presentation
- 日本混相流学会 年会講演会2009, Aug. 2009, Japanese, 日本混相流学会, 熊本市, Domestic conferenceGravity Effect on One-Component Two-Phase Flow in a Small Diameter TubeOral presentation
- 日本混相流学会年会講演会 2009, Aug. 2009, Japanese, 日本混相流学会, 熊本市, Domestic conferenceStudy on Temperature Fluctuation Phenomena in a Branch Pipe of Nuclear ReactorOral presentation
- 日本混相流学会年会講演会 2009, Aug. 2009, Japanese, 日本混相流学会, 熊本市, Domestic conferenceStudy on temperature fluctuation phenomena in pressurizer bent pipe of pressurized water reactorOral presentation
- ヒートパイプ協会 総会講演会, Jul. 2009, Japanese, ヒートパイプ協会, 東京, Domestic conferenceVisualization and Measuremnt of Refrigerant Behavior in Heat PipesInvited oral presentation
- 日本伝熱学会 第46回日本伝熱シンポジウム, Jun. 2009, Japanese, 日本伝熱学会, 京都市, Domestic conferenceEffect of Channel Orentation on Boiling Heat Transfer in a Narrow Channel with a Thermal Spray CoatingOral presentation
- 日本機械学会 第14回動力・エネルギー技術シンポジウム, Jun. 2009, Japanese, 日本機械学会, つくば市, Domestic conferenceStudy on Central Heat Supply System for Multiple Dwelling HousesOral presentation
- 日本伝熱学会 第46回日本伝熱シンポジウム, Jun. 2009, Japanese, 日本伝熱学会, 京都市, Domestic conferenceDevelopment of a Method for Stable Behavior of a Variable Conductance Heat Pipe - 1st report; Visualization of refrigerant behavior by neutron radiographyOral presentation
- 日本伝熱学会 第46回日本伝熱シンポジウム, Jun. 2009, Japanese, 日本伝熱学会, 京都市, Domestic conferenceDevelopment of a Method for Stable Behavior of a Variable Conductance Heat Pipe - 1st report; Evaluation of effect of gas-liquid separatorOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference溶射皮膜による核沸騰伝熱促進における伝熱面姿勢に関する研究Oral presentation
- 日本機械学会関西支部第84期定時総会講演会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference熱連係を用いた分散型エネルギー供給システムの実現に向けた研究Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference中性子ラジオグラフィによる高空間分解能定量計測技術の開発Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference中性子ラジオグラフィによるダイナミックCT計測技術の開発Oral presentation
- 日本機械学会関西支部第84期定時総会講演会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference集合住宅用セントラル熱供給システムに関する研究Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conferenceプレート熱交換器内沸騰二相流の熱流動特性に及ぼす流動方向の影響Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conferenceガス給湯器用潜熱回収熱交換器での結露水挙動の観察Oral presentation
- 2008年度日本冷凍空調学会年次大会, Oct. 2008, Japanese, 日本冷凍空調学会, 大阪, Domestic conference溶射加工による沸騰伝熱促進面を有する狭隘流路熱伝達特性 -加熱面姿勢の影響-Oral presentation
- 2008年度日本冷凍空調学会年次大会, Oct. 2008, Japanese, 日本冷凍空調学会, 大阪, Domestic conferenceプレート式蒸発器の熱流動特性に及ぼす流動方向の影響Oral presentation
- 第418回航空懇談会, Sep. 2008, Japanese, 日本航空宇宙学会, 神戸, Domestic conference蒸発潜熱を利用した宇宙機器の冷却システムへの取り組み/A Study on Thermal Control System for Space Structure[Invited]Invited oral presentation
- The 6th Int. Topical Meeting on Neutron Radiography, Sep. 2008, English, Int. Society for Neutron Radiography, Kobe, International conferenceVisualization of Oil Behavior in a Small 4-cycle Engine by Electrical MotoringPoster presentation
- The 6th Int. Topical Meeting on Neutron Radiography, Sep. 2008, English, Int. Society for Neutron Radiography, Kobe, International conferenceTime Resolved Neutron TomographyPoster presentation
- The 6th Int. Topical Meeting on Neutron Radiography, Sep. 2008, English, Int. Society for Neutron Radiography, Kobe, International conferenceThree-Dimensional Observation of Water Distribution in PEFC by Neutron CTPoster presentation
- The 6th Int. Topical Meeting on Neutron Radiography, Sep. 2008, English, Int. Society for Neutron Radiography, Kobe, International conferenceNondestructive Inspection for Boiling Flow in Plate Heat Exchanger by Neutron RadiographyOral presentation
- The 6th Int. Topical Meeting on Neutron Radiography, Sep. 2008, English, Int. Society for Neutron Radiography, Kobe, International conferenceFlow Visualization of Refrigerant in a Self-Vibration Heat Pipe by Neutron RadiographyPoster presentation
- The 6th Int. Topical Meeting on Neutron Radiography, Sep. 2008, English, Int. Society for Neutron Radiography, Kobe, International conferenceEvaluation of Water Distribution Effect on Performances of JARI Standard PEFC by using Neutron RadiographyOral presentation
- 混相流学会年会講演会2008, Aug. 2008, Japanese, 日本混相流学会, 会津若松市, Domestic conferenceEffect of heating position on boiling heat transfer in horizontal narrow channel with thermal spray coatingOral presentation
- 混相流学会年会講演会2008, Aug. 2008, Japanese, 日本混相流学会, 会津若松市, Domestic conferenceEffect of flow direction on void fraction of one-component two-phase flow in a single channel plate heat exchangerOral presentation
- 平成20年度工学・工業教育研究講演会, Aug. 2008, Japanese, 日本工学教育協会, 神戸, Domestic conference神戸大学機械工学科におけるものづくり導入教育Oral presentation
- 第19回東海伝熱セミナー, Aug. 2008, Japanese, 日本伝熱学会, 南知多町, Domestic conferenceプレート熱交換器内の気液二相流の熱流動特性[Invited]Invited oral presentation
- 第45回アイソトープ・放射線研究発表会, Jul. 2008, Japanese, 日本アイソトープ協会, 東京, Domestic conferenceVisualization and Measurement of Water Distribution in JARI Standard PEFC by using Neutron RadiographyOral presentation
- 第45回日本伝熱シンポジウム, May 2008, Japanese, 日本伝熱学会, つくば市, Domestic conferenceA Study on Boiling Heat Transfer on Thermal Spray CoatingOral presentation
- 第45回日本伝熱シンポジウム, May 2008, Japanese, 日本伝熱学会, つくば市, Domestic conferenceVisualization of a self-vibration heat pipe by neutron radiographyOral presentation
- 第45回日本伝熱シンポジウム, May 2008, Japanese, 日本伝熱学会, つくば市, Domestic conferenceVisualization of oil flow in engine by neutron radiographyOral presentation
- 第45回日本伝熱シンポジウム, May 2008, Japanese, 日本伝熱学会, つくば市, Domestic conferenceEffect of Flow Direction on Boiling Heat Transfer Characteristics in Plate Heat ExchangerOral presentation
- 第45回日本伝熱シンポジウム, May 2008, Japanese, 日本伝熱学会, つくば市, Domestic conferenceCorrelation between Change in Cell Voltage and Pressure Drop, and Water Distribution in PEFC(In-situ visualization and measurement by neutron radiography)Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceStudy on nucleate boiling heat transfer enhacement by thermal spray coatingOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceVisualization and measurement of water distribution in PEFC by Neutron RadiographyOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceVisualization and measurement of water distribution in PEFC by Neutron RadiographyOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceA study on neighboring communities co-generation system with distributed hot waterOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceStudy on drag reduction by micro bubbleOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceFlow characteristics of boiling two-phase flow in a plate Heat ExchangerOral presentation
- 日本機械学会関西学生会学生員卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 吹田市, Domestic conferenceA study on compactification of latent heat recovery heat exchanger for gas water heaterOral presentation
- 第3回 IEA Annex 33 分科会, Feb. 2008, Japanese, ヒートポンプ・蓄熱センター, 東京, Domestic conferenceプレート熱交換器内の熱流動特性について[Invited]Invited oral presentation
- 宇宙利用シンポジウム(第24回), Jan. 2008, Japanese, 日本学術会議, 東京, Domestic conferenceA Study on Heat Transfer Enhancement of Boiling Two-Phase Flow in a Narrow Channel by Thermal Spray CoatingPoster presentation
- 熱工学カンファレンス2007, Nov. 2007, Japanese, 日本機械学会, 京都市, Domestic conferenceA Study on Compactification of Latent Heat Recovery Heat Exchanger for Gas Water HeaterOral presentation
- The Second International Topical Team Workshop on Two-Phase Systems for Ground and Space Applications, Oct. 2007, English, 京都市, International conferenceEffect of Gravity on Pool Boiling Heat Transfer on Thermal Spray CoatingPoster presentation
- 日本混相流学会年会講演会2007, Jul. 2007, Japanese, 日本混相流学会, 札幌市, Domestic conferenceA Study of Boiling Heat Transfer in a Narrow Channel with a Thermal Spray CoatingOral presentation
- 日本混相流学会年会講演会2007, Jul. 2007, Japanese, 日本混相流学会, 札幌市, Domestic conference細管内気液二相流のボイド率特性Oral presentation
- 日本混相流学会年会講演会2007, Jul. 2007, Japanese, 日本混相流学会, 札幌市, Domestic conference界面活性剤による摩擦損失低減効果に関する研究Oral presentation
- 第12回動力・エネルギー技術シンポジウム, Jun. 2007, Japanese, 日本機械学会, 東京, Domestic conferenceStudy of Heat Supply System Using Distributed Heat Storage Unit for a Multiple Dwelling HousesOral presentation
- 第12回動力・エネルギー技術シンポジウム, Jun. 2007, Japanese, 日本機械学会, 東京, Domestic conferenceVisualization and Measurement of Water Distribution in PEFC by Neutron RadiographyOral presentation
- 44th National Heat Transfer Sympojium of Japan, May 2007, Japanese, 日本伝熱学会, 長崎, Domestic conferenceIn Situ Measurement of Water Distribution in Operating PEFC by Neutron RadiographyOral presentation
- 44th National Heat Transfer Sympojium of Japan, May 2007, Japanese, 日本伝熱学会, 長崎, Domestic conferenceA Study on Thermal Hydraulic Characteristics of a Paraffin EmulsionOral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2007, Japanese, 日本機械学会, 大東市, Domestic conference摩擦損失低減効果発生機構の解明Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2007, Japanese, 日本機械学会, 大東市, Domestic conference中性子ラジオグラフィを用いた固体高分子型燃料電池内の結露水挙動の可視化と計測Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2007, Japanese, 日本機械学会, 大東市, Domestic conference集合住宅用コージェネレーションシステムの開発Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2007, Japanese, 日本機械学会, 大東市, Domestic conference給湯器用潜熱回収熱交換器の最適設計Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2007, Japanese, 日本機械学会, 大東市, Domestic conference気液二相流のボイド率における管内径の影響Oral presentation
- 日本機械学会関西学生会学生員卒業研究発表講演会, Mar. 2007, Japanese, 日本機械学会, 大東市, Domestic conferenceプラント内の曲がり配管における温度変動現象に関する研究Oral presentation
- 熱工学カンファレンス2006, Nov. 2006, Japanese, 日本機械学会, 横浜市, Domestic conferenceBoiling Heat Transfer Characteristics in Rapid Heating for a Cold-Plate with Thermal Spray CoatingOral presentation
- 熱工学カンファレンス2006, Nov. 2006, Japanese, 日本機械学会, 横浜市, Domestic conferenceA Study of Thermal Hydraulic Characteristics of a Paraffin EmulsionOral presentation
- 熱工学カンファレンス2006, Nov. 2006, Japanese, 日本機械学会, 横浜市, Domestic conferenceA Study on Compactification of Latent Heat Recovery Heat Exchanger for Gas Water HeaterOral presentation
- 日本冷凍空調学会年次大会, Oct. 2006, Japanese, 日本冷凍空調学会, 福岡市, Domestic conferenceBoiling Heat Transfer in a Narrow Channel with Thermal Spray CoatingOral presentation
- 日本冷凍空調学会年次大会, Oct. 2006, Japanese, 日本冷凍空調学会, 福岡市, Domestic conferenceEffect of Flow Direction on Boiling Heat Transfer in a Plate Heat ExchangerOral presentation
- the 8th World Conference on Neutron Radiography, Oct. 2006, Japanese, International Society for Neutron Radiography, Gaithersburg, USA, International conferenceVoid Fraction Characteristic of Gas-Two Liquid Two-Phase Flow in Mini-ChannelsPoster presentation
- the 8th World Conference on Neutron Radiography, Oct. 2006, Japanese, International Society for Neutron Radiography, Gaithersburg, USA, International conferenceVisualization and Measurement of Hygroscopic Water Distribution in a Unit Cell of Silica-Gel Adsorber by Neutron RadiographyPoster presentation
- the 8th World Conference on Neutron Radiography, Oct. 2006, Japanese, International Society for Neutron Radiography, Gaithersburg, USA, International conferenceVisualization and Measurement of Dynamic Water Behavior in PEFC by Neutron RadiographyOral presentation
- 日本混相流学会年会講演会, Aug. 2006, Japanese, 日本混相流学会, 金沢市, Domestic conferenceA Study of Boiling Heat Transfer in a Narrow Channel with a Thermal Spray CoatingOral presentation
- 日本混相流学会年会講演会, Aug. 2006, Japanese, 日本混相流学会, 金沢市, Domestic conferenceDynamic Characteristics and Its Control of Two-Phase Flow Loop[Invited]Invited oral presentation
- 日本混相流学会年会講演会, Aug. 2006, Japanese, 日本混相流学会, 金沢市, Domestic conferenceEffects of Tube Inside Diameter on the Void Fraction in Gas-Liquid Two-Phase FlowOral presentation
- 日本混相流学会年会講演会, Aug. 2006, Japanese, 日本混相流学会, 金沢市, Domestic conferenceHeat Transfer Characteristics of Boiling Two-Phase Flow in a Plate Heat ExchangerOral presentation
- 43rd National Heat Transfer Sympojium of Japan, May 2006, Japanese, 日本伝熱学会, Nagoya, Domestic conference中性子ラジオグラフィによる固体高分子形燃料電池内結露水挙動の可視化と計測Oral presentation
- 43rd National Heat Transfer Sympojium of Japan, May 2006, Japanese, 日本伝熱学会, 名古屋市, Domestic conferenceVisualization and Measurement of Dynamic Water Behavior in PEFC by Neutron RadiographyOral presentation
- 日本機械学会関西支部第81期定時総会講演会, Mar. 2006, Japanese, 日本機械学会関西支部, 京都, Domestic conference垂直多分岐管内気液二相流の可視化とボイド率分布Oral presentation
- 第22回エネルギーシステム・経済・環境コンファレンス, Jan. 2006, Japanese, エネルギー・資源学会, 東京, Domestic conference隣組コージェネレーションシステム用ハイブリッド小型蓄熱給湯器の性能評価Oral presentation
- 日本マイクログラビティ応用学会 学術講演会 JASMAC-21, Jan. 2006, Japanese, 日本マイクログラビティ応用学会, 札幌, Domestic conference濡れ性が高いマイクロストラクチャを有する沸騰伝熱促進面における気泡核生成とその離脱に関する研究Oral presentation
- 第55回理論応用力学講演会, Jan. 2006, Japanese, 第55回理論応用力学講演会運営委員会, 京都, Domestic conference中性子ラジオグラフィによる気液二相流の可視化と計測Oral presentation
- 第49回宇宙科学技術連合講演会, Nov. 2005, Japanese, 日本航空宇宙学会, 広島, Domestic conference溶射皮膜を利用した沸騰伝熱促進に関する研究（微小重力下での実験結果）Oral presentation
- 熱工学コンファレンス, Oct. 2005, Japanese, 日本機械学会熱工学部門, 岐阜, Domestic conference融点の幅が広いパラフィンワックスの蓄放熱特性に関する研究Oral presentation
- 熱工学コンファレンス, Oct. 2005, Japanese, 日本機械学会熱工学部門, 岐阜, Domestic conference平滑管群潜熱回収熱交換器の性能特性に関する研究Oral presentation
- 2005年度日本冷凍空調学会 年次大会講演会, Oct. 2005, Japanese, 日本冷凍空調学会, 東京, Domestic conference中性子ラジオグラフィ法によるシリカゲルユニットセル内湿分分布の可視化と計測Oral presentation
- 2005年度日本冷凍空調学会 年次大会講演会, Oct. 2005, Japanese, 日本冷凍空調学会, 東京, Domestic conference実用プレート熱交換器内空気－水二相流の流動特性に関する研究（単一流路内垂直上昇および下降流）Oral presentation
- 日本機械学会関西支部秋季技術フォーラム, Oct. 2005, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceエネルギーに関する教育カリキュラムと研究の紹介Oral presentation
- 日本機械学会 2005年度年次大会講演会, Sep. 2005, Japanese, 日本機械学会, Domestic conference隣組コージェネレーションシステム用単ループ熱供給システムの開発（蓄熱ユニットの性能評価）Oral presentation
- 日本混相流学会 年会講演会, Aug. 2005, Japanese, 日本混相流学会, 東京, Domestic conference稠密格子内の気液二相流のボイド率分布Oral presentation
- 日本混相流学会 年会講演会, Aug. 2005, Japanese, 日本混相流学会, 東京, Domestic conference溶射皮膜による核沸騰伝熱促進に関する研究（微小重力場でのプール沸騰実験結果）Oral presentation
- 日本混相流学会 年会講演会, Aug. 2005, Japanese, 日本混相流学会, 東京, Domestic conferenceワイヤーコイル挿入による水平管内沸騰二相流の流動特性Oral presentation
- 日本混相流学会 年会講演会, Aug. 2005, Japanese, 日本混相流学会, 東京, Domestic conferenceプレート熱交換器内気液二相流の流動特性（中性子ラジオグラフィによる実製品内下降流の可視化）Oral presentation
- 42nd National Heat Transfer Sympojium of Japan, Jun. 2005, Japanese, 日本伝熱学会, Sendai, Domestic conferenceStudy of Nucleate Boiling Heat Transfer Enhancement by Thermal Spray Coating (Experimental results of pool boiling under microgravity)Oral presentation
- 42nd National Heat Transfer Sympojium of Japan, Jun. 2005, Japanese, 日本伝熱学会, Sendai, Domestic conferenceVisualization of Hygroscopic Water Distribution in a Silica Gel Particle Bed by Neutron RadiographyOral presentation
- 第42回日本伝熱シンポジウム, Jun. 2005, Japanese, 日本伝熱学会, 仙台, Domestic conferenceワイヤーコイル挿入による水平管内沸騰熱伝達の促進Oral presentation
- 化学工学会関西支部「環境・廃棄物研究会」・「資源・エネルギー研究会」合同研究会, 2005, Japanese, 化学工学会関西支部, 未記入, Domestic conference集合住宅用子ジェネレーションシステムへの取り組みOral presentation
- 中性子ラジオグラフィ専門研究会, 2004, Japanese, 未記入, 未記入, Domestic conference冷凍空調分野における応用Oral presentation
- 日本伝熱学会関西支部講演討論会, 2004, Japanese, 日本伝熱学会関西支部, 未記入, Domestic conference溶射皮膜による核沸騰伝熱促進Oral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conference相変化材を利用したコジェネレーション用熱供給ユニットの開発Oral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conference潜熱利用流体ループ式排熱システムにおける弁操作による温度制御に関する研究Oral presentation
- 日本機械学会関西支部第79期定時総会講演会, 2004, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conference潜熱利用流体ループ式熱制御システムの動特性に関する研究Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, 2004, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conference潜熱利用流体ループ式熱制御システムの動特性に関する研究Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, 2004, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conference集合住宅用コジェネレーションシステムの熱供給シミュレーションOral presentation
- 日本混相流学会年会講演会, 2004, Japanese, 日本混相流学会, 岡山大学, Domestic conference宇宙用二相排熱ループにおける熱式アキュムレータの制御特性Oral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conference宇宙用潜熱利用排熱システムにおけるアキュムレータ制御特性Oral presentation
- 日本混相流学会年会講演会, 2004, Japanese, 日本混相流学会, 岡山大学, Domestic conferenceワイヤーコイル挿入による垂直管内沸騰熱伝達と液膜挙動の関係Oral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conferenceワイヤーコイル挿入による垂直管内沸騰伝熱促進とそのメカニズムOral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conferenceミニチャネル内の熱流動特性に関する研究Oral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conferenceマイクロストラクチュアによる核沸騰伝熱促進Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, 2004, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conferenceプール沸騰伝熱促進面の開発Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, 2004, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conferenceパラフィンの融解熱を利用した温熱蓄熱に関する研究Oral presentation
- 第41回日本伝熱シンポジウム, 2004, Japanese, 日本伝熱学会, 富山, Domestic conferenceキャピラリーポンプループの性能特性に関する研究Oral presentation
- 5th Int.Topical Meeting on Neutron Radiography, 2004, English, 未記入, 未記入, International conferenceVisualization of Hygroscopic Water Distribution in an Absorbent Bed By Neutron RadiographyOral presentation
- 5th Int.Topical Meeting on Neutron Radiography, 2004, English, 未記入, 未記入, International conferenceVisualization and Void Fraction Distribution of Downward Gas-Liquid Two-Phase Flow in a Plate Heat Exchanger by Neutron RadiographyOral presentation
- 日本機械学会関西学生会卒業研究発表講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conference分岐管内の水撃現象に関する研究Oral presentation
- 日本機械学会関西支部第78期定時総会講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conference分岐管における空気混入およびオリフィスによる水撃現象への影響に関する研究Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conference微笑重力における垂直管内の気液二相流の流動特性に関する研究Oral presentation
- 日本機械学会関西支部第78期定時総会講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conference潜熱利用流体ループ式熱制御システムにおけるポンプ駆動式アキュムレーターの開発Oral presentation
- 日本機械学会関西支部第78期定時総会講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conference冠水管への蒸気流入によるウォーターハンマー現象に関する研究Oral presentation
- 日本機械学会関西支部第78期定時総会講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conference宇宙用排熱システムにおけるガス圧駆動アキュムレーターの開発Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceマイクロチャンネル内の熱伝達特性に関する研究Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceキャピラリーポンプループ（CPL）の性能特性試験Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceガスタービンコージェネレーションシステムにおける最小化評価法Oral presentation
- 日本機械学会関西支部第78期定時総会講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceT及びY字分岐管による気液二相流の相分離特性に関する研究Oral presentation
- 日本機械学会関西学生会卒業研究発表講演会, Mar. 2003, Japanese, 日本機械学会関西支部, 大阪, Domestic conferenceT及びY字分岐管による気液二相流の相分離特性に関する研究Oral presentation
- 日本機械学会関西支部第4回秋季技術交流フォーラム, 2003, Japanese, 日本機械学会関西支部, 未記入, Domestic conference民生用コージェネレーションへの蓄熱技術の適用開発Oral presentation
- 神戸大学工学振興会機械倶楽部「若手教官は今」講演会, 2003, Japanese, 神戸大学工学振興会, 未記入, Domestic conference分散型電源対応次世代熱供給システムの開発Oral presentation
- 熱工学コンファレンス, 2003, Japanese, 日本機械学会熱工学部門, 金沢大学, Domestic conference地域コミュニティー発電の導入に向けてOral presentation
- 第47回宇宙科学技術連合講演会, 2003, Japanese, 日本航空宇宙学会, 新潟コンベンションセンター, Domestic conference潜熱利用流体排熱システムにおける蒸気弁操作による温度制御Oral presentation
- 第42回日本伝熱シンポジウム, 2003, Japanese, 日本伝熱学会, 広島, Domestic conference潜熱利用流体ループ式熱制御システムの動特性Oral presentation
- 第41回日本伝熱シンポジウム, 2003, Japanese, 日本伝熱学会, 広島, Domestic conferenceプレート熱交換器内気液二相流の流動特性Oral presentation
- 中性子ラジオグラフィ専門研究会, 2003, Japanese, 未記入, 未記入, Domestic conferenceシリカゲル充填層内の湿分分布計測の試みOral presentation
- 第43回日本伝熱シンポジウム, 2003, Japanese, 日本伝熱学会, 広島, Domestic conferenceカプセル式蓄熱槽の蓄放熱性能に関するシミュレーション検討Oral presentation
- 第40回日本伝熱シンポジウム, 2003, Japanese, 日本伝熱学会, 広島, Domestic conferenceT字及びY字分岐管における気液分離性能特性Oral presentation
- 第44回日本伝熱シンポジウム, 2003, English, 日本伝熱学会, 広島, Domestic conferencePool Boiling Heat Transfer Enhancement Using Plasma Spray Coating.Oral presentation
- International Conference on Power Engineering-03, 2003, English, 未記入, Kobe, Domestic conferenceDevelopment of the New Heat Supply Unit for the Neighboring Communities Co-generation SystemOral presentation
- Deutsche Kalte-Klima-Tagung, 2003, German, 未記入, 未記入, International conferenceBehaltersieden an plasmabeschichteten Rohren.Oral presentation
■ Research Themes
- 学術研究助成基金助成金／基盤研究(C), Apr. 2016 - Mar. 2019, Principal investigatorCompetitive research funding
- 科学研究費補助金／基盤研究(C), Apr. 2012 - Mar. 2015, Principal investigatorCompetitive research funding
- 科学研究費補助金／基盤研究(C), 2009, Principal investigatorCompetitive research funding
- 科学研究費補助金／基盤研究(C), 2005, Principal investigatorCompetitive research funding
- 科学研究費補助金／萌芽研究, 2005Competitive research funding