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杉本 勝美大学院工学研究科 機械工学専攻助教
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- Abstract Rapid cooling of reactants quenches the intermediate state of chemical reactions and enables the synthesis of novel materials that cannot be realized by thermodynamic equilibrium processes. In this study, we estimated the cooling rate of reactant solutions during the supercritical hydrothermal synthesis of metal oxide nanoparticles. Neutron radiography measurements were performed to visualize the profile of the average water density at a junction where a stream of heated water was mixed with another stream of cooling water. The cooling rate of the heated water that mimicked the reactant solution was estimated using the relationship between the density and temperature of water under constant pressure conditions. This result should provide vital information about the flow-type synthesis of novel metal oxide nanoparticles.IOP Publishing, 2023年09月, Journal of Physics: Conference Series, 2605(1) (1), 012029 - 012029研究論文（学術雑誌）
- 2023年, Reaction Chemistry & Engineering研究論文（学術雑誌）
- Elsevier BV, 2022年12月, International Journal of Heat and Mass Transfer, 198, 123423 - 123423研究論文（学術雑誌）
- Japan Society of Mechanical Engineers, 2022年, Mechanical Engineering Journal, 9(4) (4), 22 - 00069研究論文（学術雑誌）
- Falling film evaporators have been expected as an alternative to flooded evaporators for reducing the refrigerant usage. It is important for the enhancement of the film evaporation heat transfer to keep a liquid film and promote nucleate boiling in the liquid film. This study focused on nucleate boiling heat transfer in the liquid film by thermal spray coating that can be applied regardless of the material of heat transfer tubes. The heat transfer performance of falling film evaporation on a horizontal copper tube was experimentally evaluated. Since nucleate boiling phenomena, such as activation of nucleation sites and bubble behaviors in the liquid film, strongly depend on the physical properties of the refrigerant, the experimental results for R1233zd(E), one of the alternative refrigerants with low GWP, were compared with those for R134a. Two types of tubes were used: the smooth tube and the thermal spray coated tube fabricated by an arc wire spraying method, with the outer diameter of 19.05 mm and the heating length of 50 mm. Pool boiling experiments were also conducted to confirm the wall superheat for nucleate boiling. The heat transfer coefficients were evaluated with a film mass flow rate range of 8.5 x 10-3 to 6.3 x 10-2 kg/(m.s), a heat flux range of 10 to 85 kW/m2, and a saturation temperature at 20 degrees C. The effects of the structure of the heating surface, heat flux, and thermophysical properties of the refrigerant on the heat transfer performance are discussed. Results show that the heat transfer of the falling film became the nucleate boiling dominant with a sufficient heat flux and liquid film flow rate. The thermal spray coated surface enhanced not only the nucleate boiling but also the liquid spreading by the vapor bubbles in the liquid film, and thus the coated tube produced higher heat transfer coefficients of 2.1 to 4.8 times those for the smooth tube. The wall superheat at the onset of nucleate boiling was higher for R1233zd(E) than for R134a, because R1233zd(E) has a higher surface tension and lower vapor density. Thus, the pool boiling and falling film evaporation heat transfer coefficients were lower for R1233zd(E) than for R134a.PERGAMON-ELSEVIER SCIENCE LTD, 2021年09月, APPLIED THERMAL ENGINEERING, 196, 英語研究論文（学術雑誌）
- Elsevier BV, 2021年08月, Flow Measurement and Instrumentation, 80, 101997 - 101997, 英語研究論文（学術雑誌）
- 日本冷凍空調学会, 2021年, 日本冷凍空調学会論文集 = Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers, 38(2) (2), 133 - 143, 日本語溶射被膜を有するローフィン管のR 134aおよびR 1233zd(E)における水平管外流下液膜蒸発熱伝達
- Elsevier BV, 2020年11月, Chemical Engineering Science, 225, 115816 - 115816, 英語[査読有り]研究論文（学術雑誌）
- Boiling heat transfer characteristics in horizontal in-line tube bundle with partially inserted heat transfer enhanced tube by thermal spray coatingBoiling heat transfer characteristics of HFC-245fa in a horizontal in-line tube bundle was experimentally investigated. Since nucleate boiling heat transfer is affected by bubble behaviors and generated bubble size depends on the heat transfer surface characteristics, boiling heat transfer enhanced tubes coated by thermal spraying of chromium alloy were installed at the first low from the inlet of the tube bundle to form homogeneous bubble flows with smaller diameter bubbles. The tube bundle was placed in a vertical duct with the cross-section of 90 × 90 mm2. Copper heating tubes with the outer diameter of 15 mm were horizontally installed with a 3 × 8 in-line array and a pitch of 22.5 mm. The tubes were heated by inserted cartridge heaters with constant heat flux. Measurements were carried out at the saturation temperature at 20 °C and the mass flux of 16 kg/(m2･s) for varied heat flux of 0.5 to 60 kW/m2. As a result, heat transfer enhancement due to bubble agitation was observed at the downstream of the thermal sprayed tube under the low heat flux condition. Under the high heat flux condition, the bubble agitation effect was not observed because the heat transfer was dominated by boiling on the heat transfer surface.International Conference on Power Engineering-2019, 2020年, ICOPE 2019 - 7th International Conference on Power Engineering, Proceedings, 767 - 772, 英語研究論文（国際会議プロシーディングス）
- Japan Society of Mechanical Engineers, 2020年, Mechanical Engineering Journal, 7(4) (4), 20 - 00131研究論文（学術雑誌）
- 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.2020年, Materials Research Proceedings, 15, 274 - 280研究論文（国際会議プロシーディングス）
- 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.2020年, Materials Research Proceedings, 15, 268 - 273研究論文（国際会議プロシーディングス）
- 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 > 1.2020年, ICOPE 2019 - 7th International Conference on Power Engineering, Proceedings, 829 - 832[査読有り]研究論文（国際会議プロシーディングス）
- 2020年, Experimental Thermal and Fluid Science, 112, 109957, 英語[査読有り]研究論文（学術雑誌）
- © 2018 Elsevier Ltd Neutron radiography can visualize heavy oil flows in metallic reactors used to upgrade heavy oils. Thus, we visualized heavy oil flows in a packed bed using real-time neutron radiography to support its capability and to offer basic experimental data necessary for verification and validation of numerical simulations. Atmospheric residue was used as the heavy oil sample and heavy oil and N 2 gas were concurrently supplied into a packed bed from above a reactor simulating a trickle bed reactor. Reactor temperatures were set at either 100°C or 250°C to change heavy oil viscosity. The heavy oil flow rate was kept constant at 2.5 mL/min and the N 2 gas flow rate was set at either 1 L/min or 3 L/min at 25°C. A series of neutron radiography experiments was conducted at the B-4 neutron imaging facility in the Kyoto University Research Reactor (KUR) with a thermal neutron flux of 5 × 10 7 n/cm 2 ⋅s. We performed image processing for the neutron radiographs to calculate neutron beam attenuation and clarify flow behavior. Visualization results show differences in flow behavior depending on operating factors. Temperature had a particularly substantial effect on flow behavior because heavy oil viscosity depends strongly on temperature. The flows also showed different behaviors for 1 mm and 3 mm packed particle sizes because the void ratios in the packed bed, which were preliminarily observed by X-ray computational tomography (CT), change with particle size. Channeling flow was observed with 3 mm particles and a temperature of 250°C. Furthermore, this work suggests that neutron radiography can be used to investigate heavy oil flows in metallic reactors.2019年03月, Chemical Engineering Science, 196, 425 - 432, 英語[査読有り]研究論文（学術雑誌）
- 2019年03月, The 6th International Conference of Saving Energy in Refrigeration and Air-Conditioning, 英語Heat transfer enhancement of falling film evaporation on a horizontal tube by thermal spraying[査読有り]研究論文（国際会議プロシーディングス）
- 2019年01月, KURNS-EKR (Web), (3) (3), 55‐59 (WEB ONLY), 日本語中性子イメージングの高度化
- © 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.2018年08月, Nuclear Engineering and Design, 334, 66 - 74, 英語[査読有り]研究論文（学術雑誌）
- 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., 2018年06月, Experimental Thermal and Fluid Science, 94, 49 - 58, 英語[査読有り]研究論文（学術雑誌）
- 2018年04月, 9th European-Japanese Two-Phase Flow Group Meeting, 英語Two-phase flow and heat transfer characteristics in horizontal tube bundles[査読有り]研究論文（国際会議プロシーディングス）
- 2018年03月, 10th International Conference on Boiling and Condensation Heat Transfer, 英語Pool boiling heat transfer around a horizontal low thermal conductivity tube under isothermal wall condition[査読有り]研究論文（国際会議プロシーディングス）
- Japan Society of Mechanical Engineers, 2018年, The Proceedings of the National Symposium on Power and Energy Systems, 2018.23(0) (0), D212 - D212研究論文（学術雑誌）
- 2017年12月, 10th International Symposium on Measurement Techniques for Multiphase Flow, 英語Development of an ultrasonic technique for measuring liquid-metal two-phase flow[査読有り]研究論文（国際会議プロシーディングス）
- 2017年10月, The Ninth JSME-KSME Thermal and Fluids Engineering Conference, 英語Pool Boiling Heat Transfer around a Horizontal Low Thermal Conductivity Tube with Thermal Spray Coating with Isothermal Heating[査読有り]研究論文（国際会議プロシーディングス）
- 2017年03月, Nuclear Engineering and Design, Vol.316, 38 - 45, 英語Investigation of temperature fluctuation phenomena in a stratified steam-water two-phase flow in a simulating pressurizer spray pipe of a pressurized water reactor[査読有り]研究論文（学術雑誌）
- 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年, PROCEEDINGS OF THE ASME POWER CONFERENCE JOINT WITH ICOPE-17, 2017, VOL 1, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 2016年09月, Proc. of 10th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, 英語Evaluation of measurement accuracy of a dealiasing method for use with ultrasonic pulsed Doppler[査読有り]研究論文（国際会議プロシーディングス）
- 2016年05月, Proc. of 9th International Conference on Multiphase Flow, #433, 英語Evaluation of void fraction around a tube in two-phase flow across horizontal tube bundle[査読有り]研究論文（国際会議プロシーディングス）
- In this work, CeO2 nanoparticles were synthesized hydrothermally with supercritical water using a tubular flow reactor with three different configurations and various flow rates of the feed solution and supercritical water, and the effects of the reactor configuration and the flow rates of the two streams on the size distributions of the synthesized nanoparticles were investigated. In addition, the flow and thermal fields in the reactors were calculated numerically under the experimental conditions using FLUENT software, where the numerical results for the flow and thermal fields were also verified by neutron radiography. Comparing the experimental results of nanoparticle synthesis with the numerical results, it was revealed that the size distributions of the synthesized nanoparticles could be explained well on the basis of the flow patterns and temperature distributions in the reactor, which depended on the reactor configuration and process conditions. (C) 2015 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE BV, 2016年03月, JOURNAL OF SUPERCRITICAL FLUIDS, 109, 43 - 50, 英語[査読有り]研究論文（学術雑誌）
- 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, 2016年02月, MEASUREMENT SCIENCE AND TECHNOLOGY, 27(2) (2), 英語[査読有り]研究論文（学術雑誌）
- A new method for high flow rate measurement using ultrasonic multi-wave pulsed Doppler method with staggered triggerUltrasonic pulsed Doppler method is a powerful tool to measure velocity distribution in a flow field. However, the method has the maximum measurable velocity. In addition, the measurement volume of this method is relatively large and it is known that the measurement volume affects measured velocities in near-wall region. To measure higher velocity, feedback method which is a dealiasing method and a multi-wave ultrasonic transducer were introduced. Using the transducer, velocities in the near-wall region were measured by 8 MHz ultrasonic with small sensor diameter, velocities far from the transducer were measured by 2 MHz ultrasonic with large sensor diameter. Thus, measurement volume was minimized in the near-wall region. Experiments were carried out at flow rate calibration facility at AIST, and the effects of the measurement volume and the number of pulse repetitions for obtaining an instantaneous velocity profile, N_一般社団法人日本機械学会, 2015年11月, Proc. International Conference on Power Engineering-15 (ICOPE-15), 2015(12) (12), #ICOPE - 15-1040, 英語
, was discussed. As a result, reduction of the measurement volume improved measurement accuracy in the near-wall region by using the multi-wave transducer, and the measurement accuracy of flow rate was improved. Increasing the N_ was found to be effective for improving the measurement accuracy even though the total echo signals are the same for calculating the average velocity distribution. [査読有り]研究論文（国際会議プロシーディングス） - 2015年09月, 9th International Symposium on Measurement Techniques for Multiphase Flow (9thISMTMF), 197 - 198, 英語Visualization of water transport phenomenon in an operating PEFC in the through-plane direction[査読有り]研究論文（国際会議プロシーディングス）
- 2015年09月, 9th International Symposium on Measurement Techniques for Multiphase Flow (9thISMTMF), 93 - 94, 英語Measurement of void fraction distribution in two-phase flow across a horizontal tube bundle by using X-ray radiography and needle contact probes[査読有り]研究論文（国際会議プロシーディングス）
- The ultrasonic pulsed Doppler method (UDM) is a powerful tool for measuring velocity profiles in a pipe. However, the maximum detectable velocity is limited by the Nyquist sampling theorem. Furthermore, the maximum detectable velocity (also called Nyquist velocity), v(max), and the maximum measurable length are related and cannot be increased at the same time. If the velocity is greater than vmax, velocity aliasing occurs. Hence, the higher velocity that occurs with a larger pipe diameter, i.e. under higher flow rate conditions, cannot be measured with the conventional UDM. To overcome these limitations, dual-pulse repetition frequency (dual PRF) and feedback methods were employed in this study to measure velocity profiles in a pipe. The velocity distributions obtained with the feedback method were found to be more accurate than those obtained with the dual PRF method. However, misdetection of the Nyquist folding number using the feedback method was found to increase with the flow velocity. A feedback method with a moving average is proposed to improve the measurement accuracy. The method can accurately measure the velocity distributions at a velocity five times greater than the maximum velocity that can be measured with the conventional UDM. The measurement volume was found to be among the important parameters that must be considered in assessing the traceability of the reflector during the pulse emission interval. Hence, a larger measurement volume is required to measure higher velocities using the dual PRF method. Integrating velocity distributions measured using the feedback method with a moving average makes it possible to accurately determine flow rates six times greater than those that can be determined using the conventional pulsed Doppler method.IOP PUBLISHING LTD, 2015年08月, MEASUREMENT SCIENCE AND TECHNOLOGY, 26(8) (8), 英語[査読有り]研究論文（学術雑誌）
- 2015年07月, Journal of Flow Control, Measurement & Visualization, 3(3) (3), 122 - 133, 英語[査読有り]研究論文（学術雑誌）
- 2015年04月, Proc. of 9th International Symposium on Fluid Flow Measurement (ISFFM), 英語Development of a Dealiasing Method in Ultrasonic Pulsed Doppler Method for Flowrate Measurement[査読有り]研究論文（国際会議プロシーディングス）
- We have synthesized metal oxide nanoparticles through hydrothermal reaction at around 400 degrees C and 25 MPa by mixing the stream of metal ion solution at room temperature with another stream of supercritical water in a continuous flow-type reactor. In order to visualize the mixing behavior of the two streams, we performed neutron tomography measurements. By performing tomography measurements while rotating the mixing piece with supplying supercritical water and room temperature water, we succeeded in obtaining the three dimensional distribution of neutron attenuation. The results clearly showed how the two streams mix, which serves as a reference for numerical simulation. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.ELSEVIER SCIENCE BV, 2015年, PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10), 69, 564 - 569, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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年, Multiphase Science and Technology, 27(2-4) (2-4), 117 - 132, 英語[査読有り]研究論文（学術雑誌）
- The ultrasonic pulsed Doppler method can be applied to obtain instantaneous velocity distribution along the ultrasonic beam path. This technique has many advantages, and it has been applied for measuring flow rate. However, the method has limitation about the measurable velocity and length. In order to overcome the limitation, a dealiasing method using staggered trigger pulse was applied for measuring velocity profile in a pipe. Furthermore, a multi-wave ultrasonic transducer was proposed for the measurement for improving the velocity measurement accuracy in the near-wall region. The applicability was examined for measuring velocity profile in a pipe with inner diameter of 200 mm. The velocity distributions were accurately obtained over the pipe by combining the velocity distributions at the basic frequency of 8 MHz for the near-wall region and 2 MHz for the region far from the transducer. As a result, it was confirmed that the flow rate measurement was improved by using the multi-wave method.American Society of Mechanical Engineers, 2015年, ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015, 2A, #2015 - 10137, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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年, PROCEEDINGS OF THE 10TH WORLD CONFERENCE ON NEUTRON RADIOGRAPHY (WCNR-10), 69, 607 - 611, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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年, ICOPE 2015 - International Conference on Power Engineering, #ICOPE - 15-1040, 英語[査読有り]研究論文（国際会議プロシーディングス）
- The ultrasonic pulsed Doppler technique known as the ultrasonic velocity profile (UVP) method has been widely used in many engineering fields. The analysis algorithms of the UVP, the number of pulse repetitions (N-pulse), noise and reflector conditions, etc. all affect the measurement accuracy. N-pulse is related to the temporal resolution, thus to improve this resolution it must be set as low as possible. However, it is known that the measurement accuracy of the instantaneous velocity becomes worse with decreasing values of N-pulse. In this study, UVP analysis algorithms including the fast Fourier transform (FFT), autocorrelation, and the wavelet transform (WT) were compared via simulations and experiments using varying values of Npulse and the signal-to-noise ratio (SNR). We show that there is an appropriate N-pulse for each algorithm that depends on the SNR; specifically, the value of N-pulse increases with decreasing SNR. The difference between the algorithms for the velocity data was small under low noise conditions. However, a FFT with a Gaussian interpolation produced the best result under noisy conditions. In contrast the WT was relatively unaffected by noise. Therefore, a WT is the preferred choice for measuring velocity distributions if high sampling measurement is not required. (C) 2014 Elsevier Ltd. All rights reserved.ELSEVIER SCI LTD, 2014年12月, FLOW MEASUREMENT AND INSTRUMENTATION, 40, 9 - 18, 英語[査読有り]研究論文（学術雑誌）
- 2014年08月, Proc. of the 9th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, 117 - 120, 英語Improvement in Measurement Volume in Near-wall Region Using Ultrasonic Multi-wave Pulsed Doppler Method for Flowrate Measurement[査読有り]研究論文（国際会議プロシーディングス）
- 2014年08月, Proc. of the 9th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, 113 - 116, 英語Higher Flowrate Measurement using Ultrasonic Pulsed Doppler Method with Staggered Trigger[査読有り]研究論文（国際会議プロシーディングス）
- WILEY-BLACKWELL, 2014年03月, AICHE JOURNAL, 60(3) (3), 1168 - 1175, 英語[査読有り]研究論文（学術雑誌）
- Japan Society of Mechanical Engineers, 2014年, Transactions of the JSME (in Japanese), 80(819) (819), FE0319 - FE0319研究論文（学術雑誌）
- Japan Society of Mechanical Engineers, 2014年, Transactions of the JSME (in Japanese), 80(817) (817), FE0255 - FE0255[査読有り]研究論文（学術雑誌）
- 2014年, Peoc. of the 15th International Heat Transfer Conference, Paper No. IHTC15 - 9176, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 日本機械学会, 2014年, 日本機械学会論文集, 80(810) (810), FE0026 - FE0026, 日本語[査読有り]研究論文（学術雑誌）
- 2013年05月, Proc. of 8th Int. Conf. on Multiphase Flow (ICMF 2013), 英語Measurement of water distribution and analysis of gas-velocity distribution in an operating PEFC[査読有り]研究論文（国際会議プロシーディングス）
- 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, 2013年04月, 日本伝熱学会論文集, 21(2) (2), 59 - 66, 日本語[査読有り]研究論文（学術雑誌）
- Supercritical water is used in various chemical reaction processes including hydrothermal synthesis of metal oxide nano-particles, oxidation, chemical conversion of biomass and plastics. Density of the super critical water is much less than that of the sub-critical water. By using neutron radiography, Peterson et al. have studied salt precipitation processes in supercritical water and the flow pattern in a reverse-flow vessel for salt precipitation, and Balasko et al. have revealed the behaviour of supercritical water in a container. The nano-particles were made by mixing the super critical flow and the sub critical water solution. In the present study, neutron radiography was applied to the flow visualization of the super and sub critical water mixture in a T-junction made of stainless steel pipes for high pressure and temperature conditions to investigate their mixing process. Still images by a CCD camera were obtained by using the neutron radiography system at B4 port in KUR. (C) 2013 The Authors. Published by Elsevier B.V.ELSEVIER SCIENCE BV, 2013年, 7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7), 43, 264 - 268, 英語[査読有り]研究論文（国際会議プロシーディングス）
- Ultrasonic pulse Doppler method has been widely used in many engineering field referred to as UVP (ultrasonic velocity profiler). Analysis algorithm in the UVP, number of pulse repetition (Npulse), noise and reflector conditions, etc. may affect on the measurement accuracy. The Npulse is related to the temporal resolution, and must be set as low as possible in order to improve the temporal resolution. However, it is known that accuracy of instantaneous velocity becomes worse with decreasing of the Npulse. In this study, effect of analysis algorithm in the UVP on velocity data was investigated with changing of the Npulse and SNR by simulation and experiments. As a result, it is shown that there is an appropriate N pulse in each algorithm depending on the SNR. An algorithm which decides the Doppler frequency from maximum value in the power spectrum, FFT-max, was relatively hard to be affected by noise. Difference of velocity standard deviation was small between lower and higher noise conditions when FFT-max with Npulse over the appropriate value was used for the calculation. Hence, FFT-max was the best analysis algorithm for measuring flow field compared with the autocorrelation. ©2013 The Japan Society of Mechanical Engineers.日本機械学会, 2013年, 日本機械学会論文集B編, 79(799) (799), 356 - 367, 日本語[査読有り]研究論文（学術雑誌）
- 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年, 7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7), 43, 277 - 281, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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年, 7TH INTERNATIONAL TOPICAL MEETING ON NEUTRON RADIOGRAPHY (ITMNR-7), 43, 288 - 293, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 2012年09月, Proc. of 8th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, 105 - 108, 英語Effects of analysis algorithms and number of repetition pulses on velocity data by using ultrasonic Doppler method[査読有り]研究論文（国際会議プロシーディングス）
- 2012年06月, Proc. of 7th Int. Topical Meeting on Neutron Radiography (ITMNR-7), 58, 英語Visualization of water behavior in in-plane and through-plane directions of a PEFC using a color image intensifier[査読有り]研究論文（国際会議プロシーディングス）
- 2012年06月, Proc. of 7th Int. Topical Meeting on Neutron Radiography (ITMNR-7), 39, 英語Measurements of water distributions in the through-plane direction of a PEFC using a neutron color image intensifier[査読有り]研究論文（国際会議プロシーディングス）
- Neutrons are effectively scattered by hydrogen atoms and have high permeability in heavier elements including Fe, Cr, and Ni. Therefore, neutron radiography should enable the detection of differences in water density in a stainless-steel reactor. To test this, we performed neutron radiography on a tubular flow reactor for supercritical hydrothermal synthesis and visualized the mixing behavior of supercritical water and room-temperature water at a T-junction. The results showed that the difference in density between supercritical water and room-temperature water, as well as how the density changed during mixing, was clearly visualized. The partitioned flow in the side tube was also visualized while feeding room-temperature water. The results indicated the importance of buoyancy forces, as discussed by others in previous reports. (C) 2012 Published by Elsevier B.V.ELSEVIER SCIENCE BV, 2012年03月, JOURNAL OF SUPERCRITICAL FLUIDS, 63, 46 - 51, 英語[査読有り]研究論文（学術雑誌）
- 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年, PROCEEDINGS OF THE ASME POWER CONFERENCE - 2011, VOL 2, #POWER2011-55381, 427 - +, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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, 2011年09月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 277 - 281, 英語[査読有り]研究論文（学術雑誌）
- 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, 2011年09月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 286 - 289, 英語[査読有り]研究論文（学術雑誌）
- 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, 2011年09月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 290 - 296, 英語[査読有り]研究論文（学術雑誌）
- 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, 2011年09月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 268 - 272, 英語[査読有り]研究論文（学術雑誌）
- 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, 2011年09月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 651(1) (1), 264 - 267, 英語[査読有り]研究論文（学術雑誌）
- 2011年08月, Proc. of Int. Conf. on Advanced Technology in Experimental Mechanics 2011 (ATEM’11), pp.288, 英語Quantitative Measurements of Water Distribution in a PEFC by using Neutron Radiography and Analysis of Gas-velocity Distributions[査読有り]研究論文（学術雑誌）
- An ultrasonic velocity profile (UVP) method can measure instantaneous one-dimensional velocity profile along the measuring line. It is non-intrusive technique, and it can be easily applied for existing facilities. The UVP method utilizes the ultrasonic Doppler frequency reflected on tracer particles for obtaining the velocity. For analyzing the Doppler frequency, there are some algorithms such as Fast Fourier Transform (FFT), auto-correlation, and so on. However, the influence of the algorithms on measuring velocity profile has not been investigated. In this study, difference of the algorithms for velocity measurements was investigated using a developed system. It consists of an ultrasonic pulser-receiver which transmits and receives ultrasonic waves, a high-speed digitizer which records wave data, and a PC which analyzes and calculates velocity. FFT and auto-correlation method were used for the calculation. In case of the FFT, there are 2 methods to calculate the Doppler frequency. One is a method to calculate the frequency of maximum value in the power spectral density (PSD), and the other is a method to calculate the average value of the frequency in the PSD. Velocity distributions were compared to a laser Doppler velocimeter (LDV), and the appropriate algorithms were chosen depending on the flow conditions. From the results, it was clarified that the auto-correlation method could reduce the number of ultrasonic repetition for the measurement. Copyright © 2011 by ASME.2011年, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, 1(D) (D), 2773 - 2780, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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年, 日本機械学会論文集B編, 77(784) (784), 2255 - 2262, 日本語[査読有り]研究論文（学術雑誌）
- 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.一般社団法人 日本機械学会, 2010年06月, 日本機械学会論文集(B編), 76巻, 766号, pp.975-982(766) (766), 975 - 982, 日本語[査読有り]研究論文（学術雑誌）
- 2010年06月, Proc. of 7th International Conference on Multiphase Flow, #2.6.1, 英語Measurement of Water Thickness by using Neutron Radiography and Simulation of Gas-Velocity Distribution in a PEFC[査読有り]研究論文（学術雑誌）
- 2010年06月, Proc. of 7th International Conference on Multiphase Flow, #3.3.4, 英語Flow visualization of refrigerant behaviors in a self-vibration heat pipe[査読有り]研究論文（学術雑誌）
- 2010年04月, Proc. of 7th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, pp.71-74, 英語Identification of liquid-gas interface based on ultrasonic reflected signal for two-phase flow velocity measurement[査読有り]研究論文（学術雑誌）
- 2010年, KURRI Progress Report, 113 - 113, 英語Studies 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年, Multiphase Science and Technology, 22(1) (1), 57 - 78, 英語[査読有り]研究論文（学術雑誌）
- 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, 2009年08月, 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, 英語[査読有り]研究論文（学術雑誌）
- 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, 2009年06月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 204 - 207, 英語[査読有り]研究論文（学術雑誌）
- 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, 2009年06月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 131 - 133, 英語[査読有り]研究論文（学術雑誌）
- 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, 2009年06月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 142 - 145, 英語[査読有り]研究論文（学術雑誌）
- 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, 2009年06月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 200 - 203, 英語[査読有り]研究論文（学術雑誌）
- 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, 2009年06月, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 605(1-2) (1-2), 127 - 130, 英語[査読有り]研究論文（学術雑誌）
- 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年, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON POWER ENGINEERING 2009 (ICOPE-09), VOL 2, 2, pp.225-230, 225 - 230, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 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, 2008年06月, 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, 英語[査読有り]研究論文（学術雑誌）
- 2008年05月, 日本機械学会論文集(B編), 74巻, 741号, pp.1107-1113, 日本語細管内気液二相流のボイド率特性[査読有り]研究論文（学術雑誌）
- Visualization of a Self-Vibration Heat Pipe by Neutron RadiographyHeat 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 phenomena of the working fluid in the heat pipe. The working fluid in the pipe was visualized by the neutron radiography system in Japan Atomic Energy Agency. The liquid columns in the meandering channel of the heat pipe were visualized by a high speed camera. It was visualized and heat was transported. The obtained images were segmentated 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 0.25 similar to 0.5 second. The oscillation of the columns was analyzed as a mass-spring model. The periods and the phase speed of the oscillation were obtained and compared with the experiment results. It was showed that the analytical values agreeded with fairly the experimental values.DESTECH PUBLICATIONS, INC, 2008年, NEUTRON RADIOGRAPHY, pp.509-516, 509 - +, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 2007年08月, Proc. of the 18th International Symposium on Transport Phenomena, on CD-Rom, 英語Visualization of Two-Phase Flow Phenomena in a Self-Vibration Heat Pipe by Neutron Radiography[査読有り]研究論文（学術雑誌）
- 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年, CHALLENGES OF POWER ENGINEERING AND ENVIRONMENT, VOLS 1 AND 2, pp. 455-461, 455 - 461, 英語[査読有り]研究論文（国際会議プロシーディングス）
- An appraisal method of exergy cost minimisation for co-generation systemsThis study introduces an exergy cost-minimisation appraisal method for a simple gas turbine co-generation system. Optimisation of a gas turbine co-generation system of the electric output class of 17 MW is examined for a variety of turbine inlet temperatures of 950-1,300 degrees C. An optimum value of the turbine inlet temperature exists for exergy cost minimisation and is estimated to be 1,200 degrees C since the manufacturing price of the gas turbine increases greatly above 1,300 degrees C. This fact shows that the rising manufacturing cost of the gas turbine constitutes an important effect for future development of higher temperature systems.INDERSCIENCE ENTERPRISES LTD, 2006年, INTERNATIONAL JOURNAL OF EXERGY, 3(3) (3), 255 - 271, 英語[査読有り]研究論文（学術雑誌）
- 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.2005年12月, Heat Transfer - Asian Research, 34(8) (8), 564 - 578, 英語[査読有り]研究論文（学術雑誌）
- 2005年03月, 日本機械学会論文集B編, 71・703・908-913, 日本語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[査読有り]研究論文（学術雑誌）
- 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年, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 71(703) (703), 908 - 913, 日本語[査読有り]研究論文（学術雑誌）
- Factors such as low capital cost, good match of power and heat requirements and proven reliability can sometimes lead an end user into purchasing gas turbines for use in a modern cogeneration plant. The steam-injected gas turbine is an attractive electrical generating technology for mitigating the impacts of rising energy prices. According to such mentioned above this paper is to provide results of an optimization study on cogeneration power cycle, which works by gas turbine with recuperator and injection steam added to the combustor of the gas turbine. The performance characteristics of the cycle based on energy and exergy concepts and based upon practical performance constraints were investigated. The effect of the recuperator on the cycle was greatly clarified. Results also show that the output power of a gas turbine increases when steam is injected. When extra steam has to be generated in order to be able to inject steam and at the same time to provide for a given heat demand, power generating efficiency increases but cogeneration efficiency decreases with the increasing of injected steam. © 2004 John Wiley & Sons, Ltd.2004年10月, International Journal of Energy Research, 28(13) (13), 1127 - 1144, 英語[査読有り]研究論文（学術雑誌）
- 2004年02月, 日本機械学会論文集B編, 70・690・425-431, 日本語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[査読有り]研究論文（学術雑誌）
- 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年, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 70(699) (699), 2928 - 2934, 日本語[査読有り]研究論文（学術雑誌）
- 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年, Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 70(690) (690), 425 - 431, 日本語[査読有り]研究論文（学術雑誌）
- 神戸大学, 2004年, 神戸大学大学院自然科学研究科紀要, 22-B,59-66, 59 - 66, 日本語分岐管における気液二相流の流動特性に関する研究[査読有り]研究論文（学術雑誌）
- 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.一般社団法人日本機械学会, 2004年, 日本機械学会論文集（Ｂ編）, 70(699),2928-2934(699) (699), 2928 - 2934, 日本語[査読有り]研究論文（学術雑誌）
- 神戸大学, 2004年, Memoirs of Graduate School of Scinece and Technology Kobe University., 22-A,123-142, 123 - 142, 英語HAT and MAT Cycle for Power Augmentation of Gas Turbine Power Plants.[査読有り]研究論文（学術雑誌）
- 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年, International Journal of Exergy, 1(1) (1), 29 - 46, 英語[査読有り]研究論文（学術雑誌）
- 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, 2003年05月, JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, 46(2) (2), 262 - 269, 英語[査読有り]研究論文（学術雑誌）
- 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年03月, The 6th ASME*3-JSME*1 Thermal Engineering Joint Conference, 2003(6) (6), 158 - 158, 英語[査読有り]研究論文（学術雑誌）
- 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年03月, Proceedings of the 6th ASME-JSME Thermal Engineering Joint Conference on CD-Rom, B4-180(6) (6), 157 - 157, 英語[査読有り]研究論文（国際会議プロシーディングス）
- 2003年, Proceedings of the 1st International Exergy, Energy and Environment Symposium., 89, 英語New Rankine Cycle for Hydrogen-Fired Power Generation Plants.[査読有り]研究論文（国際会議プロシーディングス）
- A Study of Renewable Energy Hydrogen-Fired Power Generaion Plants.The world's population is expected to increase to ten billion in the 21^一般社団法人日本機械学会, 2003年, Proceedings of the International Conference on Power Engineering(ICOPE-03), 3,223-228(3) (3), "3 - 223"-"3-228", 英語
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. [査読有り]研究論文（国際会議プロシーディングス） - 2003年, 日本機械学会論文集（Ｂ編）, 69(677),100-106, 日本語潜熱利用二相流体排熱システムループの動特性実験研究論文（学術雑誌）
- 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年, Proc. of the 8th ASME-JSME Thermal Engineering Joint Conference on CD-Rom, B4-191(6) (6), 158 - 158, 英語研究論文（国際会議プロシーディングス）
- 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年, Proc. of the 6th ASME-JSME Thermal Engineering Joint Conference on CD-Rom, B4-180(6) (6), 157 - 157, 英語研究論文（国際会議プロシーディングス）
- 2003年01月, 日本機械学会論文集B編, 69・677・100-106, 69 - 677, 日本語潜熱利用二相流体排熱システムループの動特性実験[査読有り]研究論文（学術雑誌）
- 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.一般社団法人日本機械学会, 2002年08月, 日本機械学会論文集B編, 68・672・79-84(672) (672), 2247 - 2252, 日本語[査読有り]研究論文（学術雑誌）
- 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.一般社団法人日本機械学会, 2002年, 年次大会講演論文集, 2002, 207 - 208, 日本語
- 2001年10月, Proceedings of CSPE-JSME-ASME International Conference on Power Engineering, 2・1527-1533, 英語The Comparison of the Performance Characteristics of the Two-Fluid Cycle with the Conventional Cycle in Municipal Solid Waste-Burned Power Generation[査読有り]研究論文（学術雑誌）
- 2001年10月, Proceedings of CSPE-JSME-ASME International Conference on Power Engineering, 1・137-144, 英語An Analysis Based on Exergy Concept for JANDAR Combined Cycle Power Station[査読有り]研究論文（学術雑誌）
- Hydrogen, which does not generate CO_2 by combustion, is considered to be an important (clean) energy source in near future. In the middle of 21st century, hydrogen energy society may be realized. In this study, several distributed hydrogen energy systems, which use hydrogen produced by water electrolysis, are dealt, and the energy costs for each system are evaluated. As a result, the energy cost using Brown's gas is greater than that of using the town gas in the case of present cost of equipment. However, in the case of 50% of the cost of equipment and cost of town gas of 100 yen/m^3, the case of Brown's gas is nearly equal to the case using town gas.一般社団法人日本機械学会, 2001年, 熱工学講演会講演論文集, 2001, 209 - 210, 日本語
- 2001年, Proc. of the 23rd International Symposium on Space Technology and Science, pp.1656-1661., 英語Two-Phase Flow Behaviors in Adiabatic Horizontal Pipe under Microgravity[査読有り]研究論文（国際会議プロシーディングス）
- 2001年, Proc. of the Microgravity Transport Processes in Fluid, Thermal, Biological and Materials Sciences II, pp. 290-294., 英語A Study of Gas-Liquid Two-Phase Flow in a Horizontal Tube under Microgravity[査読有り]研究論文（国際会議プロシーディングス）
- 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, 2000年10月, Proc. 4th JSME-KSME Thermal Engineering Conference, 1・7-11, "1 - 7"-"1-11", 英語[査読有り]研究論文（学術雑誌）
- 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, C_5H_12, C_6H_6, and H_2O at the bottoming cycle. The performance characteristics of the two-fluid cycle are obtained at topping steam temperatures of 395 and 495℃. 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 C_6H_6 as the working fluid under the main steam temperature of 395℃ by superheating the bottoming vapor.一般社団法人日本機械学会, 2000年06月, 日本機械学会論文集Ｂ編, 66・646・349-354(646) (646), 1607 - 1612, 日本語[査読有り]研究論文（学術雑誌）
- 2000年04月, Proc. 8th International Conference on Nuclear Engineering ICONE-8, 英語An Application of the Two-Fluid Cycle to the Nuclear Power Plant[査読有り]研究論文（学術雑誌）
- 一般社団法人日本機械学会, 2000年, 年次大会資料集, 2000, 165 - 166, 日本語
- 2000年01月, Proceedings of Symposium on Energy Engineering in the 21st Century, 1438-1445, 英語Performance Evaluation of the Two-Fluid Cycle in Municipal Solid Waste-Burnt Power Generation[査読有り]研究論文（学術雑誌）
- 1999年10月, Proceedings of International Joint Power Generation Conference of Power Engineering, 2・257-264, 英語Performance Characteristics of the Two-Fluid Cycle in Municipal Solid Waste Burned Power Generation[査読有り]研究論文（学術雑誌）
- 1999年06月, 日本機械学会論文集B編, 65・634・278-283, 日本語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[査読有り]研究論文（学術雑誌）
- 神戸大学, 1998年11月, Memoirs of the Faculty of Engineering, Kobe University, 45・63-72, 63 - 72, 英語Performance Characteristics of the Two-Fluid Cycle in Municipal Solid Waste-Burnt Power Generation[査読有り]研究論文（学術雑誌）
- 2018年, 石油・石油化学討論会講演要旨, 48th充填層型反応器内の重質油流動挙動の中性子ラジオグラフィによるin situ観察
- 日本冷凍空調学会, 2017年, 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, 日本語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
- 一般社団法人日本機械学会, 2016年03月11日, 関西支部講演会講演論文集, 2016(91) (91), 405 - 405, 日本語P031 地熱発電所用復水器における水噴霧特性に関する研究(メカボケーション学生研究発表セッション)
- 一般社団法人日本機械学会, 2016年03月11日, 関西支部講演会講演論文集, 2016(91) (91), 344 - 344, 日本語M810 水平ダクト内気液二相流における気泡通過時の壁面せん断応力変化に関する研究(GS5 流体工学(3),修士研究発表セッション)
- 2016年, KURRI-EKR (Web), (1) (1)X線ラジオグラフィによる水平バンドル内気液二相流のボイド率分布計測
- 0402 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Ultrasonic 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_一般社団法人日本機械学会, 2015年11月07日, 流体工学部門講演会講演論文集, 2015, "0402 - 1"-"0402-2", 日本語
, and the measured velocity was investigated. It was found that if measured velocities were higher than the ν_ , the velocity accuracy dramatically decreased. Further, the tendency was more apparent with going away from the transducer. - 1701 水平バンドル内気液二相流の管周り局所ボイド率評価Measurements of void fraction distribution around tubes across horizontal tube bundle in liquid-gas two-phase flow were carried out using X-ray radiography system. Under bubbly flow condition, it was observed that bubbles mainly passed through the vertical tube gaps and accumulated on the upstream side of the tubes. Also it was observed that void fraction was lower around the wall side tubes than that the center tubes. Measurements results of the void fraction were underestimated comparing to the previous studies. Because void fraction near the wall is lower than that in the center-region. Thus, cross-sectional averaged void fraction decreased comparing to the void fraction which was averaged except for the near-wall region.一般社団法人日本機械学会, 2015年11月07日, 流体工学部門講演会講演論文集, 2015, "1701 - 1"-"1701-2", 日本語
- H222 自励振動型ヒートパイプの熱輸送特性に関する研究(一般講演(12))This 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.一般社団法人日本機械学会, 2015年10月23日, 熱工学コンファレンス講演論文集, 2015, "H222 - 1"-"H222-2", 日本語
- F112 マルチウェイブ超音波パルスドップラ法による高流量計測手法の開発(OS9 熱・流動(1))As ultrasonic pulsed Doppler has many advantages, it has been widely used for measuring velocity profiles. By integrating the obtained velocity profile all over the pipe, flow rate can be derived. The authors have developed feedback method which is a dealiasing method for high flow rate measurement and reported that measurement accuracy was improved by applying a multi-wave ultrasonic transducer. In this paper, effect of the size of measurement volume was investigated analytically and experimentally. In the analysis, measured velocities were considered to be ensemble average over the measurement volume. Analytical results showed the effect of channel-width was more significant than that of the sensor diameter. Furthermore, results of experiments were in good agreement with the analysis.一般社団法人日本機械学会, 2015年06月07日, 動力・エネルギー技術の最前線講演論文集 : シンポジウム, 2015(20) (20), 141 - 142, 日本語
- A232 下向き閉塞分岐配管に生じる流動現象に関する研究 : 侵入深さの変動メカニズム(OS2 保全・設備診断技術(5))Hot water in a main pipe flows into a branch pipe and forms a thermally stratified layer with cold water at a bent section. Fluctuation of the thermally stratified layer may initiates thermal fatigue crack in the branch pipe. It has been reported that the fluctuation of penetration depth induced by the main flow in the branch pipe with a closed end was caused by generation of a large swirl flow at L = 4D_b. Experiments with the rectangular and reduced branch pipes were conducted to suppress the fluctuation of penetration depth induced by the main flow. It was shown that the fluctuation of penetration depth in the rectangular pipe was suppressed, because the large swirl flow at L = 4D_b was not formed. It was also shown that the rectangular and reduced branch pipes were available to decrease the penetration depth by the main flow in the branch pipe.一般社団法人日本機械学会, 2015年06月07日, 動力・エネルギー技術の最前線講演論文集 : シンポジウム, 2015(20) (20), 201 - 204, 日本語
- A231 加圧水型原子炉の加圧器スプレー配管における温度変動現象に及ぼす非凝縮性ガスの影響(OS2 保全・設備診断技術(5))Steam-water two phase flow is present in normal operating condition in the horizontal part of the pressurizer spray pipe of PWR. High cycle fatigue crack generation is a concern under the conditions of such thermally laminar two phase flow, wherein temperature fluctuation under of steam-water interface is caused by internal gravity waves in thermal stratified flow. In this study the effect of non-condensable gas to the temperature fluctuation of thermal stratified flow was investigated by the experiments using visualization test section of rectangular pipe. As a result, temperature distribution and fluctuation were roughly divided into three patterns by the amount of the non-condensable gas.一般社団法人日本機械学会, 2015年06月07日, 動力・エネルギー技術の最前線講演論文集 : シンポジウム, 2015(20) (20), 197 - 200, 日本語
- A222 大型ガスタービンの高温部品の信頼性評価手法について(OS2 保全・設備診断技術(4))This paper describes an improvement of a method applied for evaluating reliability of hot gas path parts of large industrial gas turbine based on the field experiences obtained from long term commercial operations. The results of statistical analysis using the information provide better knowledge about gaps between design analysis, development tests, verification, and actual conditions after long term use. The knowledge shall be feedback to continuous activities to establish efficient corrective actions for reliability enhancement. Required improvement points for current method are summarized and Bayesian estimation is evaluated as a countermeasure and confirmed to be effective for improvements.一般社団法人日本機械学会, 2015年06月07日, 動力・エネルギー技術の最前線講演論文集 : シンポジウム, 2015(20) (20), 191 - 194, 日本語
- 2014年, 日本伝熱シンポジウム講演論文集(CD-ROM), 51st流通式超臨界水熱合成反応器内の熱流動場と生成ナノ粒子の粒径分布との相関
- 2014年, 結晶成長国内会議予稿集(CD-ROM), 44th超臨界水熱法によるナノ粒子合成プロセスにおける熱流動場の可視化と解析-中性子ラジオグラフィと数値シミュレーションを利用して-
- 可視化情報学会, 2014年, 可視化情報学会誌 = ournal of the Visualization Society of Japan, 34(1) (1), 85 - 88, 日本語超音波パルスドップラ法における壁面近傍での測定体積による計測精度への影響
- 可視化情報学会, 2014年, 可視化情報学会誌 = ournal of the Visualization Society of Japan, 34(1) (1), 81 - 84, 日本語超音波パルスドップラ法の速度限界の拡張と高流量計測への適用
- 2013年, セラミックス基礎科学討論会講演要旨集, 51st流通式ナノ粒子合成装置における管内流動状態の中性子線ラジオグラフィー観察
- 2013年, 化学工学会年会研究発表講演要旨集(CD-ROM), 78th超臨界水熱合成反応器内の流動,水密度及び温度分布の数値シミュレーション
- 2013年, 日本伝熱シンポジウム講演論文集(CD-ROM), 50th中性子ラジオグラフィによる超臨界水熱合成反応器内の混合状態に及ぼす反応器幾何学形状の影響の検討
- 2013年, 化学工学会年会研究発表講演要旨集(CD-ROM), 78th中性子線CTを用いた流通式超臨界水熱合成装置内での混合状態のin situ観察
- 2012年, 化学工学会年会研究発表講演要旨集(CD-ROM), 77th中性子線ラジオグラフィーを用いた流通式超臨界水熱合成装置における混合部近傍の可視化
- 2012年, 日本伝熱シンポジウム講演論文集(CD-ROM), 49th中性子ラジオグラフィ及び数値シミュレーションによる超臨界水熱合成反応器内の混合状態の可視化
- 可視化情報学会, 2012年, 可視化情報学会誌 = ournal of the Visualization Society of Japan, 32(1) (1), 245 - 248, 日本語ウェーブレット解析を用いた超音波ドップラ法の信号処理の検討 (第40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 超音波を用いた流体計測)
- 2011年, 日本伝熱シンポジウム講演論文集(CD-ROM), 48th中性子ラジオグラフィによる超臨界水熱合成反応器内の流動・混合状態のその場観察
- 2011年, 化学工学会秋季大会研究発表講演要旨集(CD-ROM), 43rd中性子線を用いた流通式超臨界水熱合成装置における管内混合・流動状態のその場観察
- 2011年, 日本混相流学会年会講演会講演論文集, 2011中性子ラジオグラフィによる超臨界水・亜臨界水混合状態の可視化
- D202 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(OS4 水素・燃料電池),動力エネルギーシステム部門20周年,次の20年への新展開)Fuel 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.一般社団法人日本機械学会, 2010年06月20日, 動力・エネルギー技術の最前線講演論文集 : シンポジウム, 2010(15) (15), 381 - 384, 日本語
- 日本非破壊検査協会, 2010年03月01日, 非破壊検査 : journal of N.D.I, 59(3) (3), 106 - 109, 日本語中性子ダイナミックCTシステムの開発
- 日本混相流学会, 2009年12月15日, 混相流 = Japanese journal of multiphase flow, 23(4) (4), 447 - 450, 日本語神戸大学大学院工学研究科機械工学専攻・混相熱流体工学研究室
- G143 界面活性剤溶液による摩擦損失低減効果中における熱伝達特性に関する研究(対流伝熱促進・制御IV)The drag reduction by using surfactant is expected to contribute for saving energy in heat exchangers. Measurements of pressure drop and heat transfer were conducted to investigate the heat transfer characteristics of the drag reduction with changing the mole ratio ξ and the concentration of the solution. The drag reduction effect was obserbed under the conditions of over 300ppm of the solution at ξ =10. The pressure drop decreased with increasing of the surfactant concentration. Heat transfer coefficient decreased when the drag reduction occurred. Corburn analogy was applicable to the experimental results for low flow velocity conditions.一般社団法人日本機械学会, 2009年11月06日, 熱工学コンファレンス講演論文集, 2009, 201 - 202, 日本語
- D141 中性子ラジオグラフィによる固体高分子形燃料電池内の膜厚方向水分布の計測(多孔質中の熱・物質輸送現象II)This 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.一般社団法人日本機械学会, 2009年11月06日, 熱工学コンファレンス講演論文集, 2009, 111 - 112, 日本語
- 一般社団法人日本機械学会, 2009年03月16日, 関西支部講演会講演論文集, 2009(84) (84), "11 - 24", 日本語1124 加速器ターゲットにおける熱流動に関する研究(GS-6 伝熱流動(2))
- 日本混相流学会, 2007年12月15日, 混相流, 21(4) (4), 397 - 404, 日本語固体高分子形燃料電池における混相流 : 中性子ラジオグラフィによる可視化と計測
- OS5-3 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の可視化と計測(OS5 水素・燃料電池,循環型社会における動力エネルギー技術)Hydrogen 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.一般社団法人日本機械学会, 2007年06月13日, 動力・エネルギー技術の最前線講演論文集 : シンポジウム, 2007(12) (12), 255 - 258, 日本語
- B213 パラフィンエマルジョンの熱流動特性に関する研究(融解・凝固)This 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.一般社団法人日本機械学会, 2006年11月23日, 熱工学コンファレンス講演論文集, 2006, 259 - 260, 日本語
- E111 溶射加工を施したコールドプレートにおける急加熱時の沸騰伝熱特性(沸騰・凝縮)This 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.一般社団法人日本機械学会, 2006年11月23日, 熱工学コンファレンス講演論文集, 2006, 149 - 150, 日本語
- 一般社団法人日本機械学会, 2006年03月17日, 関西支部講演会講演論文集, 2006(81) (81), "7 - 7", 日本語707 垂直多分岐管内気液二相流の可視化とボイド率分布(GS-5 計測)
- 神戸大学, 2005年03月, 神戸大学大学院自然科学研究科紀要. B, 23, 21 - 26, 日本語エクセルギーコストの最小評価手法に関する研究
- 2005年, （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, 日本語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－[査読有り]その他
- 2005年, （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, 日本語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－[査読有り]その他
- 2005年, （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, 日本語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－[査読有り]その他
- 2005年, 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, 日本語潜熱蓄熱器の評価研究[査読有り]その他
- 2004年04月01日, KURRI Progress Report, 152
- 2004年, 日本伝熱シンポジウム講演論文集, 41st(Vol.1) (Vol.1)キャピラリーポンプループの性能特性に関する研究
- 2003年03月, 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, 日本語分散電源対応民生用熱供給システムの研究開発その他
- 807 還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The 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.一般社団法人日本機械学会, 2003年, 関西支部講演会講演論文集, 2003(78) (78), "8 - 13"-"8-14", 日本語
- 803 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A 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.一般社団法人日本機械学会, 2003年, 関西支部講演会講演論文集, 2003(78) (78), "8 - 5"-"8-6", 日本語
- 722 分岐管における空気混入及びオリフィスによる水撃現象への影響に関する研究The 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.一般社団法人日本機械学会, 2003年, 関西支部講演会講演論文集, 2003(78) (78), "7 - 43"-"7-44", 日本語
- 1415 T 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The 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.一般社団法人日本機械学会, 2003年, 関西支部講演会講演論文集, 2003(78) (78), "14 - 29"-"14-30", 日本語
- 809 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の開発A 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.一般社団法人日本機械学会, 2003年, 関西支部講演会講演論文集, 2003(78) (78), "8 - 17"-"8-18", 日本語
- TED-AJ03-169 A Clean Environment Gas Turbine Cogeneration plant :Factors such as low capital cost, good match of power and heat requirements, and proven reliability can sometimes lead an end user into purchasing gas turbines for use in a modern cogeneration plant. The steam-injected gas turbine is an attractive electrical generating technology for mitigating the impacts of rising energy prices. The technology greatly extends the range of cost-effective gas turbine cogeneration to include many applications that involve variable and unpredictable process steam load. The high efficiency of this technology makes it possible to produce electric power competitively and with low environmental impacts when fired with natural gas and relatively costly synthetic fuels. According to such mentioned above this paper is to provide results of an optimization study on cogeneration power cycle, which works by gas turbine with recuperator and injection steam added to the combustor of the gas turbine (referred to as the Cheng cycle). The performance characteristics of the cycle were investigated. The effect of the recuperator on the cycle was clarified.日本機械学会, 2003年, Proceedings of the ... ASME/JSME Thermal Engineering Joint Conference, 2003(6) (6), 114 - 114, 英語
- 2003年, (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, 日本語ハイブリッド式流体ループの流熱制御技術研究その他
- 神戸大学, 2002年03月, 神戸大学大学院自然科学研究科紀要. A, 20, 95 - 115, 英語Improvement of Performance Characteristics of Power Generation Cycles with Gas Turbines
- 1110 二相流体ループ式排熱システムの過渡応答特性It 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.一般社団法人日本機械学会, 2002年, 関西支部講演会講演論文集, 2002(77) (77), "11 - 19"-"11-20", 日本語
- 204 エクセルギーコストの最小化評価法に関する研究Recently, co-generation systems became to be used widespread. However, various kinds of factors such as operational conditions and operation & maintenance cost exist. In this study, the appraisal method of exergy cost minimization for a gas turbine co-generation system is introduced by evaluating the cost for the exergy loss. As the result, if the turbine inlet temperature is increasing, the cost concerning exergy irreversible loss is decreasing. However, the optimum value exists for the exergy cost. The optimum temperature was 1150℃ in the estimation of these values.一般社団法人日本機械学会, 2002年, 関西支部講演会講演論文集, 2002(77) (77), "2 - 15"-"2-16", 日本語
- 1998年, 日本機械学会関西学生会卒業研究発表講演会講演前刷集, 1998ループ型細管ヒートパイプの熱輸送特性に関する研究
- 共著, S&T出版, 2015年08月, 日本語, 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」学術書
- 共著, コロナ社, 2003年03月, 日本語コージェネレーションの基礎と応用学術書
- 第97期定時総会講演会, 2022年03月, 日本語磁場印加時の磁性ナノ流体における沸騰伝熱特性に関する研究口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語固体高分子形燃料電池内水分布と膜抵抗に及ぼすマイクロポーラス層の影響に関する研究口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語水平管群沸騰熱伝達における核沸騰伝熱促進効果への管ピッチの影響に関する研究口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語水平三角形細管内の蒸発熱流動特性に関する研究口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語非円形細管内気液二相流に及ぼす力の支配領域線図の構築口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語湿り蒸気流を対象としたクランプオン式超音波流量計の受信波形に基づく流動様式評価口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語トモグラフィ法を用いたクランプオン式超音波流量計に関する研究口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語中性子ラジオグラフィによるミニチャネル直交型蒸発器内冷媒二相流の可視化とボイド率計測（不均一熱流束の影響）口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語ガリウム合金中を上昇する連続気泡の気泡挙動に及ぼす気泡生成頻度の影響に関する研究口頭発表（一般）
- 関西学生会2021年度学生員卒業研究発表講演会, 2022年03月, 日本語磁性ナノ流体中にノズルから注入された気泡の挙動に及ぼす磁場の影響に関する口頭発表（一般）
- 第99期流体工学部門講演会, 2021年11月, 日本語トモグラフィー法を用いた超音波流量計測における超音波伝搬解口頭発表（一般）
- 第99期流体工学部門講演会, 2021年11月, 日本語トモグラフィー法を用いたクランプオン型超音波流量計の開発口頭発表（一般）
- 2021年度日本冷凍空調学会年次大会, 2021年09月, 日本語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口頭発表（一般）
- 日本混相流シンポジウム2021, 2021年08月, 日本語超音波トモグラフィを用いたガリウム合金中を上昇する連続気泡の流動評価口頭発表（一般）
- 第25回動力・エネルギー技術シンポジウム2021, 2021年07月, 日本語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）口頭発表（一般）
- 第58回日本伝熱シンポジウム, 2021年05月, 日本語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口頭発表（一般）
- 第98期流体工学部門講演会, 2020年11月, 日本語トモグラフィ法を用いたクランプオン式超音波流量計の開発口頭発表（一般）
- 第98期流体工学部門講演会, 2020年11月, 日本語クランプオン式超音波流量計による湿り蒸気流量計測における計測誤差の検討口頭発表（一般）
- 第98期流体工学部門講演会, 2020年11月, 日本語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口頭発表（一般）
- 第98期流体工学部門講演会, 2020年11月, 日本語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口頭発表（一般）
- 第98期流体工学部門講演会, 2020年11月, 日本語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口頭発表（一般）
- 2020年度日本冷凍空調学会年次大会, 2020年09月, 日本語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口頭発表（一般）
- 日本機械学会第97期流体工学部門講演会, 2019年11月, 日本語クランプオン式超音波流量計測のための超音波透過波形の評価ポスター発表
- 混相流シンポジウム2019, 2019年08月, 日本語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口頭発表（一般）
- 第24回動力・エネルギー技術シンポジウム, 2019年06月, 日本語クランプオン式超音波流量計による湿り蒸気計測のための透過波形評価手法口頭発表（一般）
- 第24回動力・エネルギー技術シンポジウム, 2019年06月, 日本語水平管群内空気-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口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議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口頭発表（一般）
- 日本機械学会 関西支部第94期定時総会講演会, 2019年03月, 日本語, 日本機械学会 関西支部, 草津, 国内会議並列垂直管内沸騰二相流の流動特性に関する研究口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議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口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議水平管群周り空気 －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口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議水平管群の沸騰伝熱特性に関する研究口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議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口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議PEFC内部の水輸送現象が発電性能に与える影響の解明口頭発表（一般）
- 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, 2019年03月, 日本語, 日本機械学会 関西学生会, 草津, 国内会議Effect of flow path diameter on heat transfer performance of pulsating heat pipe口頭発表（一般）
- 第96期流体工学部門講演会, 2018年11月, 日本語, 日本機械学会流体工学部門, 室蘭, 国内会議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ポスター発表
- 第96期流体工学部門講演会, 2018年11月, 日本語, 日本機械学会流体工学部門, 室蘭, 国内会議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ポスター発表
- 2018年度日本冷凍空調学会年次大会, 2018年09月, 日本語, 日本冷凍空調学会, 郡山, 国内会議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口頭発表（一般）
- 2018年度日本冷凍空調学会年次大会, 2018年09月, 日本語, 日本冷凍空調学会, 郡山, 国内会議水平管群内沸騰熱伝達に関する研究口頭発表（一般）
- 2018年度日本冷凍空調学会年次大会, 2018年09月, 日本語, 日本冷凍空調学会, 郡山, 国内会議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口頭発表（一般）
- 11th World Conference on Neutron Radiography, 2018年09月, 英語, International Society for Neutron Radiography, Sydney, Australia, 国際会議Visualization and measurement of boiling flow behaviors in parallel mini-channel heat exchanger by neutron radiographyポスター発表
- 11th World Conference on Neutron Radiography, 2018年09月, 英語, International Society for Neutron Radiography, Sydney, Australia, 国際会議Simultaneous measurements of water distribution and electrochemical characteristics in polymer electrolyte fuel cellポスター発表
- 混相流シンポジウム2018, 2018年08月, 日本語, 日本混相流学会, 仙台, 国内会議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口頭発表（一般）
- 混相流シンポジウム2018, 2018年08月, 日本語, 日本混相流学会, 仙台, 国内会議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口頭発表（一般）
- 第23回動力・エネルギー技術シンポジウム, 2018年06月, 日本語, 日本機械学会動力・エネルギー部門, 宇部, 国内会議水平管群の沸騰熱流動に関する研究口頭発表（一般）
- 第23回動力・エネルギー技術シンポジウム, 2018年06月, 日本語, 日本機械学会動力・エネルギー部門, 宇部, 国内会議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口頭発表（一般）
- 第23回動力・エネルギー技術シンポジウム, 2018年06月, 日本語, 日本機械学会動力・エネルギー部門, 宇部, 国内会議T 字合流部に生じる熱疲労発生メカニズムの検討口頭発表（一般）
- 第55回日本伝熱シンポジウム, 2018年05月, 日本語, 日本伝熱学会, 札幌, 国内会議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口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議低沸点冷媒の膜沸騰遷移条件に関する研究口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議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口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議水平管群の沸騰熱流動に関する研究口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議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口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議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口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議ミニチャネル直交型蒸発器内の冷媒流れの可視化口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議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口頭発表（一般）
- 関西学生会2017年度学生員卒業研究発表講演会, 2018年03月, 日本語, 日本機械学会関西支部, 寝屋川, 国内会議T字配管合流部における噴流の揺動現象に関する研究口頭発表（一般）
- 可視化情報全国講演会 (室蘭2017), 2017年11月, 日本語, 可視化情報学会, 室蘭, 国内会議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口頭発表（一般）
- 可視化情報全国講演会 (室蘭2017), 2017年11月, 日本語, 可視化情報学会, 室蘭, 国内会議超音波を用いたT字合流部における噴流の可視化口頭発表（一般）
- 2017年度 日本冷凍空調学会 年次大会, 2017年09月, 日本語, 日本冷凍空調学会, 町田, 国内会議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－口頭発表（一般）
- 混相流シンポジウム2017, 2017年08月, 日本語, 日本混相流学会, 調布, 国内会議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口頭発表（一般）
- 第45回可視化情報シンポジウム, 2017年07月, 日本語, 可視化情報学会, 東京, 国内会議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口頭発表（一般）
- 第22回動力・エネルギー技術シンポジウム, 2017年06月, 日本語, 日本機械学会, 豊橋, 国内会議プラント配管のT字合流部の流動特性に関する研究口頭発表（一般）
- 第22回動力・エネルギー技術シンポジウム, 2017年06月, 日本語, 日本機械学会, 豊橋, 国内会議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口頭発表（一般）
- 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, 2017年03月, 日本語, 日本機械学会関西支部, 吹田, 国内会議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口頭発表（一般）
- 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, 2017年03月, 日本語, 日本機械学会関西支部, 吹田, 国内会議水平および垂直管内一成分系二相流の流動挙動に関する研究口頭発表（一般）
- 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, 2017年03月, 日本語, 日本機械学会関西支部, 吹田, 国内会議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口頭発表（一般）
- 日本機械学会関西支部第92期定時総会講演会, 2017年03月, 日本語, 日本機械学会関西支部, 吹田, 国内会議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口頭発表（一般）
- 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, 2017年03月, 日本語, 日本機械学会関西支部, 吹田, 国内会議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口頭発表（一般）
- 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, 2017年03月, 日本語, 日本機械学会関西支部, 吹田, 国内会議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口頭発表（一般）
- 第94期日本機械学会流体工学部門講演会, 2016年11月, 日本語, 日本機械学会, 宇部, 国内会議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口頭発表（一般）
- 2016年度日本冷凍空調学会年次大会, 2016年09月, 日本語, 日本冷凍空調学会, 神戸, 国内会議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口頭発表（一般）
- 日本混相流学会混相流シンポジウム2016, 2016年08月, 日本語, 日本混相流学会, 京都, 国内会議水平管群を横切る気液二相流の管群配列によるボイド率分布への影響口頭発表（一般）
- 日本混相流学会混相流シンポジウム2016, 2016年08月, 日本語, 日本混相流学会, 京都, 国内会議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口頭発表（一般）
- 第44回可視化情報シンポジウム, 2016年07月, 日本語, 可視化情報学会, 東京, 国内会議超音波パルスドップラ法における速度限界拡張手法の信頼性評価口頭発表（一般）
- 第53回日本伝熱シンポジウム, 2016年06月, 日本語, 日本伝熱学会, 大阪, 国内会議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口頭発表（一般）
- 第53回日本伝熱シンポジウム, 2016年06月, 日本語, 日本伝熱学会, 大阪, 国内会議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口頭発表（一般）
- 第21回動力・エネルギー技術シンポジウム, 2016年06月, 日本語, 日本機械学会, 横浜, 国内会議加圧水型原子炉の加圧器スプレー配管における温度変動現象に及ぼす非凝縮性ガスの影響口頭発表（一般）
- 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, 2016年03月, 日本語, 日本機械学会関西支部, 大阪, 国内会議Ｔ字合流部における流動現象に関する研究口頭発表（一般）
- 日本機械学会関西支部 第91期定時総会講演会, 2016年03月, 日本語, 日本機械学会関西支部, 大阪, 国内会議地熱発電所用復水器における水噴霧特性に関する研究ポスター発表
- 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, 2016年03月, 日本語, 日本機械学会関西支部, 大阪, 国内会議水平管群を横切る気液二相流に関する研究口頭発表（一般）
- 日本機械学会関西支部 第91期定時総会講演会, 2016年03月, 日本語, 日本機械学会関西支部, 大阪, 国内会議水平ダクト内気液二相流における気泡通過時の壁面せん断応力変化に関する研究口頭発表（一般）
- 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, 2016年03月, 日本語, 日本機械学会関西支部, 大阪, 国内会議固体高分子形燃料電池内の水輸送現象に関する研究口頭発表（一般）
- 第93期日本機械学会流体工学部門講演会, 2015年11月, 日本語, 日本機械学会, 東京, 国内会議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口頭発表（一般）
- 第93期日本機械学会流体工学部門講演会, 2015年11月, 日本語, 日本機械学会, 東京, 国内会議水平バンドル内気液二相流の管周り局所ボイド率評価口頭発表（一般）
- 熱工学コンファレンス2015, 2015年10月, 日本語, 日本機械学会, 大阪, 国内会議自励振動型ヒートパイプの熱輸送特性に関する研究口頭発表（一般）
- 7th European-Japanese Two-Phase Flow Group Meeting, 2015年10月, 英語, Zermatt, Switzerland, 国際会議Study on Water Transport Phenomena in Polymer Electrolyte Membrane Fuel Cell in the Through-Plane Direction口頭発表（一般）
- 第20回動力・エネルギー技術シンポジウム, 2015年06月, 日本語, 日本機械学会, 仙台, 国内会議大型ガスタービンの高温部品の信頼性評価手法について口頭発表（一般）
- 第52回日本伝熱シンポジウム, 2015年06月, 日本語, 日本伝熱学会, 福岡, 国内会議固体高分子形燃料電池における膜厚方向の水輸送現象口頭発表（一般）
- 第20回動力・エネルギー技術シンポジウム, 2015年06月, 日本語, 日本機械学会, 仙台, 国内会議加圧水型原子炉の加圧器スプレー配管における温度変動現象に及ぼす非凝縮性ガスの影響口頭発表（一般）
- 第20回動力・エネルギー技術シンポジウム, 2015年06月, 日本語, 日本機械学会, 仙台, 国内会議下向き閉塞分岐配管に生じる流動現象に関する研究（侵入深さの変動メカニズム）口頭発表（一般）
- 第20回動力・エネルギー技術シンポジウム, 2015年06月, 日本語, 日本機械学会, 仙台, 国内会議マルチウェイブ超音波パルスドップラ法による高流量計測手法の開発口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2015年03月, 日本語, 日本機械学会関西支部, 京都, 国内会議超音波パルスドップラ法における計測速度限界の拡張に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2015年03月, 日本語, 日本機械学会関西支部, 京都, 国内会議水平管群を横切る気液二相流のボイド率分布計測口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2015年03月, 日本語, 日本機械学会関西支部, 京都, 国内会議自励振動ヒートパイプの流動特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2015年03月, 日本語, 日本機械学会関西支部, 京都, 国内会議固体高分子型燃料電池内における水輸送に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2015年03月, 日本語, 日本機械学会関西支部, 京都, 国内会議逆環状流の熱伝達特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2015年03月, 日本語, 日本機械学会関西支部, 京都, 国内会議プラント内の分岐配管における流動現象に関する研究口頭発表（一般）
- 熱工学コンファレンス2014, 2014年11月, 日本語, 日本機械学会, 東京, 国内会議平板型サーモサイフォンの熱輸送特性の流路形状による影響口頭発表（一般）
- 第55回電池討論会, 2014年11月, 日本語, 京都, 国内会議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口頭発表（一般）
- 第92期日本機械学会流体工学部門講演会, 2014年10月, 日本語, 日本機械学会, 富山, 国内会議超音波流速分布計測法を用いた高流量計測手法の開発口頭発表（一般）
- 第92期日本機械学会流体工学部門講演会, 2014年10月, 日本語, 日本機械学会, 富山, 国内会議水平管群を横切る気液二相流の流路内ボイド率分布計測口頭発表（一般）
- 10th World Conference on Neutron Radiography, 2014年10月, 英語, Grindelwald, Switzerland, 国際会議Visualization of Water Accumulation Process in Polymer Electrolyte Fuel Cell using Neutron Radiographyポスター発表
- 第42回可視化情報シンポジウム, 2014年07月, 日本語, 可視化情報学会, 東京, 国内会議超音波パルスドップラ法の速度限界の拡張と高流量計測への適用口頭発表（一般）
- 第42回可視化情報シンポジウム, 2014年07月, 日本語, 可視化情報学会, 東京, 国内会議超音波パルスドップラ法における壁面近傍での測定体積による計測速度への影響口頭発表（一般）
- 混相流シンポジウム2014, 2014年07月, 日本語, 日本混相流学会, 札幌, 国内会議中性子ラジオグラフィによる超臨界水熱合成装置内におけるナノ粒子生成過程の可視化口頭発表（一般）
- 混相流シンポジウム2014, 2014年07月, 日本語, 日本混相流学会, 札幌, 国内会議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口頭発表（一般）
- 第19回動力・エネルギー技術シンポジウム, 2014年06月, 日本語, 日本機械学会, 福井, 国内会議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口頭発表（一般）
- 第19回動力・エネルギー技術シンポジウム, 2014年06月, 日本語, 日本機械学会, 福井, 国内会議原子炉の枝配管における流動現象の解明口頭発表（一般）
- 第19回動力・エネルギー技術シンポジウム, 2014年06月, 日本語, 日本機械学会, 福井, 国内会議加圧水型原子炉の加圧器スプレー配管における温度変動現象の解明口頭発表（一般）
- 第51回日本伝熱シンポジウム, 2014年05月, 日本語, 日本伝熱学会, 浜松, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2014年03月, 日本語, 日本機械学会関西支部, 堺, 国内会議水平ダクトにおける気泡通過と壁面せん断応力変化に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2014年03月, 日本語, 日本機械学会関西支部, 堺, 国内会議自励振動ヒートパイプの熱輸送特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2014年03月, 日本語, 日本機械学会関西支部, 堺, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2014年03月, 日本語, 日本機械学会関西支部, 堺, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2014年03月, 日本語, 日本機械学会関西支部, 堺, 国内会議パルスドップラ法を用いた超音波流量計の信号処理アルゴリズムに関する研究口頭発表（一般）
- 第91期日本機械学会流体工学部門講演会, 2013年11月, 日本語, 日本機械学会, 福岡, 国内会議水平管群を横切る気液二相流の管周りボイド率分布計測口頭発表（一般）
- 第54回電池討論会, 2013年10月, 日本語, 大阪, 国内会議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口頭発表（一般）
- 混相流シンポジウム2013, 2013年08月, 日本語, 日本混相流学会, 長野, 国内会議超臨界水・亜臨界水混合過程の中性子ラジオグラフィによる可視化口頭発表（一般）
- 混相流シンポジウム2013, 2013年08月, 日本語, 日本混相流学会, 長野, 国内会議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口頭発表（一般）
- 第41回可視化情報シンポジウム, 2013年07月, 日本語, 可視化情報学会, 東京, 国内会議超音波パルスドップラ法における速度限界の拡張に関する研究口頭発表（一般）
- 第18回動力・エネルギー技術シンポジウム, 2013年06月, 日本語, 日本機械学会, 千葉, 国内会議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口頭発表（一般）
- 第18回動力・エネルギー技術シンポジウム, 2013年06月, 日本語, 日本機械学会, 千葉, 国内会議加圧水型原子炉の加圧器スプレー配管における温度変動現象と流動現象に関する研究口頭発表（一般）
- 第18回動力・エネルギー技術シンポジウム, 2013年06月, 日本語, 日本機械学会, 千葉, 国内会議プラント内の枝配管における流動現象の解明口頭発表（一般）
- 第50回日本伝熱シンポジウム, 2013年05月, 日本語, 日本伝熱学会, 仙台, 国内会議中性子ラジオグラフィによる超臨界水熱合成反応器内の混合状態に及ぼす反応器幾何学形状の影響の検討口頭発表（一般）
- 第50回日本伝熱シンポジウム, 2013年05月, 日本語, 日本伝熱学会, 仙台, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会 学生員卒業研究発表会, 2013年03月, 日本語, 日本機械学会, 大阪市, 国内会議超臨界水と亜臨界水を用いたナノ粒子合成プロセスにおける混合状態の可視化口頭発表（一般）
- 日本機械学会関西学生会 学生員卒業研究発表会, 2013年03月, 日本語, 日本機械学会, 大阪市, 国内会議水平管群を横切る気液二相流の流動計測口頭発表（一般）
- 日本機械学会関西学生会 学生員卒業研究発表会, 2013年03月, 日本語, 日本機械学会, 大阪市, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会 学生員卒業研究発表会, 2013年03月, 日本語, 日本機械学会, 大阪市, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会 学生員卒業研究発表会, 2013年03月, 日本語, 日本機械学会, 大阪市, 国内会議原子炉の分岐配管における潜り込み現象に関する研究口頭発表（一般）
- 熱工学コンファレンス2012, 2012年11月, 日本語, 日本機械学会, 熊本市, 国内会議平板型サーモサイフォンの熱輸送特性口頭発表（一般）
- 第53回電池討論会, 2012年11月, 日本語, 電気化学会, 福岡市, 国内会議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口頭発表（一般）
- 日本機械学会 流体工学部門講演会, 2012年11月, 日本語, 日本機械学会, 京都市, 国内会議水平ダクトにおける気泡通過時の壁面せん断応力と液膜厚さ計測口頭発表（一般）
- Seventh International Conference on Two-phase Systems for Ground and Space Applications, 2012年09月, 英語, Beijing, China, 国際会議Dynamic Characteristics and Its Control of Two-Phase flow Loop System口頭発表（基調）
- 可視化情報学会 第40回可視化情報シンポジウム, 2012年07月, 日本語, 可視化情報学会, 東京都, 国内会議ウェーブレット解析を用いた超音波ドップラ法の信号処理の検討口頭発表（一般）
- 日本機械学会 第17回動力・エネルギー技術シンポジウム, 2012年06月, 日本語, 日本機械学会, 福岡市, 国内会議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口頭発表（一般）
- 日本伝熱学会 第49回日本伝熱シンポジウム, 2012年05月, 日本語, 日本伝熱学会, 富山市, 国内会議中性子ラジオグラフィ及び数値シミュレーションによる超臨界水熱合成反応器内の混合状態の可視化口頭発表（一般）
- 日本伝熱学会 第49回日本伝熱シンポジウム, 2012年05月, 日本語, 日本伝熱学会, 富山市, 国内会議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口頭発表（一般）
- 日本伝熱学会 第49回日本伝熱シンポジウム, 2012年05月, 日本語, 日本伝熱学会, 富山市, 国内会議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）の可視化口頭発表（一般）
- 日本機械学会 関西学生会学生員卒業研究発表講演会, 2012年03月, 日本語, 日本機械学会関西支部, 吹田市, 国内会議平板型サーモサイフォンにおける内部流動及び伝熱特性に関する研究口頭発表（一般）
- 日本機械学会 関西学生会学生員卒業研究発表講演会, 2012年03月, 日本語, 日本機械学会関西支部, 吹田市, 国内会議超音波ドップラ法におけるアルゴリズムの高度化と流動計測への適応口頭発表（一般）
- 日本機械学会 関西学生会学生員卒業研究発表講演会, 2012年03月, 日本語, 日本機械学会関西支部, 吹田市, 国内会議中性子ラジオグラフィを用いた小型PEFC内水分布計測口頭発表（一般）
- 日本機械学会 関西学生会学生員卒業研究発表講演会, 2012年03月, 日本語, 日本機械学会関西支部, 吹田市, 国内会議管内強制対流沸騰二相流の圧力損失とボイド率計測口頭発表（一般）
- 日本機械学会 関西学生会学生員卒業研究発表講演会, 2012年03月, 日本語, 日本機械学会関西支部, 吹田市, 国内会議加圧水型原子炉の加圧器スプレー配管における温度変動現象と流動現象に関する研究口頭発表（一般）
- 電気化学会 第52回電池討論会, 2011年10月, 日本語, 電気化学会, 東京都, 国内会議高空間分解能中性子らジオグラフィ計測システムを用いたPEFC内膜厚方向水分布計測口頭発表（一般）
- 日本混相流学会 年会講演会2011, 2011年08月, 日本語, 日本混相流学会, 京都市, 国内会議中性子ラジオグラフィによる超臨界水・亜臨界水混合状態の可視化口頭発表（一般）
- 日本混相流学会 年会講演会2011, 2011年08月, 日本語, 日本混相流学会, 京都市, 国内会議中性子ラジオグラフィによるサブクール沸騰のボイド率測定口頭発表（一般）
- Proc. of Int. Conf. on Advanced Technology in Experimental Mechanics 2011 (ATEM’11), 2011年08月, 英語, 日本機械学会, 神戸市, 国際会議Quantitative Measurements of Water Distribution in a PEFC by using Neutron Radiography and Analysis of Gas-velocity Distributions口頭発表（一般）
- 日本機械学会 第16回動力・エネルギー技術シンポジウム, 2011年06月, 日本語, 日本機械学会, 吹田市, 国内会議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PEFC内水分布の三次元可視化・計測口頭発表（一般）
- 日本伝熱学会 第48回日本伝熱シンポジウム, 2011年06月, 日本語, 日本伝熱学会, 岡山市, 国内会議中性子ラジオグラフィによる超臨界水熱合成反応器内の流動・混合状態のその場観察口頭発表（一般）
- 日本機械学会 第16回動力・エネルギー技術シンポジウム, 2011年06月, 日本語, 日本機械学会, 吹田市, 国内会議中性子ラジオグラフィによるPEFC内水分布の計測とネットワークモデルによるガス流動解析口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議平板型サーモサイフォンにおける伝熱特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議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・計測口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議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口頭発表（一般）
- 日本機械学会関西支部第86期定時総会講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議多孔質面内における水の凍結挙動に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議水平ダクト内気液二相流における壁面せん断応力と流動に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議界面活性剤溶液の摩擦損失低減効果と熱伝達特性口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2011年03月, 日本語, 日本機械学会関西支部, 京都市, 国内会議加速器ターゲットにおける熱流動口頭発表（一般）
- 第51回電池討論会, 2010年10月, 日本語, 電気化学会, 名古屋市, 国内会議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口頭発表（一般）
- 第51回電池討論会, 2010年10月, 日本語, 電気化学会, 名古屋市, 国内会議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口頭発表（一般）
- 日本混相流学会 年会講演会2010, 2010年07月, 日本語, 日本混相流学会, 浜松市, 国内会議超音波流速分布計測法を用いた水平ダクト内気液二相流の流動計測口頭発表（一般）
- 日本混相流学会 年会講演会2010, 2010年07月, 日本語, 日本混相流学会, 浜松市, 国内会議超音波流速分布計測法による二相流計測のための気液界面同定手法の検討口頭発表（一般）
- 日本混相流学会 年会講演会2010, 2010年07月, 日本語, 日本混相流学会, 浜松市, 国内会議小型中性子源用加速器ターゲットの熱水力設計口頭発表（一般）
- 日本機械学会 第15回動力・エネルギー技術シンポジウム, 2010年06月, 日本語, 日本機械学会, 東京都, 国内会議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内水分布の可視化口頭発表（一般）
- 第17回燃料電池シンポジウム, 2010年05月, 日本語, 燃料電池開発情報センター, 東京都, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2010年03月, 日本語, 日本機械学会, 神戸市, 国内会議超音波を用いた二相流計測手法の開発口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2010年03月, 日本語, 日本機械学会, 神戸市, 国内会議中性子ラジオグラフィを用いた固体高分子形燃料電池内水挙動の三次元可視化口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2010年03月, 日本語, 日本機械学会, 神戸市, 国内会議中性子ラジオグラフィを用いた固体高分子形燃料電池内の膜圧方向水分布計測口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2010年03月, 日本語, 日本機械学会, 神戸市, 国内会議小型中性子源用加速器ターゲットの熱水力設計口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2010年03月, 日本語, 日本機械学会, 神戸市, 国内会議界面活性剤溶液を用いた摩擦損失低減効果に関する研究口頭発表（一般）
- 日本機械学会熱工学コンファレンス2009, 2009年11月, 日本語, 日本機械学会, 宇部市, 国内会議中性子ラジオグラフィによる固体高分子形燃料電池内の膜圧方向水分布の計測口頭発表（一般）
- 日本機械学会熱工学コンファレンス2009, 2009年11月, 日本語, 日本機械学会, 宇部市, 国内会議界面活性剤溶液による摩擦損失低減効果中における熱伝達特性に関する研究口頭発表（一般）
- 日本混相流学会年会講演会 2009, 2009年08月, 日本語, 日本混相流学会, 熊本市, 国内会議摩擦損失低減効果に関する研究口頭発表（一般）
- 日本混相流学会年会講演会 2009, 2009年08月, 日本語, 日本混相流学会, 熊本市, 国内会議原子炉の枝配管における温度変動現象に関する研究口頭発表（一般）
- 日本混相流学会年会講演会 2009, 2009年08月, 日本語, 日本混相流学会, 熊本市, 国内会議加圧水型原子炉の加圧器曲がり配管における温度変動現象に関する研究口頭発表（一般）
- ヒートパイプ協会 総会講演会, 2009年07月, 日本語, ヒートパイプ協会, 東京, 国内会議ヒートパイプ内冷媒挙動の可視化・計測口頭発表（招待・特別）
- 日本伝熱学会 第46回日本伝熱シンポジウム, 2009年06月, 日本語, 日本伝熱学会, 京都市, 国内会議溶射皮膜を有する狭隘流路内沸騰熱伝達に及ぼす流路姿勢の影響口頭発表（一般）
- 日本伝熱学会 第46回日本伝熱シンポジウム, 2009年06月, 日本語, 日本伝熱学会, 京都市, 国内会議可変コンダクタンスヒートパイプ(VCHP)安定化技術の開発 第2報:中性子ラジオグラフィによる内部流体挙動の可視化口頭発表（一般）
- 日本伝熱学会 第46回日本伝熱シンポジウム, 2009年06月, 日本語, 日本伝熱学会, 京都市, 国内会議可変コンダクタンスヒートパイプ(VCHP)安定化技術の開発 第1報:気液分離構造の評価口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議中性子ラジオグラフィによるダイナミックCT計測技術の開発口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議水平ダクト内二相流の流動計測に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議界面活性剤溶液による摩擦損失低減効果中における熱伝達特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議加速器ターゲットにおける沸騰熱伝達および圧力損失特性口頭発表（一般）
- 日本機械学会関西支部第84期定時総会講演会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議加速器ターゲットにおける熱流動に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議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口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2009年03月, 日本語, 日本機械学会関西支部, 東大阪市, 国内会議ガス給湯器用潜熱回収熱交換器での結露水挙動の観察口頭発表（一般）
- The 6th Int. Topical Meeting on Neutron Radiography, 2008年09月, 英語, Int. Society for Neutron Radiography, Kobe, 国際会議Visualization of Oil Behavior in a Small 4-cycle Engine by Electrical Motoringポスター発表
- The 6th Int. Topical Meeting on Neutron Radiography, 2008年09月, 英語, Int. Society for Neutron Radiography, Kobe, 国際会議Three-Dimensional Observation of Water Distribution in PEFC by Neutron CTポスター発表
- The 6th Int. Topical Meeting on Neutron Radiography, 2008年09月, 英語, Int. Society for Neutron Radiography, Kobe, 国際会議Nondestructive Inspection for Boiling Flow in Plate Heat Exchanger by Neutron Radiography口頭発表（一般）
- The 6th Int. Topical Meeting on Neutron Radiography, 2008年09月, 英語, Int. Society for Neutron Radiography, Kobe, 国際会議Flow Visualization of Refrigerant in a Self-Vibration Heat Pipe by Neutron Radiographyポスター発表
- The 6th Int. Topical Meeting on Neutron Radiography, 2008年09月, 英語, Int. Society for Neutron Radiography, Kobe, 国際会議Evaluation of Water Distribution Effect on Performances of JARI Standard PEFC by using Neutron Radiography口頭発表（一般）
- The 6th Int. Topical Meeting on Neutron Radiography, 2008年09月, 英語, Int. Society for Neutron Radiography, Kobe, 国際会議Evaluation of Spatial Resolution on ZnS:Ag10B2O3 Type Scitillation Converter for Neutron Imaging口頭発表（一般）
- 第45回アイソトープ・放射線研究発表会, 2008年07月, 日本語, 日本アイソトープ協会, 東京, 国内会議中性子ラジオグラフィによる固体高分子形燃料電池JARI標準セル内結露水挙動の可視化と計測口頭発表（一般）
- 第45回日本伝熱シンポジウム, 2008年05月, 日本語, 日本伝熱学会, つくば市, 国内会議中性子ラジオグラフィによる自励振動型ヒートパイプの可視化口頭発表（一般）
- 第45回日本伝熱シンポジウム, 2008年05月, 日本語, 日本伝熱学会, つくば市, 国内会議中性子ラジオグラフィによるエンジン内部のオイル挙動の可視化口頭発表（一般）
- 第45回日本伝熱シンポジウム, 2008年05月, 日本語, 日本伝熱学会, つくば市, 国内会議プレート熱交換器内沸騰熱伝達に及ぼす流動方向の影響口頭発表（一般）
- 第45回日本伝熱シンポジウム, 2008年05月, 日本語, 日本伝熱学会, つくば市, 国内会議PEFCのセル電圧および圧力損失変動と結露水分布の相関性評価(中性子ラジオグラフィーによる同時可視化計測)口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議中性子ラジオグラフィを用いた固体高分子形燃料電池内水分布の可視化と計測(2.CT用小型燃料電池における可視化と計測)口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議中性子ラジオグラフィを用いた固体高分子形燃料電池内水分布の可視化と計測(1.JARI標準セルを用いた可視化と計測)口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議自励振動型ヒートパイプにおける熱流動現象に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議温水蓄熱器を分散配置した集合住宅向けコジェネレーションシステムに関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議マイクロバブルによる摩擦抵抗低減効果に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議プレート熱交換器内沸騰二相流の流動特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表会, 2008年03月, 日本語, 日本機械学会, 吹田市, 国内会議ガス給湯器用潜熱回収熱交換器のコンパクト化に関する研究口頭発表（一般）
- 宇宙利用シンポジウム(第24回), 2008年01月, 日本語, 日本学術会議, 東京, 国内会議狭隘流路内沸騰二相流における溶射皮膜による伝熱促進効果に関する研究ポスター発表
- 日本原子力学会 2007年秋の大会, 2007年10月, 日本語, 日本原子力学会, 北九州市, 国内会議中性子イメージング用シンチレータの空間分解能に及ぼす膜厚の影響口頭発表（一般）
- 第12回動力・エネルギー技術シンポジウム, 2007年06月, 日本語, 日本機械学会, 東京, 国内会議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の可視化と計測口頭発表（一般）
- 第44 回日本伝熱シンポジウム講演論文集, 2007年05月, 日本語, 日本伝熱学会, 長崎, 国内会議中性子ラジオグラフィによる固体高分子形燃料電池内の発電時水分布の同時計測口頭発表（一般）
- 第44 回日本伝熱シンポジウム講演論文集, 2007年05月, 日本語, 日本伝熱学会, 長崎, 国内会議パラフィンエマルジョンの熱流動特性に関する研究口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2007年03月, 日本語, 日本機械学会, 大東市, 国内会議摩擦損失低減効果発生機構の解明口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2007年03月, 日本語, 日本機械学会, 大東市, 国内会議集合住宅用コージェネレーションシステムの開発口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2007年03月, 日本語, 日本機械学会, 大東市, 国内会議給湯器用潜熱回収熱交換器の最適設計口頭発表（一般）
- 日本機械学会関西学生会学生員卒業研究発表講演会, 2007年03月, 日本語, 日本機械学会, 大東市, 国内会議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口頭発表（一般）
- 熱工学カンファレンス2006, 2006年11月, 日本語, 日本機械学会, 横浜市, 国内会議溶射加工を施したコールドプレートにおける急加熱時の沸騰熱伝達特性口頭発表（一般）
- 熱工学カンファレンス2006, 2006年11月, 日本語, 日本機械学会, 横浜市, 国内会議パラフィンエマルジョンの熱流動特性に関する研究口頭発表（一般）
- 日本冷凍空調学会年次大会, 2006年10月, 日本語, 日本冷凍空調学会, 福岡市, 国内会議溶射加工を施した狭隘流路の沸騰熱伝達に関する研究口頭発表（一般）
- 日本冷凍空調学会年次大会, 2006年10月, 日本語, 日本冷凍空調学会, 福岡市, 国内会議プレート熱交換器内沸騰熱伝達に及ぼす流れ方向の影響に関する研究口頭発表（一般）
- the 8th World Conference on Neutron Radiography, 2006年10月, 英語, International Society for Neutron Radiography, Gaithersburg, USA, 国際会議Visualization of a Self-Vibration Heat Pipe by Neutron Radiography口頭発表（一般）
- 日本混相流学会年会講演会, 2006年08月, 日本語, 日本混相流学会, 金沢市, 国内会議溶射加工を施した狭隘流路内沸騰熱伝達に関する研究口頭発表（一般）
- 日本混相流学会年会講演会, 2006年08月, 日本語, 日本混相流学会, 金沢市, 国内会議二相流体ループの動特性とその制御[招待有り]口頭発表（招待・特別）
- 日本混相流学会年会講演会, 2006年08月, 日本語, 日本混相流学会, 金沢市, 国内会議プレート熱交換器内沸騰二相流の伝熱特性に関する研究口頭発表（一般）
- 第43 回日本伝熱シンポジウム, 2006年05月, 日本語, 日本伝熱学会, 名古屋, 国内会議中性子ラジオグラフィによる自励振動型ヒートパイプの可視化口頭発表（一般）
■ 共同研究・競争的資金等の研究課題
- 日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 神戸大学, 2021年04月01日 - 2024年03月31日高速超音波トモグラフィを用いた磁場印加時の液体金属二相流の流動評価とモデリング申請者が開発した超音波トモグラフィ法を用いて、ガリウム合金中を上昇する連続気泡を対象に、気泡径、気泡間隔および水平磁場印加時の気泡挙動を実験的に評価することを目的に、研究を実施した。 本年度は試験体系を検討し、連続鋳造で使用されている磁場制御条件も参考に、水平磁場を400mT以上印加するものとした。さらに試験部として、内径50mmの円筒容器とすることで、直径250mm以上の領域において均一な水平磁場を印加可能な電磁石を選定した。液体金属中を上昇する連続気泡にって生じる後流渦の影響を評価するためには、同一の気泡径において異なる気泡離脱周期を実現する気泡発生部が必要となる。そこで、スピーカーを用いた音圧変動を利用することで気泡離脱周期を可変とする気泡注入部を製作し、ガリウム合金への適用性についてX線ラジオグラフィおよび超音波トモグラフィ法で評価した。それにより気泡生成周波数が5Hzまでの条件において、等価径が均一な連続気泡を生成可能であることを確認した。さらに円筒容器において、単一および連続して気泡を上昇させ、断面ボイド分布の連続CT計測を行った。容器底部から20mmの位置を入口条件とし、計測位置140mmの位置において、20mmの位置からのボイド分布の変化を評価することで、気泡離脱周期の違いが及ぼす気泡分散への影響について評価した。更に容器底部に設置した超音波センサを用いて、ドップラ法による速度計測を行った。その結果、磁場強度が弱い条件では、磁場強度を増加させるにつれて気泡上昇速度が増加し、磁場強度を更に増加させると気泡上昇速度が低下することを示した。トモグラフィ計測による結果でも、磁場強度を増加するにつれて、連続する気泡がほぼ同じ計測断面を通過することが示され、気泡通過間隔も一定となることを実験的に示した。
- 科学研究費補助金／基盤研究(B), 2017年04月 - 2020年03月競争的資金
- 学術研究助成基金助成金／基盤研究(C), 2016年04月 - 2019年03月競争的資金
- 日本学術振興会, 科学研究費助成事業 挑戦的萌芽研究, 挑戦的萌芽研究, 東北大学, 2016年04月01日 - 2018年03月31日粒径3 mmのアルミナ粒子を充填したSUS製1/2 inch管からなる充填層型反応器を対象として，窒素ガスもしくは超臨界水雰囲気下での重質油の反応器内流動挙動を中性子ラジオグラフィにより観察した。重質油／窒素ガス系においては，常圧下で重質油流動挙動に及ぼす反応器内温度の影響を明らかにした。特に，高温の場合においては，極端な偏流が観察された。一方，重質油／超臨界水系においては，反応器内温度を400℃，圧力を25 MPaとし，流動挙動に及ぼす重質油流量の影響を検討した。本研究を通して，金属製充填層型反応器内の重質油流動挙動の可視化法として，中性子ラジオグラフィが有効であることが示された。
- 科学研究費補助金／基盤研究(C), 2012年04月 - 2015年03月競争的資金
- 科学研究費補助金／基盤研究(C), 2009年競争的資金
- 日本学術振興会, 科学研究費助成事業 奨励研究, 奨励研究, 神戸大学工学部, 2004年 - 2004年細管内熱伝達及び流動特性に関する研究
研究シーズ
■ 研究シーズ- 平板型ヒートパイプによる熱分散技術の高性能化シーズカテゴリ：エネルギー, ものづくり技術（機械・電気電子・化学工業）研究キーワード：熱分散技術, 強制空冷領域, ヒートパイプ, 熱伝達, 高発熱密度研究の背景と目的：電子機器や電源装置では発熱密度が上昇し強制空冷領域を超えようとしています。今後、更なる高発熱密度化に対応するため、冷媒を用いた高性能な熱分散技術が必要とされています。この熱分散技術の一つに、発熱部から放熱部に熱を輸送するヒートパイプがあります。ヒートパイプは液体の蒸発・凝縮時の潜熱を利用し、少量の作動流体を封入するだけで外部動力を必要としません。このヒートパイプの更なる高性能化を目的としています。研究内容：自励振動式ヒートパイプは平板内部に1本の流路が蛇行した形で配され、その中に作動液を封入し温度差を与えることで内部に圧力差が生じ作動液が自励振動を開始します。この自励振動により熱が輸送されますが、その作動原理が解明されていません。そこで、中性子ラジオグラフィを用いた可視化計測を行っています。可視化画像の一例を示します。画像上部に縦に黒い線の様に見えているのが作動液です。作動液は約10m/secという速さで加熱部と冷却部を移動します。その際、壁との熱交換により熱を加熱部から冷却部への移動させます。加熱量により作動液の速度や移動距離などが変化し、その移動速度限界も確認できました。この作動液と流路形状の関係および最大熱輸送量などが設計上重要で、その解明をすすめています。
期待される効果や応用分野：液冷却方式のみであった高発熱密度電子機器冷却に利用することにより、コンパクト化および軽量化が図れる。外部動力が不要なことから、その他のエネルギーシステムの非常用冷却装置として利用できる。