Research activity information

• Aug. 2023 The Japanese Society for Multiphase Flow, Outstanding Paper Award, 鉛直管におけるフラッディング状態での管内流動特性

  高木俊弥, 村瀬道雄, 栗本 遼, 林 公祐, 冨山明男


• Aug. 2022 The Japanese Society for Multiphase Flow, Outstanding Paper Award, 変形気泡に働くせん断誘起揚力に関する研究

  Kosuke Hayashi, Akio Tomiyama

  共同研究・競争的資金等の業績IDIRI


• Oct. 2021 神戸大学工学部, 工学部優秀教育賞

  林 公祐


• Mar. 2021 IOP publishing, Outstanding Reviewer Award 2020 (Fluid Dynamics Research)


• Nov. 2020 マツダ財団, マツダ研究助成奨励賞

  林 公祐


• Aug. 2017 日本混相流学会, 日本混相流学会「論文賞」, 鉛直管における気液対向流制限

  楠木 貴世志, 山本 泰功, 村瀬 道雄, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Others


• May 2013 15th International Topical Meeting on Nuclear Reactor Thermalhydraulics (NURETH-15), Best Poster Award, Void Distribution and Bubble Motion in Bubbly Flows in a 4 X 4 Rod Bundle

  HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  The “best” poster based on the structure of the presentation (visual quality)

  International society


• Mar. 2013 日本学術会議IUTAM分科会, 第62回理論応用力学講演会 優秀講演賞, 粘性力及び表面張力の評価法が界面運動の数値予測に及ぼす影響

  HAYASHI KOSUKE

  36歳未満の若手研究者による優秀な講演に対して授与される

  Japan society


• Jul. 2010 日本混相流学会, 日本混相流学会 奨励賞, 円管内気泡及び液滴の終端上昇速度に関する研究

  HAYASHI, Kosuke

  「奨励賞」は、本会会誌または他の学術誌、あるいは本会主催・共催の国際会議論文集に掲載された論文または技術報告（原則として３年以内）を対象とし、際立った独創性、新規性、将来性などが期待され40歳以下の本会会員に贈呈する。

  International academic award


• Feb. 2006 日本機械学会, 第18回計算力学講演会 学生優秀講演賞, 表面張力評価へのカーン‐ヒリヤード方程式の応用

  HAYASHI KOSUKE

  Japan society


• Sep. 2004 日本混相流学会, 日本混相流学会年会講演会2004 学生優秀講演賞, 改良SCAによる流体粒子の界面追跡計算

  HAYASHI KOSUKE

  Japan society

• Experimental analysis of velocity field characteristics within bubble wakes in fiber bundle

  Roberta Fatima Neumeister, Ryo Kurimoto, Ryuya Komine, Gherhardt Ribatski, Kosuke Hayashi

  Last, Mar. 2025, International Journal of Multiphase Flow, accepted, English

  [Refereed]

  Scientific journal


• Drag and Interfacial Vorticity of Spherical Bubble Contaminated with Soluble Surfactant

  Kosuke Hayashi, Yuya Motoki, Dominique Legendre, Akio Tomiyama

  Feb. 2025, International Journal of Multiphase Flow, 187, 105173, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Drift-flux parameters of heterogeneous bubbly flows in air-water cylindrical bubble column

  Shohei Sasaki, Ryo Kurimoto, Kosuke Hayashi

  Last, Elsevier BV, Feb. 2025, Chemical Engineering Research and Design, 215, 274 - 284, English

  [Refereed]

  Scientific journal


• Void Fraction and Interfacial Friction in a 3×3 Rod Bundle under Stagnant Liquid Conditions

  Ryo Kurimoto, Michio Murase, Koji Nishida, Toshiya Takaki, Kosuke Hayashi, Akio Tomiyama

  Begell House, Feb. 2025, Multiphase Science and Technology, 37(1) (1), 57 - 69, English

  [Refereed]

  Scientific journal


• Shapes of surfactant-laden Taylor bubbles in a square microchannel

  Ryota Igarashi, Riku Hachikubo, Ryo Kurimoto, Kosuke Hayashi

  Abstract Experiments on contaminated Taylor flows in a square microchannel were carried out to investigate the effects of surfactant on the bubble shape in the nose and tail regions for different surfactant properties. The nose curvature was found to be proportional to the bubble length at low surfactant concentrations, while it was independent of the concentration at high concentrations. The rate of increase in the nose curvature at the former concentrations can be expressed in terms of the surface coverage ratio. The bubble velocity decreased with increasing the nose curvature, whereas the surface tension reduced by surfactant adsorption worked better to correlate the velocity data. The curvature of the bubble tail increased steeply at low concentrations as a consequence of the early coverage due to interfacial advection. The tail curvature also had a strong correlation with the surface coverage ratio.

  Springer Science and Business Media LLC, Jan. 2025, Microfluidics and Nanofluidics, 29, #8, English

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Prediction of Liquid Film Thickness and Pressure Gradient of Swirling Annular Flows in Vertical Pipes Based on One-dimensional Three-fluid Model

  古東 遼也, 栗本 遼, 林 公祐, 冨山 明男

  Dec. 2024, Japanese Journal of Multiphase Flow, 38(4) (4), 404 - 414, Japanese

  [Refereed]

  Scientific journal


• Effects of Diameters on Flow Characteristics in Vertical Pipes under Flooding Conditions

  Toshiya TAKAKI, Ryo KURIMOTO, Kosuke HAYASHI, Michio MURASE, Akio TOMIYAMA

  Dec. 2024, Japanese Journal of Multiphase Flow, 38(4) (4), 423 - 434, English

  [Refereed]

  Scientific journal


• Velocity Field External to a Tube Bundle Applying Spatial Filter Velocimetry and Machine Learning

  Roberta Fatima Neumeister, Douglas Martins Rocha, Ryuya Komine, Ryo Kurimoto, Kosuke Hayashi, Gherhardt Ribatski

  Nov. 2024, 20th Brazilian Congress of Thermal Sciences and Engineering (ENCIT2024), 1 - 8, English

  [Refereed]

  International conference proceedings


• Experimental Analysis of Velocity Fields within the Bubble Wakes

  Roberta Fatima Neumeister, Ryuya Komine, Ryo Kurimoto, Gherhardt Ribatski, Kosuke Hayashi

  Last, Nov. 2024, 20th Brazilian Congress of Thermal Sciences and Engineering (ENCIT2024), 1 - 8, English

  [Refereed]

  International conference proceedings


• Experimental Analysis of Bubble Terminal Velocity in the Presence of Fibers in Aqueous Solutions

  R. Komine, R. F. Neumeister, N. A. B. Ariffin, R. Kurimoto, G. Ribatski, K. Hayashi

  Nov. 2024, The 34th International Symposium on Transport Phenomena, 1 - 5, English

  [Refereed]

  International conference proceedings


• Fully-Contaminated State of Single Bubbles in Surfactant-laden Water at Concentrations beyond CMC

  Y. Iwai, R. Kurimoto, K. Hayashi, D. Legendre, S. Hosokaw

  Corresponding, Nov. 2024, The 34th International Symposium on Transport Phenomena, 1 - 4, English

  [Refereed]

  International conference proceedings


• Effects of Surfactant on Shape of Taylor Bubbles in a Square Microchannel

  R. Igarashi, R. Hachikubo, R. Kurimoto, K. Hayashi

  Nov. 2024, The 34th International Symposium on Transport Phenomena, 1 - 4, English

  [Refereed]

  International conference proceedings


• Pressure drop and bubble velocity in Taylor flow through square microchannel

  Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Abstract Interface tracking simulations of gas–liquid Taylor flow in horizontal square microchannels were carried out to understand the relation between the pressure drop in the bubble part and the curvatures at the nose and tail of a bubble. Numerical conditions ranged for 0.00159 ≤ Ca_T ≤ 0.0989, 0.0817 ≤ We_T ≤ 25.4, and 8.33 ≤ Re_T ≤ 791, where Ca_T, We_T, and Re_T are the capillary, Weber, and Reynolds numbers based on the total volumetric flux. The dimensionless pressure drop in the bubble part increased with increasing the capillary number and the Weber number. The curvature at the nose of a bubble increased and that at the tail of a bubble decreased as the capillary number increased. The variation of the curvature at the tail of a bubble was more remarkable than that at the nose of a bubble due to the increase in the Weber number, which was the main cause of large pressure drop in the bubble part at the same capillary number. The relation between the bubble velocity and the total volumetric flux was also discussed. The distribution parameter of the drift-flux model without inertial effects showed a simple relation with the capillary number. A correlation of the distribution parameter, which is expressed in terms of the capillary number and the Weber number, was developed and was confirmed to give good predictions of the bubble velocity.

  Springer Science and Business Media LLC, Jul. 2024, Microfluidics and Nanofluidics, 28(8) (8)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Shapes and terminal velocities of single bubbles rising through fiber bundle in stagnant water

  Ryo Kurimoto, Roberta Fátima Neumeister, Ryuya Komine, Gherhardt Ribatski, Kosuke Hayashi

  Elsevier BV, Jul. 2024, Chemical Engineering Science, 120557 - 120557

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Prediction of Size Distribution of Microbubbles in Water with Mass Transfer

  Yuegui Li, Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama, Yasunari Maeda

  Corresponding, Begell House, Jun. 2024, Multiphase Science and Technology, 36(2) (2), 41 - 54, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of pipe diameter on interfacial and wall friction factors of swirling annular flows in a vertical pipe

  Ryoya Koto, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, Jun. 2024, Multiphase Science and Technology, 36(2) (2), 55 - 73, English

  [Refereed]

  Scientific journal


• Surface coverage ratio of contaminated taylor bubbles in a square microchannel

  Takumi Mori, Ryota Igarashi, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Corresponding, Elsevier BV, Apr. 2024, Chemical Engineering Research and Design, 204, 343 - 353, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A vertebrobasilar junction aneurysm successfully treated with a combination of surgical clipping and flow diverter placement based on the results of computational fluid dynamics analysis: illustrative case

  Tatsuya Mori, Hidehito Kimura, Atsushi Fujita, Kosuke Hayashi, Tatsuo Hori, Masahiro Sugihara, Yusuke Ikeuchi, Masaaki Kohta, Akio Tomiyama, Takashi Sasayama

  BACKGROUND The treatment of vertebrobasilar junction (VBJ) aneurysms is challenging. Although flow diverters (FDs) are a possible treatment option, geometrical conditions hinder intervention. VBJ aneurysms possess dual inflow vessels from the bilateral vertebral arteries (VAs), one of which is ideally occluded prior to FD treatment. However, it remains unclear which VA should be occluded. OBSERVATIONS A 75-year-old male with a growing VBJ complex aneurysm exhibiting invagination toward the brainstem and causing perifocal edema required intervention. Preoperative computational fluid dynamics (CFD) analysis demonstrated that left VA occlusion would result in more stagnant flow and less impingement of flow than right VA occlusion. According to the simulated strategy, surgical clipping of the left VA just proximal to the aneurysm was performed, followed by FD placement from the basilar artery trunk to the right VA. The patient demonstrated tolerance of the VA occlusion, and follow-up computed tomography angiography at 18 months after FD treatment confirmed the disappearance of the aneurysm. LESSONS Preoperative flow dynamics simulations using CFD analysis can reveal an optimal treatment strategy involving a hybrid surgery that combines FD placement and direct surgical occlusion for a VBJ complex aneurysm.

  Journal of Neurosurgery Publishing Group (JNSPG), Mar. 2024, Journal of Neurosurgery: Case Lessons, 7(10) (10), CASE23736, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Gas-liquid Interfacial Friction Factor under Flooding Conditions in Vertical Pipes

  Toshiya TAKAKI, Masaki YAMASHITA, Ryo KURIMOTO, Kosuke HAYASHI, Michio MURASE, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Dec. 2023, JAPANESE JOURNAL OF MULTIPHASE FLOW, 37(4) (4), 401 - 411, Japanese

  [Refereed]

  Scientific journal


• Wall Friction and Void Fraction in a 3×3 Rod Bundle under Stagnant Liquid Conditions

  Michio MURASE, Koji NISHIDA, Toshiya TAKAKI, Shin-ichiro KIDA, Ryo KURIMOTO, Kosuke HAYASHI, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Dec. 2023, JAPANESE JOURNAL OF MULTIPHASE FLOW, 37(4) (4), 392 - 400, Japanese

  [Refereed]

  Scientific journal


• Effects of Surfactant on Bubbly Flow in Narrow Rectangular Column

  Soichiro Horita, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Nov. 2023, 12th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF 2023), 1 - 3, English

  [Refereed]

  International conference proceedings


• Measurements of Surfactant Amount at the Gas-Liquid Interface in Contaminated Taylor Flows in a Microchannel

  Takumi Mori, Ryota Igarashi, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Corresponding, Nov. 2023, 12th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF 2023), 1 - 4, English

  [Refereed]

  International conference proceedings


• Drag Coefficients of Particle-Covered Bubbles Produced Using a Microchannel

  Kosuke Hayashi, Koya Chujo, Ryo Kurimoto, Akio Tomiyama

  Nov. 2023, 12th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF 2023), 1 - 3, English

  [Refereed]

  International conference proceedings


• Bubbly flows in a column with submerged hollow fiber membranes

  Ryo Kurimoto, Shin Takaya, Kosuke Hayashi, Akio Tomiyama

  Elsevier BV, Nov. 2023, Chemical Engineering Research and Design

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of liquid viscosity on interfacial and wall friction factors of swirling annular flows in a vertical pipe

  Ryoya Koto, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Elsevier BV, Oct. 2023, Nuclear Engineering and Design, 412, 112476 - 112476

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Velocity field characterization of single-phase flows across a tube bundle through spatial filter velocimetry

  Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

  Elsevier BV, Sep. 2023, Experimental Thermal and Fluid Science, 147, 110947 - 110947, English

  [Refereed]

  Scientific journal


• Effects of microbubbles on removal of viscous oil adhering to channel wall

  Yuegui Li, Kosuke Hayashi, Fuyuki Okamoto, Shigeo Hosokawa, Akio Tomiyama

  Corresponding, Elsevier BV, May 2023, Chemical Engineering Research and Design, 193, 75 - 84, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Void Fraction of Air-Water Two-Phase Flows in a Vertically Placed Horizontal U-Bend

  Kosuke Hayashi, Shosuke Yasui, Ryo Kurimoto, Akio Tomiyama

  Informa UK Limited, Mar. 2023, Heat Transfer Engineering, 1 - 14, English

  [Refereed][Invited]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Study on Void Fractions of Large and Small Bubbles in a Bubble Column

  Nobuya KOBAYASHI, Ryo KURIMOTO, Kosuke HAYASHI, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Jan. 2023, JAPANESE JOURNAL OF MULTIPHASE FLOW, 37(1) (1), 128 - 137, English

  Scientific journal


• EFFECTS OF SURFACTANT ON LIFT COEFFICIENT OF ELLIPSOIDAL BUBBLES IN THE VISCOUS-FORCE DOMINANT REGIME

  Junming Chen, Kosuke Hayashi, Dominique Legendre, Dirk Lucas, Akio Tomiyama

  Effects of surfactants on lift coefficients, <i>C_L</i>, of single ellipsoidal bubbles rising through linear shear flows were investigated. Two types of surface-active agents, Triton X-100 and 1-octanol, were used. The liquid properties except for the surface tension were identical to those in a clean system of logM &#61; -5.5, where M is the Morton number. The range of the bubble Reynolds number was 0.1 &#60; Re &#60; 70. Bubble shapes were either spherical or ellipsoidal. Comparing with clean bubbles, less deformation of contaminated bubbles was confirmed. A shape correlation without taking the dimensionless shear rate into account gave good evaluations of the bubble aspect ratio, which means that the shear rate is not a dominant factor causing the change of shape deformation. However, drag coefficients were affected by the shear rate. A new correlation of drag coefficients was deduced, which agreed well with the experimental data. Both clean and contaminated <i>C_L</i> data showed a similar tendency: after a drastic decrease in <i>C_L</i>, <i>C_L</i> slightly increases and then decreases to a negative value while increasing the bubble Reynolds number, Re. A difference in concentration of Trion X-100 resulted in only a slight change in <i>C_L</i> at high Re regime. Different types of surfactant resulted in noticeably different values of <i>C_L</i> especially at low Re. The <i>C_L</i> of small bubbles in contaminated systems could be reproduced by a correlation for solid particles, supporting that fully contaminated spherical bubbles behave like solid spheres. For deformed bubbles, <i>C_L</i> can be expressed by relating the negative lift force due to shape deformation with the drag force.

  Begell House, 2023, Multiphase Science and Technology, 35(1) (1), 55 - 68, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Carbon dioxide-water bubbly flow in a vertical pipe with or without chemical absorption

  Devy Setiorini Sa'adiyah, Kanta Sato, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, 2023, Multiphase Science and Technology, 35(2) (2), 29 - 41, English

  [Refereed]

  Scientific journal


• Effects of swirl intensity on interfacial and wall friction factors of annular flows in a vertical pipe

  Ryoya Koto, Ryo Kurimoto, Atsuya Imaizumi, Kosuke Hayashi, Akio Tomiyama

  Elsevier BV, Dec. 2022, Nuclear Engineering and Design, 399, 112001 - 112001, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Wall Friction Factor and Void Fraction in Vertical Pipes under Flooding Conditions

  Toshiya TAKAKI, Masaki YAMASHITA, Ryo KURIMOTO, Kosuke HAYASHI, Michio MURASE, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Nov. 2022, JAPANESE JOURNAL OF MULTIPHASE FLOW, 36(4) (4), 440 - 451, English

  [Refereed]

  Scientific journal


• Effects of Upper and Lower Pipe Ends on Interfacial and Wall Friction Factors under Counter-Current Flow Limitation in a Vertical Pipe

  Masaki Yamashita, Ryo Kurimoto, Kosuke Hayashi, Toshiya Takaki, Michio Murase, Akio Tomiyama

  Nov. 2022, 2022 ANS Winter Meeting and Technology Expo, 1 - 2, English

  [Refereed]


• Effects of Liquid Viscosity on Friction Factors of Gas-Liquid Swirling Annular Flows in a Vertical Pipe

  Ryoya Koto, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Nov. 2022, 2022 ANS Winter Meeting and Technology Expo, 1 - 2, English

  [Refereed]

  International conference proceedings


• Void Fractions in U-Bends of a Serpentine Tube

  Junichiro Kazi, Jumpei Fukuma, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Corresponding, Begell House, Sep. 2022, Multiphase Science and Technology, 34(4) (4), 41 - 55, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of Initial Liquid Height and Liquid Viscosity on Total Gas Holdup in a Bubble Column

  Nobuya Kobayashi, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, Aug. 2022, Multiphase Science and Technology, 34(4) (4), 1 - 13, English

  [Refereed]

  Scientific journal


• Lattice Boltzmann method for multiphase and multicomponent flows: A review

  Seta, Takeshi, Yamamoto, Keiichi, Yoshino, Masato, Takada, Naoki, Matsukuma, Yosuke, Yamamoto, Kazuhiro, Hayashi, Kosuke, Kimura, Hidehito, Tomiyama, Akio

  Abstract : The authors present the development of the lattice Boltzmann method (LBM) for application to gas-liquid flows, gas mixture, and gas-solid flows. The LBM scheme is constructed using a simple procedure that takes into account collision and propagation processes. The fluid density is calculated using the sum of the distribution function with respect to number of the discrete velocity. Since all distribution functions exist in the computational region with adequate boundary conditions, the LBM is effective for mass conservation and can be adjusted to the multiphase flow simulation. For the multiphase flow simulation, the color-gradient model is first proposed, and then the Shan-Chen and free energy models were implemented using the LBM. Then, the phase-field model, which is commonly used in LBMs, was investigated. The phase-field method easily captures the complicated interface and calculates multiphase flows with high density and viscosity ratios. For multicomponent flows, the LBM can calculate the Stefan--Maxwell equation. The present model calculates multicomponent phenomena, including uphill diffusion, without interpolating the distribution function. For particulate flows, we list the momentum exchange method and the immersed boundary -lattice Boltzmann method (IB-LBM) and explain the occurrence of boundary slip. Finally, we introduce models for wettability, including three phases: gas, liquid, and solid. Keywords : Lattice Boltzmann method, Multiphase flow, Multicomponent flow, Particulate flow, Wettability Cite this article : Seta, T.; Yamamoto, K.; Yoshino, M.; Takada, N.; Matsukuma, Y.; Yamamoto, K.; Hayashi, K.; Kimura, H.; Tomiyama, A. Lattice Boltzmann method for multiphase and multicomponent flows: A review. Muitiph. Sci. Technol. 2022, Vol. 34, in press. https://doi.org/10.1615/MultScienTechn.2022044039

  Begell House, Jul. 2022, Multiphase Science and Technology, 34, in press., English, International magazine

  [Refereed]

  Scientific journal


• Fragmentation of Drops Falling through a Miscible Liquid with and without Drop-Drop Interactions

  Rina Nakajima, Kosuke Hayashi

  Jul. 2022, International Journal of Multiphase Flow, 153, 104134, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Unilateral Approach for Bilateral Middle Cerebral Artery Aneurysms Assisted by Preoperative Understanding of Aneurysm Wall Properties: Two-Dimensional Operative Video

  Hidehito Kimura, Kosuke Hayashi, Susumu Osaki, Ayaka Shibano, Yuichi Fujita, Hiroaki Nagashima, Akio Tomiyama, Takashi Sasayama

  Elsevier BV, Jun. 2022, World Neurosurgery, 162, 42 - 42, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• EFFECTS OF SWIRL INTENSITY ON INTERFACIAL AND WALL FRICTION FACTORS OF ANNULAR FLOWS IN A VERTICAL PIPE

  Ryo Kurimoto, Ryoya Koto, Kosuke Hayashi, Akio Tomiyama

  May 2022, 2022 Japan-U.S. Seminar on Two-Phase Flow Dynamics, 1 - 6, English

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• A phase field-finite difference lattice Boltzmann method for modeling dendritic growth solidification in the presence of melt convection

  Roberto Rojas, Verónica Sotomayor, Tomohiro Takaki, Kosuke Hayashi, Akio Tomiyama

  Elsevier BV, May 2022, Computers & Mathematics with Applications, 114, 180 - 187, English

  [Refereed]

  Scientific journal


• An ANN Correlation of Lift Coefficients of Bubbles in Linear Shear Flows

  Kosuke Hayashi, Junming Chen, Ryo Kurimoto, Akio Tomiyama

  Begell House, Mar. 2022, Multiphase Science and Technology, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Single Contaminated Drops Falling through Stagnant Liquid at Low Reynolds Numbers

  Kosuke Hayashi, Yuya Motoki, Matheus J. A. van der Linden, Niels G. Deen, Shigeo Hosokawa, Akio Tomiyama

  Numerical simulations of contaminated spherical drops falling through a stagnant liquid at low Reynolds numbers are carried out using the finite difference method. The numerical results are used to describe the behavior of the surfactant concentrations and to understand the surfactant effects on the fluid motions in detail. The predicted interfacial surfactant concentration, Γ, is almost zero for angles, θ, below a certain value (the stagnant-cap angle, θcap), whereas it steeply increases and reaches a large value for θ>θcap (the stagnant-cap region). The increase in the initial surfactant concentration, C0, in the drop enhances the adsorption from the drop to the interface, which results in the increase in Γ and the decrease in θcap. Peaks appear in the predicted Marangoni stresses around θcap, which causes similar peaks in the pressure distribution. The high-pressure spots prevent the fluid motion along the interface, which results in the formation of the stagnant-cap region and the attenuation of the tangential velocity in the continuous phase. The surfactant flux from the bulk to the interface decreases C in the vicinity of the interface for θ<θcap and the weak diffusion cannot compensate for the reduction in C by adsorption, which results in C at the interface smaller than C0. The pattern of the low C region is determined by the advection and does not smear out because of a small diffusive flux.

  MDPI AG, Jan. 2022, Fluids, 7(2) (2), 55 - 55, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of Particle and Bubble Diameters on Removal Rate of Hydrophilic Fine Particles in Bubbly Flows

  Masatoshi Kawabata, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Begell House, Jan. 2022, Multiphase Science and Technology, English

  [Refereed]

  Scientific journal


• Effects of chemical absorption on mass transfer from single carbon dioxide bubbles in aqueous sodium hydroxide solution in a vertical pipe

  Devy Setiorini Sa'adiyah, Yuki Matsuo, Michael Schlüter, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Elsevier BV, Dec. 2021, Chemical Engineering Science, 245, 116852 - 116852, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Void Fraction and Interfacial Friction in Vertical Circular Pipes with the Square Top End under Flooding Conditions

  Toshiya Takaki, Michio Murase, Kosuke Hayashi, Akio Tomiyama

  Oct. 2021, Nuclear Technology, English

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Flow Characteristics in a Vertical Circular Pipe under Flooding in Its Inside

  Naoki SANO, Raito GODA, Kosuke HAYASHI, Michio MURASE, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Sep. 2021, JAPANESE JOURNAL OF MULTIPHASE FLOW, 35(4) (4), 533 - 542, Japanese

  [Refereed]

  Scientific journal


• Numerical Simulations of Flows in a Cerebral Aneurysm Using the Lattice Boltzmann Method with the Half-Way and Interpolated Bounce-Back Schemes

  Susumu Osaki, Kosuke Hayashi, Hidehito Kimura, Takeshi Seta, Takashi Sasayama, Akio Tomiyama

  Lattice Boltzmann simulations and a velocity measurement of flows in a cerebral aneurysm reconstructed from MRA (magnetic resonance angiography) images of an actual aneurysm were carried out and the numerical results obtained using the bounce-back schemes were compared with the experimental data to discuss the effects of the numerical treatment of the no-slip boundary condition of the complex boundary shape of the aneurysm on the predictions. The conclusions obtained are as follows: (1) measured data of the velocity in the aneurysm model useful for validation of numerical methods were obtained, (2) the numerical stability of the quadratic interpolated bounce-back scheme (QBB) in the flow simulation of the cerebral aneurysm is lower than those of the half-way bounce-back (HBB) and the linearly interpolated bounce-back (LBB) schemes, (3) the flow structures predicted using HBB and LBB are comparable and agree well with the experimental data, and (4) the fluctuations of the wall shear stress (WSS), i.e., the oscillatory shear index (OSI), can be well predicted even with the jaggy wall representation of HBB, whereas the magnitude of WSS predicted with HBB tends to be smaller than that with LBB.

  Corresponding, MDPI AG, Sep. 2021, Fluids, 6(10) (10), 338 - 338, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Scaling of Lift Reversal of Deformed Bubbles in Air-Water Systems

  Kosuke Hayashi, Hendrik Hessenkemper, Dirk Lucas, Dominique Legendre, Akio Tomiyama

  Lead, Elsevier BV, Sep. 2021, International Journal of Multiphase Flow, 142, 103653 - 103653, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of Water Levels in Upper Tank on Flow Characteristics in a Vertical Pipe under Flooding at Its Top End

  Toshiya TAKAKI, Raito GODA, Ryo KURIMOTO, Kosuke HAYASHI, Michio MURASE, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Aug. 2021, JAPANESE JOURNAL OF MULTIPHASE FLOW, 35(3) (3), 463 - 472, Japanese

  [Refereed]

  Scientific journal


• Newly Identified Hemodynamic Parameter to Predict Thin-Walled Regions of Unruptured Cerebral Aneurysms Using Computational Fluid Dynamics Analysis.

  Hidehito Kimura, Susumu Osaki, Kosuke Hayashi, Masaaki Taniguchi, Yuichi Fujita, Takeshi Seta, Akio Tomiyama, Takashi Sasayama, Eiji Kohmura

  BACKGROUND: The thin-walled regions (TIWRs) of intracranial aneurysms have a high risk of rupture during surgical manipulation. They have been reported to be predicted by wall shear stress and pressure (PS) based on computational fluid dynamics analysis, although this remains controversial. In this study, we investigated whether the oscillatory shear index (OSI) can predict TIWRs. METHODS: Twenty-five unruptured aneurysms were retrospectively analyzed; the position and orientation of the computational fluid dynamics color maps were adjusted to match the intraoperative micrographs. The red area on the aneurysm wall was defined as TIWR, and if most of the regions on the color map corresponding to TIWR were OSI low (lower quartile range), time-averaged wall shear stress (TAWSS) high, or PS high (upper quartile range), each region was defined as a matched region and divided by the total number of TIWRs to calculate the match rate. In addition, the mean values of OSI, TAWSS, and PS corresponding to TIWRs were quantitatively compared with those in adjacent thick-walled regions. RESULTS: Among 27 TIWRs of 25 aneurysms, 23, 10, and 14 regions had low OSI, high TAWSS, and high PS regions (match rate: 85.2%, 37.0%, and 51.9%), respectively. Receiver operating characteristic curve analysis demonstrated that OSI was the most effective hemodynamic parameter (area under the curve, 0.881), followed by TAWSS (0.798). Multivariate analysis showed that OSI was a significant independent predictor of TIWRs (odds ratio, 18.30 [95% CI, 3.2800-102.00], P < 0.001). CONCLUSIONS: OSI may be a unique predictor for TIWRs. Low OSI strongly corresponds with TIWRs of intracranial aneurysms.

  Aug. 2021, World neurosurgery, 152, e377-e386, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Flow Characteristics of Air-Water Two-Phase Flows in a Serpentine Tube

  Junichiro KAZI, Hitoshi MORI, Junpei FUKUMA, Kosuke HAYASHI, Ryo KURIMOTO, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Mar. 2021, JAPANESE JOURNAL OF MULTIPHASE FLOW, 35(1) (1), 85 - 92, Japanese

  [Refereed][Invited]

  Scientific journal


• Effects of fluid properties on interfacial and wall friction factors under counter-current flow limitation in a vertical pipe with sharp-edged lower end

  Raito Goda, Ryo Kurimoto, Kosuke Hayashi, Michio Murase, Akio Tomiyama

  Elsevier BV, Mar. 2021, Nuclear Engineering and Design, 373, 111020 - 111020, English

  [Refereed]

  Scientific journal


• GENERATION OF MICROBUBBLES BY SUBCOOLED BOILING OF WATER WITH DISSOLVED INCONDENSABLE GASES

  Yuegui Li, Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama, Naoki Shibata, Yasunari Maeda

  Begell House, 2021, Multiphase Science and Technology, 33(3) (3), 17 - 31, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Removal of sludge attached to the wall of a planar vessel due to bubble motion

  Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, 2021, Multiphase Science and Technology, 33(3) (3), 53 - 66, English

  [Refereed]

  Scientific journal


• Removal Rate of Hydrophobic Fine Particles in Bubbly Flow

  Masatoshi Kawabata, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, 2021, Multiphase Science and Technology, 33(4) (4), 1 - 13, English

  [Refereed]

  Scientific journal


• Flow characteristics in vertical circular pipes with the square top end under flooding conditions

  Toshiya Takaki, Raito Goda, Kosuke Hayashi, Michio Murase, Akio Tomiyama

  Elsevier BV, Jan. 2021, Nuclear Engineering and Design, 371, 110951 - 110951, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Spatial Evolution of CO2‐Contaminated Water Bubble Flows in a Vertical Pipe

  Devy Setiorini Sa'adiyah, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Wiley, Jan. 2021, Chemie Ingenieur Technik, 93(1-2) (1-2), 247 - 259, English

  [Refereed][Invited]

  Scientific journal


• EFFECTS OF INITIAL LIQUID HEIGHT ON TOTAL AND LOCAL GAS HOLDUPS IN AN AIR-WATER BUBBLE COLUMN

  Nobuya Kobayashi, Shun Adomi, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, 2021, Multiphase Science and Technology, 33(2) (2), 87 - 101, English

  [Refereed]

  Scientific journal


• CRITICAL DIAMETER FOR LIFT REVERSAL OF BUBBLES IN LINEAR SHEAR FLOWS

  Kosuke Hayashi, Dirk Lucas, D. Legendre, Akio Tomiyama

  Begell House, 2021, Multiphase Science and Technology, 33(2) (2), 69 - 85, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Flow Characteristics in a 3×3 Rod Bundle under Flooding Conditions

  Michio MURASE, Naoki SANO, Toshiya TAKAKI, Raito GODA, Kosuke HAYASHI, Akio TOMIYAMA

  The Japanese Society for Multiphase Flow, Nov. 2020, JAPANESE JOURNAL OF MULTIPHASE FLOW, 35(1) (1), 159 - 167, Japanese

  [Refereed]

  Scientific journal


• Pressure drops of air-water two-phase flows in horizontal U-bends

  Kosuke Hayashi, Junichiro Kazi, Naoyuki Yoshida, Akio Tomiyama

  Elsevier BV, Oct. 2020, International Journal of Multiphase Flow, 131, 103403 - 103403, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Lift Coefficients of Clean Ellipsoidal Bubbles in Linear Shear Flows

  Kosuke Hayashi, Dominique Legendre, Akio Tomiyama

  Lead, Elsevier BV, Aug. 2020, International Journal of Multiphase Flow, 129, 103350 - 103350, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Comparison of the Flow Structure in a Normal Triangular Tube Array Obtained Based on the SFV Technique and on a CFD Analysis

  Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

  Abstract This paper presents an analysis of the performance of the Spatial Filter Velocimetry (SFV) technique applied to external flows across tube bundles to evaluate the benefits of using low particle concentration in a complex geometry. The experimental vector velocity fields were obtained in a tube bundle test section made of acrylic with 20 rows of 4 tubes of 20mm O.D. mounted in a normal triangular configuration and transversal pitch per diameter ratio of 1.25. The SFV results reliability was evaluated by comparing the volumetric flow rates estimated by the experimental vector velocity fields with the volumetric flow rates measured by the flowmeter, showing good agreement. Additionally, the experimental results are used to check the validity of numerical results obtained through CFD simulation. The experiments were conducted for Reynolds numbers of 909, 1842 and 3902. The velocity profiles obtained through the SFV technique agree with the CFD simulations results, which indicate consistent results for both analyzes. Therefore, the numerical and experimental results indicate that the SFV technique provides accurate velocity data and is suitable to be applied to complex geometries, especially in regions away of the test section wall due to the good visibility provided by low particle concentration.

  American Society of Mechanical Engineers, Jul. 2020, ASME 2020 Fluids Engineering Division Summer Meeting (FEDSM2020), 1 - 12, English

  [Refereed]

  International conference proceedings


• Numerical Simulations of Flows in Cerebral Aneurysms Using the Lattice Boltzmann Method

  Susumu Osaki, Kosuke Hayashi, Hidehito Kimura, Eiji Kohmura, Akio Tomiyama

  Corresponding, Jul. 2020, ASME 2020 Fluids Engineering Division Summer Meeting, English

  [Refereed]

  International conference proceedings


• Effects of fine particles on terminal velocities of single bubbles in a narrow channel between parallel flat plates

  Masaaki Hashida, Kosuke Hayashi, Akio Tomiyama

  Elsevier BV, Jun. 2020, International Journal of Multiphase Flow, 127, 103270 - 103270, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Characterization of the Velocity Field External to a Tube Bundle Using Spatial Filter Velocimetry Based on Variable Meshing Scheme

  Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

  Springer Science and Business Media LLC, Apr. 2020, Flow, Turbulence and Combustion, 105, 1277 - 1301, English

  [Refereed]

  Scientific journal


• Pressure and shear stress analysis in a normal triangular tube bundle based on experimental flow velocity field

  Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

  Springer Science and Business Media LLC, Apr. 2020, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 42(4) (4), English

  [Refereed]

  Scientific journal


• Mass transfer from single carbon-dioxide bubbles in surfactant-electrolyte mixed aqueous solutions in vertical pipes

  Yohei Hori, Dieter Bothe, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Elsevier BV, Mar. 2020, International Journal of Multiphase Flow, 124, 103207 - 103207, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• EFFECTS OF FLUID PROPERTIES ON PRESSURE DROPS OF TWO-PHASE FLOWS IN HORIZONTAL U-BENDS

  Kosuke Hayashi, J. Kazi, N. Yoshida, Akio Tomiyama

  Begell House, 2020, Multiphase Science and Technology, 32(4) (4), 325 - 340, English

  [Refereed]

  Scientific journal


• BUBBLE TRACKING SIMULATIONS USING SIMPLE MODELS FOR FLUCTUATING BUBBLE MOTION

  Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Begell House, 2020, Multiphase Science and Technology, 32(3) (3), 221 - 236, English

  [Refereed]

  Scientific journal


• Application of Spatiotemporal Filter Velocimetry to Evaluation of Drag Force Acting on Single Drop

  Gaku Shigekane, Shigeo Hosokawa, Kosuke Hayashi; Akio Tomiyama

  Nov. 2019, 11th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF)

  [Refereed]

  International conference proceedings


• Experimental Study on Interfacial and Wall Friction Factors under Counter-Current Flow Limitation in Vertical Pipes with Sharp-Edged Lower Ends

  GODA RAITO, HAYASHI KOSUKE, MURASE MICHIO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Nov. 2019, Nuclear Engineering and Design, 353, 110223, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Drag Correlations of Ellipsoidal Bubbles in Clean and Fully-Contaminated Systems

  CHEN JUNMING, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Sep. 2019, Multiphase Science and Technology, 31(3) (3), 215 - 234, English

  [Refereed]

  Scientific journal


• Evaluation of Drag Force Acting on Single Contaminated Drop based on Velocity Distribution

  Gaku Shigekane, Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama

  Jul. 2019, AJK-Fluids, English

  [Refereed]

  International conference proceedings


• Combined effects of alcohol and electrolyte on mass transfer from single carbon-dioxide bubbles in vertical pipes

  Yohei Hori, Yutaka Hirota, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Elsevier BV, Jun. 2019, International Journal of Heat and Mass Transfer, 136, 521 - 530, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Viscous Stress and Pressure Acting on Interface of Contaminated Drop

  HOSOKAWA SHIGEO, SHIGEKANE GAKU, HAYASHI KOSUKE, TOMIYAMA AKIO

  May 2019, 10th International Conference on Multiphase Flow (ICMF2019), 2 pages, English

  [Refereed]

  International conference proceedings


• Numerical Simulations of Flows in Cerebral Aneurysms Using the Lattice Boltzmann Method with Single- and Multiple-Relaxation Time Collision Models

  OSAKI SUSUMU, HAYASHI KOSUKE, KIMURA HIDEHITO, SETA TAKESHI, KOHMURA EIJI, TOMIYAMA AKIO

  Corresponding, May 2019, Computers & Mathematics with Applications, 78, 2746 - 2760, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of Surfactant on Bubble Breakup at T-Junction and Characteristics of Taylor Flows in Mini and Micro Channels

  HAYASHI KOSUKE, SUZUKI DAIKI, KURIMOTO RYO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2019, 10th International Conference on Multiphase Flow (ICMF2019), 2 pages, English

  [Refereed]

  International conference proceedings


• Effects of Initial Liquid Height on Gas Holdup in an Air-Water Bubble Column

  KOBAYASHI NOBUYA, HASHIDA MASAAKI, HAYASHI KOSUKE, MARASHDEH QUSSAI, TOMIYAMA AKIO

  Begell House, May 2019, 10th International Conference on Multiphase Flow (ICMF2019), 33(2) (2), 6 pages - 101, English

  [Refereed]

  International conference proceedings


• Combined Effects of Surfactant and Electrolyte on Mass Transfer from Single Carbon-Dioxide Bubbles in Vertical Pipes

  HORI YOHEI, BOTHE DIETER, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2019, 10th International Conference on Multiphase Flow (ICMF2019), 9 pages, English

  [Refereed]

  International conference proceedings


• Characterization of Velocity Field External to Tube Bundle Using Spatial Filter Velocimetry based on Variable Meshing Scheme

  ROCHA DOUGLAS, KANIZAWA FABIO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, RIBATSKI GHERHARDT

  May 2019, 10th International Conference on Multiphase Flow (ICMF2019), 9 pages, English

  [Refereed]

  International conference proceedings


• Hydrodynamic Sound Generated by Bubble Collapse in Subcooled Liquid Flow

  HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Mar. 2019, Multiphase Science and Technology, 31(1) (1), 61 - 71, English

  [Refereed]

  Scientific journal


• Rise Velocities of Single Bubbles in a Narrow Channel between Parallel Flat Plates

  HASHIDA MASAAKI, HAYASHI KOSUKE, TOMIYAMA AKIO

  Feb. 2019, Internation Journal of Multiphase Flow, 111, 285 - 293, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Experiments on Removal of Hydrophilic Fine Particles in Bubbly Flow

  KAWABATA MASATOSHI, TSUKAGUCHI YUICHI, KANG JYUNGYU, HAYASHI KOSUKE, TOMIYAMA AKIO

  Feb. 2019, ISIJ International, 59(2) (2), 209 - 215, English

  [Refereed]

  Scientific journal


• Detection of Hemodynamic Characteristics Before Growth in Growing Cerebral Aneurysms by Analyzing Time-of-Flight Magnetic Resonance Angiography Images Alone: Preliminary Results.

  Hidehito Kimura, Kosuke Hayashi, Masaaki Taniguchi, Kohkichi Hosoda, Atsushi Fujita, Takeshi Seta, Akio Tomiyama, Eiji Kohmura

  OBJECTIVE: Cerebral aneurysm growth often precedes rupture. Definite contributors to aneurysm growth have not been determined even by means of recently developed commercially available computational fluid dynamics (CFD) software. We developed an original CFD tool that can analyze data from time-of-flight magnetic resonance angiography (TOF-MRA) before growth in the growing aneurysms and investigate possible factors for aneurysm growth in the near future. METHODS: We retrospectively reviewed unruptured aneurysms that were treated at our institute because of aneurysm growth (growing group) between April 2013 and March 2017. Stable aneurysms that had demonstrated no growth for more than 5 years were selected (stable group). TOF-MRA data of these aneurysms were retrospectively converted to 3-dimensional vessel geometric data; 3 hemodynamic indices including streamline, wall shear stress (WSS), and oscillatory shear index were calculated by our original CFD tool using the lattice Boltzmann method to quantitatively compare the 2 groups. RESULTS: Six growing aneurysms and 6 stable aneurysms were analyzed. Of the 6 growing aneurysms, WSS on the focal aneurysmal sac increased temporally in the vicinity of the constant low WSS area at the peak systolic phase. By contrast, WSS did not increase during any part of the cardiac cycle in 3 of the 6 stable aneurysms. The peak values of WSS were significantly different between the 2 groups. CONCLUSIONS: A focal increase in WSS in the peak systolic phase may be a risk factor for aneurysm enlargement in the near future.

  Feb. 2019, World neurosurgery, 122, e1439-e1448 - e1448, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Clear Detection of Thin-Walled Regions in Unruptured Cerebral Aneurysms by Using Computational Fluid Dynamics.

  Hidehito Kimura, Masaaki Taniguchi, Kosuke Hayashi, Yosuke Fujimoto, Youichi Fujita, Takashi Sasayama, Akio Tomiyama, Eiji Kohmura

  OBJECTIVE: Thin-walled regions (TIWRs) within cerebral aneurysms have a high risk of rupture during surgical manipulation. Previous reports have demonstrated specific changes in the parameters of computational fluid dynamics in TIWRs; however, they have not been fully evaluated. We identified and investigated a novel parameter, wall shear stress vector cycle variation (WSSVV), with user-friendly software that could predict TIWRs. METHODS: Twelve unruptured cerebral aneurysms were analyzed. TIWRs were defined as reddish areas compared with the normal-colored parent artery on intraoperative views. The position and orientation of these clinical images were adjusted to match the WSSVV color maps. TIWRs and thick-walled regions (TKWRs) were marked and compared with the corresponding regions on WSSVV maps. The default images obtained from WSSVV imaging required appropriate maximum color bar value (MCBV) adjustment for predicting TIWRs. Sensitivity and specificity analyses were performed by changing the MCBV from 300 to 700 at intervals of 100. With the optimal MCBV, the WSSVV values were quantitatively compared. RESULTS: All of the selected 18 TIWRs and 16 TKWRs corresponded to low- and high-value regions of the WSSVV color maps at the adjusted MCBV, respectively. The mean optimal MCBV was 483.3 ± 167.50 (range, 300-700). According to receiver operating characteristic analysis, the best MCBV for predicting TIWRs was 500 (highest sensitivity, 0.89; specificity, 0.94). Under this condition, the quantitative values of the computational fluid dynamics color maps for TIWRs and TKWRs were significantly different (P < 0.01). CONCLUSIONS: Low WSSVV values may indicate TIWRs within cerebral aneurysms.

  Jan. 2019, World neurosurgery, 121, e287-e295 - e295, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Investigation of Bubble Shape and Flow Filed of Gas–Liquid Slug Flow in Circular Microchannels

  KURIMOTO RYO, HAYASHI KOSUKE, MINAGAWA HISATO, TOMIYAMA AKIO

  Elsevier BV, Dec. 2018, International Journal of Heat and Fluid Flow, 74, 28 - 35, English

  [Refereed]

  Scientific journal


• Shapes of single bubbles in infinite stagnant liquids contaminated with surfactant

  Shohei Aoyama, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Elsevier Inc., Sep. 2018, Experimental Thermal and Fluid Science, 96, 460 - 469, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Evaluation of Adsorption of Surfactant at a Moving Interface of a Single Spherical Drop

  HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  Elsevier, Sep. 2018, Experimental Thermal and Fluid Science, 96, 397 - 405, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• On CCFL at a PWR Hot-Leg Pipe Geometry and Comparison Between Results in COLLIDER 1/4th- and Kobe 1/15th-Scaled Facilities

  AL ISSA SULEIMAN, MURASE MICHIO, TOMIYAMA AKIO, HAYASHI KOSUKE, MACIAN-JUAN RAFAEL

  Aug. 2018, Nuclear Science and Engineering, 193, 147 - 159, English

  [Refereed][Invited]

  Scientific journal


• Diagnostics of flow about a contaminated single drop using spatiotemporal filter velocimetry

  HOSOKAWA SHIGEO, SHIGEKANE GAKU, HAYASHI KOSUKE, TOMIYAMA AKIO

  Jul. 2018, 19th Symposium on Applications of Laser and Imaging Techniques to Fluid Mechanics, Lisbon 2016, English

  [Refereed]

  International conference proceedings


• Interfacial and wall friction factors of swirling annular flow in a vertical pipe

  H. Funahashi, K. Vierow Kirkland, K. Hayashi, S. Hosokawa, A. Tomiyama

  Elsevier Ltd, Apr. 2018, Nuclear Engineering and Design, 330, 97 - 105, English

  [Refereed]

  Scientific journal


• Wall and Interfacial Shear Stress of Swirling Annular Flow

  FUNAHASHI HAYATO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Apr. 2018, 8th European-Japanese Twp-Phase Flow Group Meeting, EJTPFGM-8, 1, English

  [Refereed]

  International conference proceedings


• Numerical Simulation of a Drop in Contaminated Systems from low concentration to CMC

  HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Apr. 2018, 8th European-Japanese Twp-Phase Flow Group Meeting, EJTPFGM-8, 1, English

  [Refereed]

  International conference proceedings


• Analytical and numerical studies of the boundary slip in the immersed boundary-thermal lattice Boltzmann method

  Takashi Seta, Kosuke Hayashi, Akio Tomiyama

  John Wiley and Sons Ltd, Mar. 2018, International Journal for Numerical Methods in Fluids, 86(7) (7), 454 - 490, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Semi-empirical correlation for counter-current flow limitation at the upper or lower end of sharp-edged vertical pipes

  Raito Goda, Kosuke Hayashi, Karen Vierow Kirkland, Michio Murase, Akio Tomiyama

  Elsevier Ltd, Mar. 2018, Nuclear Engineering and Design, 328, 182 - 187, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of Surfactant on Lift Coefficients of Bubbles in Linear Shear Flows

  HAYASHI KOSUKE, TOMIYAMA AKIO

  Feb. 2018, International Journal of Multiphase Flow, 99, 86 - 93, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of azimuthal angle of aeration hole and liquid viscosity on flows inside and outside an air diffuser pipe

  Ryo Sato, Kosuke Hayashi, Akio Tomiyama

  Society of Chemical Engineers, Japan, 2018, Kagaku Kogaku Ronbunshu, 44(1) (1), 59 - 66, Japanese

  [Refereed]

  Scientific journal


• Mass transfer from single carbon-dioxide bubbles in electrolyte aqueous solutions in vertical pipes

  Yohei Hori, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Dec. 2017, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 115, 663 - 671, English

  [Refereed]

  Scientific journal


• Experimental evaluation of Marangoni stress and surfactant concentration at interface of contaminated single spherical drop using spatiotemporal filter velocimetry

  Shigeo Hosokawa, Yuya Masukura, Kosuke Hayashi, Akio Tomiyama

  Elsevier Ltd, Dec. 2017, International Journal of Multiphase Flow, 97, 157 - 167, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Evaluation of Adsorption of Surfactant at a Drop Interface using Spatiotemporal Filter Velocimetry

  HOSOKAWA SHIGEO, OKAMOTO RYOTA, HAYASHI KOSUKE, TOMIYAMA AKIO

  Dec. 2017, 10th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF2017), English

  [Refereed]

  International conference proceedings


• Effects of azimuthal angle of aeration hole on flows inside and outside an air diffuser pipe

  Ryo Sato, Tatsuya Miyayoshi, Kosuke Hayashi, Akio Tomiyama

  Dec. 2017, EXPERIMENTAL THERMAL AND FLUID SCIENCE, 89, 90 - 97, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Spatiotemporal Flow Structure of Counter-Current Two-Phase Annular Flows

  GODA RAITO, KATSUYA MORI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Nov. 2017, ANS Winter Meeting and Nuclear Technology Expo, 2 pages, English

  [Refereed]

  International conference proceedings


• Lift force acting on single bubbles in linear shear flows

  S. Aoyama, K. Hayashi, S. Hosokawa, D. Lucas, A. Tomiyama

  Nov. 2017, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 96, 113 - 122, English

  [Refereed]

  Scientific journal


• Prevention of Settlement of Cyprids to the Bottom of a Spherical Surface by Small-Bubbles Flow

  MIMURA HARUO, KOTA SHIODA, KOSUKE HAYASHI, AKIO TOMIYAMA

  A round-shaped flask fixed in a fish tank was continuously covered by small bubbles. The number of barnacles grew on the lower hemisphere was 35 to 45 individuals when small bubbles were supplied for 30 days. When bubbles were not supplied, 664 individuals settled on the area. Small bubbles with diameters of 51 to 100 μm showed the highest frequency around the lower hemisphere

  the Society of Sea Water Science, Japan, Oct. 2017, Bulletin of the Society of Sea Water Science, Japan, 71(5) (5), 315 - 320, Japanese

  [Refereed]

  Scientific journal


• Improvement of separator performance with modified pick-off ring and swirler

  H. Funahashi, K. Hayashi, S. Hosokawa, A. Tomiyama

  Oct. 2017, NUCLEAR ENGINEERING AND DESIGN, 322, 360 - 367, English

  [Refereed]

  Scientific journal


• On CCFL in Collider Test Facility: CCFL Results at PWR Hot-Leg Pipe Geometry with 190 mm Diameter

  AL ISSA SULEIMAN, MURASE MICHIO, TOMIYAMA AKIO, HAYASHI KOSUKE, MACIAN-JUAN RAFAEL

  Sep. 2017, 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics(NURETH-17), 14 pages, English

  [Refereed]

  International conference proceedings


• 鉛直管内での気液対向流に対する界面摩擦係数

  KUSUNOKI KIYOSHI, YAMAMOTO YASUNORI, MURASE MICHIO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  One-region computations with the annular flow model were done for counter-current flow limitation (CCFL) at the sharp-edged lower end of vertical pipes to evaluate effects of diameters and fluid properties on CCFL characteristics. CCFL characteristics computed with several correlations for interfacial friction factors were compared with CCFL data and the correlation proposed by Bharathan et al. (which is a function of void fraction) was selected. The adjustment factors were obtained to give good agreement between CCFL characteristics computed with the correlation by Bharathan et al. and CCFL data and were correlated with the viscosity ratio of gas and liquid phases and the dimensionless diameter. By using the correlation for interfacial friction factors by Bharathan et al. modified with the viscosity ratio of gas and liquid phases and the dimensionless diameter, effects of diameters and fluid properties on CCFL characteristics were computed.

  THE JAPANESE SOCIETY FOR MULTIPHASE FLOW, Jun. 2017, 混相流, 31(1) (1), 37 - 46, Japanese

  [Refereed]

  Scientific journal


• 鉛直管での気液対向流制限に対する流体物性の影響

  MURASE MICHIO, KUSUNOKI KIYOSHI, YAMAMOTO YASUNORI, GODA RAITO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  To evaluate effects of the diameter on countercurrent flow limitation (CCFL) in vertical pipes, in our previous study, we classified CCFL into CCFL-L at the sharp-edged lower end, CCFL-U at the sharp-edged upper end, and CCFL-P inside the vertical pipe with round-edged upper and lower ends, and we found that the characteristic length in the Wallis parameter, w = D^(1-β)L^β (where D and L respectively denote the diameter and the Laplace capillary length), is respectively β = 0, 1 and β ≈ 0.5 for CCFL-L, CCFL-U and CCFL-P. In this study, we evaluated effects of fluid properties on CCFL in vertical pipes by using existing CCFL data. The most effective fluid properties is the liquid viscosity and we selected the viscosity ratio of gas and liquid (μ_G/μ_L) as a dimensionless parameter. From effects of μ_G/μ_L on the slope m and constant C in the Wallis correlation, we classified three regions of large positive interrelations of m and C with μ_G/μ_L for small μ_L (room-temperature to high-temperature water), small interrelations of m and C with μ_G/μ_L for medium μ_L (low-concentration glycerol water solution), and the large negative interrelation of m with μ_G/μ_L for large μ_L (high-concentration glycerol water solution). We obtained exponent functions of μ_G/μ_L for m and C in the case of the small μ_L (room-temperature to high-temperature water) for CCFL-L and CCFL-U except CCFL-P without high-temperature CCFL data.

  THE JAPANESE SOCIETY FOR MULTIPHASE FLOW, Jun. 2017, 混相流, 31(2) (2), 152 - 161, Japanese

  [Refereed]

  Scientific journal


• Terminal Velocities of Single Bubble Rising through Stagnant Liquids and Slurry in a Hele-Shaw Cell

  HASHIDA MASAAKI, HAYASHI KOSUKE, TOMIYAMA AKIO

  Jun. 2017, 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamic (ExHFT-9), 9 pages, English

  [Refereed]

  International conference proceedings


• Pressure Drop in Air-Water Two-Phase Flows in Horizontal U-Bends

  HAYASHI KOSUKE, SUZUKI DAIKI, MIYACHI NAOTO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Jun. 2017, 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamic (ExHFT-9), 8 pages, English

  [Refereed]

  International conference proceedings


• Evaluation of Adsorption of Surfactant at a Moving Interface of a Single Spherical Drop

  HOSOKAWA SHIGEO, OKAMOTO RYOTA, HAYASHI KOSUKE, TOMIYAMA AKIO

  Jun. 2017, 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamic (ExHFT-9), 10 pages, English

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• Mass transfer from single carbon dioxide bubbles in alcohol aqueous solutions in vertical pipes

  Jiro Aoki, Yohei Hori, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  May 2017, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 108(Part B) (Part B), 1991 - 2001, English

  [Refereed]

  Scientific journal


• Effects of electrolyte on mass transfer from single carbon-dioxide bubbles in vertical pipes

  HORI YOHEI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2017, Third International Symposium on Multiscale Multiphase Process Engineering (MMPE2017), 6 pages, English

  [Refereed]

  International conference proceedings


• Experimental Investigation of Temperature Distribution in Condensing Steam-Air Flow in a Circular Tube

  MORI KATSUYA, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, UTANOHARA YOICHI, YAMAMOTO YASUNORI, MURASE MICHIO

  Apr. 2017, 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017), English

  [Refereed]

  International conference proceedings


• Effects of column diameter and liquid height on gas holdup in air-water bubble columns

  Shohei Sasaki, Kengo Uchida, Kosuke Hayashi, Akio Tomiyama

  Apr. 2017, EXPERIMENTAL THERMAL AND FLUID SCIENCE, 82, 359 - 366, English

  [Refereed]

  Scientific journal


• Interfacial Friction Factor for Counter-Current Gas-Liquid Flows in Vertical Pipes

  KUSUNOKI TAKAYOSHI, YAMAMOTO YASUNORI, MURASE MICHIO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  日本混相流学会, Mar. 2017, 混相流, 31(1) (1), 37 - 46, Japanese

  [Refereed]

  Scientific journal


• Lift force acting on single bubbles in linear shear flows

  S. Aoyama, K. Hayashi, S. Hosokawa, D. Lucas, A. Tomiyama

  Elsevier Ltd, 2017, International Journal of Multiphase Flow, 96, 113 - 122, English

  [Refereed]

  Scientific journal


• 鉛直管内における気液対向流制限

  YAMAMOTO YASUNORI, MURASE MICHIO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Characteristics of counter-current flow limitation (CCFL) inside vertical pipes with sharp-edged upper end (CCFL-P/SE) and with round-edged upper and lower ends (CCFL-P) were evaluated to clarify the dependence of the limiting locations. The CCFL is defined by the relationship between the gas and liquid volumetric fluxes (J_G and J_L) under a quasi-steady state after onset of flooding. CCFL correlations were constructed for CCFL-P/SE and CCFL-P based on the previous experimental data. The correlations were compared to the characteristics of CCFL at the vertical pipes of the sharp-edged upper end (CCFL-U) and the sharp-edged lower end (CCFL-L). CCFL-P has the highest liquid volumetric flux when CCFL occurs, and the lowest is CCFL-L. For the Wallis correlation, selection of the characteristic length of w = D^(1-β)L^β (where D and L respectively denote the diameter and the Laplace capillary length) is quite important. Our results have indicated that CCFL-P/SE and CCFL-P are also expressed by β ≈ 0.5, CCFL-U is expressed by β = 1, and CCFL-L is expressed by β = 0.

  THE JAPANESE SOCIETY FOR MULTIPHASE FLOW, Dec. 2016, 混相流, 30(4) (4), 392 - 401, Japanese

  [Refereed]

  Scientific journal


• Study on two-phase swirling flows in a gas-liquid separator with three pick-off rings

  H. Funahashi, K. Hayashi, S. Hosokawa, A. Tomiyama

  Nov. 2016, NUCLEAR ENGINEERING AND DESIGN, 308, 205 - 213, English

  [Refereed]

  Scientific journal


• A Semi-Empirical Correlation for Counter-Current Flow Limitation in a Vertical Pipe

  MORI KATSUYA, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Nov. 2016, ANS Conference 2016 Winter Meeting and Nuclear Technology Expo, 3 pages, English

  [Refereed]

  International conference proceedings


• Effects of Particle Concentration and Slurry Height on Gas Holdup in a Slurry Bubble Column

  Shohei Sasaki, Kengo Uchida, Kosuke Hayashi, Akio Tomiyama

  Sep. 2016, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 49(9) (9), 824 - 830, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Surfactant Concentration at an Interface of Single Spherical Drop

  HAYASHI KOSUKE, MASUKURA YUYA, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2016, 9th International Conference on Multiphase Flow, No. 262, 6 pages, English

  [Refereed]

  International conference proceedings


• Mass Transfer from Single Carbon Dioxide Bubbles in Water-Alchol Solutions in a Verical Pipe

  HORI YOHEI, AOKI JIRO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2016, 9th International Conference on Multiphase Flow, No. 245, 6 pages, English

  [Refereed]

  International conference proceedings


• Experimental Evaluation of Surfacant Concentration at an Interface of Single Spherical Drop

  HOSOKAWA SHIGEO, MASUKURA YUYA, HAYASHI KOSUKE, TOMIYAMA AKIO

  May 2016, 9th International Conference on Multiphase Flow, No. 262, 6 pages, English

  [Refereed]

  International conference proceedings


• Effects of Azimuthal Angle of Aeration Holes on Flows inside and outside a Bubble Diffuser Pipe

  SATO RYO, MIYAYOSHI TATSUYA, HAYASHI KOSUKE, TOMIYAMA AKIO

  May 2016, 9th International Conference on Multiphase Flow, No. 168, 6 pages, English

  [Refereed]

  International conference proceedings


• Condensation experiments for counter-current flow limitation in an inverted U-tube

  Takayoshi Kusunoki, Takahiro Nozue, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Michio Murase

  Apr. 2016, JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 53(4) (4), 486 - 495, English

  [Refereed]

  Scientific journal


• Effects of liquid height on gas holdup in air-water bubble column

  Shohei Sasaki, Kosuke Hayashi, Akio Tomiyama

  Apr. 2016, EXPERIMENTAL THERMAL AND FLUID SCIENCE, 72, 67 - 74, English

  [Refereed]

  Scientific journal


• Shapes of ellipsoidal bubbles in infinite stagnant liquids

  S. Aoyama, K. Hayashi, S. Hosokawa, A. Tomiyama

  Mar. 2016, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 79, 23 - 30, English

  [Refereed]

  Scientific journal


• Effects of Liquid-Separation Components on Separation Performance of a Steam Separator

  KATONO KENICHI, TAMARU HAYATO, HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  Dec. 2015, Japanese journal of Multiphase Flow, 29(4) (4), 343 - 350, Japanese

  [Refereed]

  Scientific journal


• Two-Phase Swirling Flow in a Gas-Liquid Separator

  FUNAHASHI HAYATO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Nov. 2015, ANS Conference 2015 Winter Meeting and Nuclear Technology Expo, 2 pages, English

  [Refereed]

  International conference proceedings


• Effects of Surfactants on Mass Transfer from Single Carbon Dioxide Bubbles in Vertical Pipes

  Jiro Aoki, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Nov. 2015, CHEMICAL ENGINEERING & TECHNOLOGY, 38(11) (11), 1955 - 1964, English

  [Refereed][Invited]

  Scientific journal


• Evaluation of Interfacial Shear Stress of Single Drop Using Spatiotemporal Filter Velocimetry

  HOSOKAWA SHIGEO, MASUKURA Yuya, HAYASHI KOSUKE, TOMIYAMA AKIO

  Oct. 2015, 7th European-Japanese Two-Phase Flow Group Meeting, 3 pages, English

  [Refereed]

  International conference proceedings


• Effects of liquid viscosity on flows inside and outside a bubble diffuser pipe

  Ryo Sato, Kosuke Hayashi, Akio Tomiyama

  Sep. 2015, EXPERIMENTAL THERMAL AND FLUID SCIENCE, 66, 197 - 205, English

  [Refereed]

  Scientific journal


• Effects of Liquid Height on Gas Holdup in a Rectangular Bubble Column

  SASAKI SHOHEI, HAYASHI KOSUKE, TOMIYAMA AKIO

  Sep. 2015, 9th International Symposium on Measurement Techniques for Multiphase Flow, 2 pages, English

  [Refereed]

  International conference proceedings


• Motion of Contaminated Drops Falling onto Flat Plate

  HAYASHI KOSUKE, KITANO MASAAKI, DHAR ABHINAV, TOMIYAMA AKIO

  Jul. 2015, ASME-JSME-KSME Joint Fluids Engineering Conference 2015 (AJK2015-FED), AJK2015 - 21048, 2 pages, English

  [Refereed]

  International conference proceedings


• Effects of fluid properties on CCFL characteristics at a vertical pipe lower end

  Takayoshi Kusunoki, Michio Murase, Yuki Fujii, Takahiro Nozue, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Jun. 2015, JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 52(6) (6), 887 - 896, English

  [Refereed]

  Scientific journal


• Implicit Temperature-Correction-based Immersed-Boundary Thermal Lattice-Boltzmann Method with Two Relaxation Times

  SETA TAKESHI, HAYASHI KOSUKE, TOMIYAMA AKIO

  In the present paper, we verify the effectiveness of the two-relaxation-time (TRT) collision operator in reducing boundary slip of temperature computed by the immersed boundary-thermal lattice Boltzmann method (IB-TLBM). In the linear collision operator of the TRT, we decompose the distribution function into symmetric and antisymmetric components and define the relaxation parameters for each part. The Chapman-Enskog expansion indicates that one relaxation time for the antisymmetric component is related to the thermal conductivity. We derive the theoretical relation between a temperature slip at the boundary and reveal that the relaxation time for the symmetric part controls the temperature at the boundary and boundary slip of temperature computed by the IB-TLBM. We apply the IB-TLBM based on the implicit correction method with two relaxation times for the natural convection in a square enclosure containing a circular cylinder. The streamline, isotherms, and average Nusselt number calculated by the proposed method agree well with those of previous numerical studies.

  The Japan Society of Mechanical Engineers, May 2015, 23th International Conference on Nuclear Engineering (ICONE23), 2015(23) (23), 10 pages, ICONE23 - 1039, English

  [Refereed]

  International conference proceedings


• Mass transfer from single carbon dioxide bubbles in contaminated water in a vertical pipe

  Jiro Aoki, Kosuke Hayashi, Akio Tomiyama

  Apr. 2015, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 83, 652 - 658, English

  [Refereed]

  Scientific journal


• Effects of Particle Diameter on Bubble Coalescence in a Slurry Bubble Column

  Shimpei Ojima, Shohei Sasaki, Kosuke Hayashi, Akio Tomiyama

  Mar. 2015, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 48(3) (3), 181 - 189, English

  [Refereed]

  Scientific journal


• Assessment of numerical treatments in interface capturing simulations for surface-tension-driven interface motion

  Abhinav Dhar, Naoki Shimada, Kosuke Hayashi, Akio Tomiyama

  Multi-Science Publishing Co. Ltd, Mar. 2015, Journal of Computational Multiphase Flows, 7(1) (1), 15 - 32, English

  [Refereed]

  Scientific journal


• Effects of subcooling on sound generation by vapor bubbles in water

  Kosuke Hayashi, Masaya Tateyama, Kazutaka Ikeuchi, Shigeo Hosokawa, Akio Tomiyama, Makoto Hirotsu, Nobuhiro Takeda

  Begell House Inc., 2015, Multiphase Science and Technology, 27(1) (1), 67 - 75, English

  [Refereed]

  Scientific journal


• Distributions of void fraction and liquid velocity in air-water bubble column

  Shimpei Ojima, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Dec. 2014, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 67, 111 - 121, English

  [Refereed]

  Scientific journal


• CCFL of Steam-Condensate Two-Phase Flow in a U-Tube

  NOZUE TAKAHIRO, FUJII YUKI, MURASE MICHIO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Nov. 2014, ANS Conference 2014 Winter Meeting and Nuclear Technology Expo, CD-ROM, 2 pages, English

  [Refereed]

  International conference proceedings


• Effects of Surfactant on Mass Transfer from Single Carbon Dioxide Bubbles in Vertical Pipes

  AOKI JIRO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Sep. 2014, Proc. 2nd International Symposium on Multiscale Multiphase Process Engineering, pp. 94 - 99, English

  [Refereed]

  International conference proceedings


• Effects of Height-To-Diameter Ratio on Gas Holdup in a Slurry Bubble Column

  SASAKI SHOHEI, OJIMA SHIMPEI, HAYASHI KOSUKE, TOMIYAMA AKIO

  Sep. 2014, Proc. 2nd International Symposium on Multiscale Multiphase Process Engineering, pp. 230 - 235, English

  [Refereed]

  International conference proceedings


• An Interface Capturing Scheme for Free-Surface Flows in a Flow Channel Consisting of Solid Obstacles

  SHIMADA NAOKI, DHAR ABHINAV, HAYASHI KOSUKE, TOMIYAMA AKIO

  Sep. 2014, Proc. 2nd International Symposium on Multiscale Multiphase Process Engineering, pp. 106 - 115, English

  [Refereed]

  International conference proceedings


• Bubble Growth in Microgravity under the Action of Electric Forces: Experiments and Numerical Simulation

  DI MARCO PAOLO, KURIMOTO RYO, SACCONE GIACOMO, HAYASHI KOSUKE, TOMIYAMA AKIO

  Aug. 2014, Proc. 15th International Heat Transfer Conference, IHTC-15, IHTC15 - 08960, 11 pages, English

  [Refereed]

  International conference proceedings


• Numerical Simulations of Clean and Contaminated Bubbles in Linear Shear Flows

  HAYASHI KOSUKE, AOYAMA SHOHEI, TOMIYAMA AKIO

  Jul. 2014, International Conference on Numerical Methods for Multiphase Flow 2014, ICNMMF2014, 2 pages, English

  [Refereed]

  International conference proceedings


• Evaluation of Interfacial Shear Stress of Single Drop using Spatiotemporal Filter Velocimetry

  HOSOKAWA SHIGEO, KITAHATA KYOSUKE, HAYASHI Kosuke, TOMIYAMA AKIO

  Jul. 2014, 17th International Symposium on Applications of Laser Techniques to Fluid Mechamics (LISBON 2014), English

  [Refereed]

  International conference proceedings


• Effects of numerical treatment of viscous and surface tension forces on predicted motion of interface

  K. Hayashi, A. Tomiyama

  Multi-Science Publishing Co. Ltd, Jun. 2014, Journal of Computational Multiphase Flows, 6(2) (2), 111 - 126, English

  [Refereed]

  Scientific journal


• Void distribution and bubble motion in bubbly flows in a 4×4 rod bundle. Part II: numerical simulation

  HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Lead, Feb. 2014, Journal of Nuclear Science and Technology, 51(5) (5), 580 - 589, English

  [Refereed]

  Scientific journal


• Void distribution and bubble motion in bubbly flows in a 4 x 4 rod bundle. Part I: Experiments

  Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama

  Feb. 2014, JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 51(2) (2), 220 - 230, English

  [Refereed]

  Scientific journal


• Implicit-correction-based immersed boundary-lattice Boltzmann method with two relaxation times

  Takeshi Seta, Roberto Rojas, Kosuke Hayashi, Akio Tomiyama

  Feb. 2014, PHYSICAL REVIEW E, 89(2) (2), 023307, English

  [Refereed]

  Scientific journal


• Effects of shape oscillation on mass transfer from a Taylor bubble

  Kosuke Hayashi, Shogo Hosoda, Gretar Tryggvason, Akio Tomiyama

  Lead, Jan. 2014, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 58, 236 - 245, English

  [Refereed]

  Scientific journal


• Effects of hydrophilic particles on bubbly flow in slurry bubble column

  Shimpei Ojima, Kosuke Hayashi, Akio Tomiyama

  Jan. 2014, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 58, 154 - 167, English

  [Refereed]

  Scientific journal


• An Interface-Capturing Method for Free-Surface Flows in a Flow Channel Consisting of Solid Obstacles

  Abhinav Dhar, Naoki Shimada, Kosuke Hayashi, Akio Tomiyama

  2014, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 47(3) (3), 230 - 240, English

  [Refereed]

  Scientific journal


• MASS TRANSFER FROM SINGLE CARBON DIOXIDE BUBBLES IN CONTAMINATED WATER

  Jiro Aoki, Kosuke Hayashi, Shogo Hosoda, Shigeo Hosokawa, Akio Tomiyama

  2014, ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING - 2014, VOL 1D: SYMPOSIA, FEDSM2014 - 21103, 8 pages, English

  [Refereed]

  International conference proceedings


• Permeation of concentrated oil-in-water emulsions through a membrane pore: numerical simulation using a coupled level set and the volume-of-fluid method

  Yusuke Kagawa, Toru Ishigami, Kosuke Hayashi, Hiromi Fuse, Yasushi Mino, Hideto Matsuyama

  2014, SOFT MATTER, 10(40) (40), 7985 - 7992, English

  [Refereed]

  Scientific journal


• Effects of inlet condition on flow structure of bubbly flow in a rectangular column

  Mohd Hatta bin Mohd Akbar, Kosuke Hayashi, Dirk Lucas, Akio Tomiyama

  Dec. 2013, CHEMICAL ENGINEERING SCIENCE, 104, 166 - 176, English

  [Refereed]

  Scientific journal


• Immersed Boundary-Finite Difference Lattice Boltzmann Method Using Two Relaxation Times

  ROJAS, Roberto, SETA, Takeshi, HAYASHI KOSUKE, TOMIYAMA AKIO

  Immersed boundary-lattice Boltzmann methods (IB-LBM) with the single-relaxation time (SRT) cause non-physical distortion in fluid velocity when the Reynolds number is low, i.e. the relaxation time τ is high, and IB-LBM requires high spatial resolution to stably simulate high Reynolds number flows. An immersed boundary-finite difference lattice Boltzmann method (IB-FDLBM) using two-relaxation times (TRT) is therefore proposed in this study to simulate low and high Reynolds number flows stably and accurately. Benchmark problems such as circular Couette flows, flows past a circular cylinder and a sphere at various Reynolds numbers are carried out for validation. The main conclusions obtained are as follows: (1) TRT reduces numerical errors causing non-physical distortion in the fluid velocity at low Reynolds numbers, and accurate predictions are obtained when the parameter Λ, which is a function of the two relaxation times, is low, (2) for stable simulation the parameter Λ should be decreased as the Reynolds number increases, (3) implementation of TRT and the implicit direct forcing method into IB-FDLBM can solve two problems in simulation of low Reynolds number flows, i.e. non-physical velocity distortion and non-physical penetration of flow into the solid body, and (4) IB-FDLBM with TRT gives good predictions of the drag coefficients of a circular cylinder and a sphere in uniform flows for a wide range of the Reynolds number, Re, i.e., 0.1 ≤ Re ≤ 1x10⁴.

  JSME, Sep. 2013, Journal of Fluid Science and Technology, 8(3) (3), 262 - 276, English

  [Refereed]

  Scientific journal


• Gas-Liquid Two-Phase Flows Inside and Outside an Air Diffuser Pipe

  HAYASHI KOSUKE, TOMIYAMA AKIO

  Sep. 2013, 9th UK - Japan Seminar on Multi-Phase Flow, Japanese

  [Refereed]

  International conference proceedings


• Distribution of Void Fraction and Liquid Velocity in Air-Water Bubble Column

  OJIMA Shinpei, HOSOKAWA SHIGEO, HAYASHI Kosuke, TOMIYAMA Akio

  Sep. 2013, 9th UK-Japan Seminar on Multi-Phase Flow, English

  [Refereed]

  International conference proceedings


• Bubble shape under the action of electric forces

  Paolo Di Marco, Ryo Kurimoto, Giacomo Saccone, Kosuke Hayashi, Akio Tomiyama

  Sep. 2013, Experimental Thermal and Fluid Science, 49, 160 - 168, English

  [Refereed]

  Scientific journal


• Effects of Inlet Condition on Flow Structure of Bubbly Flow in Rectangular Column

  Mohd Hatta, bin Mohd, Akbar, HAYASHI KOSUKE, TOMIYAMA AKIO, LUCAS, Dirk

  Jun. 2013, 8th World Conference on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics (ExHFT8), USB memory, 8 pages, English

  [Refereed]

  International conference proceedings


• Void Distribution and Bubble Motion in Bubbly Flows in a 4 X 4 Rod Bundle

  HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  May 2013, 15th International Topical Meeting on Nuclear Reactor Thermal - Hydraulics, NURETH-15, NURETH15 - 244, USB memory, 12 pages, English

  [Refereed]

  International conference proceedings


• NUMERICAL SIMULATION OF BUBBLY FLOWS IN A 4 X 4 ROD BUNDLE USING A MULTI-FLUID MODEL

  HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2013, 15th International Topical Meeting on Nuclear Reactor Thermal - Hydraulics, NURETH-15, NURETH15 - 245, USB memory, 12 pages, English

  [Refereed]

  International conference proceedings


• Mass Transfer from Single Carbon Dioxide Bubbles in Glycerol-Water Solution

  AOKI JIRO, HOSODA SHOGO, HAYASHI KOSUKE, TOMIYAMA AKIO, HOSOKAWA SHIGEO

  May 2013, 8th International Conference on Multiphase Flow, ICMF2013, ICMF2013 - 229, USB memory, 9 pages, English

  [Refereed]

  International conference proceedings


• Effects of Shape Oscillation on Mass Transfer from a Taylor Bubble

  HOSODA SHOGO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2013, 8th International Conference on Multiphase Flow, ICMF2013, ICMF2013 - 286, USB memory, 8 pages, English

  [Refereed]

  International conference proceedings


• Effects of Hydrophilic Particles on Bubble Coalescence in Slurry Bubble Column

  OJIMA SHIMPEI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  May 2013, 8th International Conference on Multiphase Flow, ICMF2013, ICMF2013 - 157, USB memory, 13 pages, English

  [Refereed]

  International conference proceedings


• Terminal velocities of clean and fully-contaminated drops in vertical pipes

  Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Mar. 2013, International Journal of Multiphase Flow, 49, 8 - 23, English

  [Refereed]

  Scientific journal


• Numerical simulation of flows about a stationary and a free-falling cylinder using immersed boundary-finite difference lattice boltzmann method

  Roberto Rojas, Kosuke Hayashi, Takeshi Seta, Akio Tomiyama

  Multi-Science Publishing, Mar. 2013, Journal of Computational Multiphase Flows, 5(1) (1), 27 - 41, English

  [Refereed]

  Scientific journal


• NUMERICAL ANALYSIS OF THERMAL-HYDRAULICS BY IMMERSED BOUNDARY-LATTICE BOLTZMANN METHOD USING TWO-RELAXATION-TIME

  SETA, Takeshi, UCHIDA, Yosuke, ROJAS, Roberto, HAYASHI, Kosuke, TOMIYAMA, Akio

  Dec. 2012, 計算数理工学論文集, Vol. 12, pp. 37-42, Japanese

  [Refereed]

  Scientific journal


• Numerical analysis of thermal-hydraulics by immersed boundary-lattice Boltzmann method using two-relaxation-time

  SETA, Takeshi, UCHIDA, Yosuke, ROJAS, Roberto, HAYASHI, Kosuke, TOMIYAMA, Akio

  日本計算数理工学会, Dec. 2012, ICOME2012/JASCOME2012, 12, 37 - 42, Japanese

  International conference proceedings


• IMMERSED BOUNDARY-FINITE DIFFERENCE LATTICE BOLTZMANN METHOD USING TWO RELAXATION TIMES

  ROJAS, Roberto, SETA, Takeshi, HAYASHI, Kosuke, TOMIYAMA, Akio

  Immersed boundary-lattice Boltzmann methods (IB-LBM) with the single-relaxation time (SRT) cause non-physical distortion in fluid velocity when the Reynolds number is low, i.e. the relaxation time τ is high, and IB-LBM requires high spatial resolution to stably simulate high Reynolds number flows. An immersed boundary-finite difference lattice Boltzmann method (IB-FDLBM) using two-relaxation times (TRT) is therefore proposed in this study to simulate low and high Reynolds number flows stably and accurately. Benchmark problems such as circular Couette flows, flows past a circular cylinder and a sphere at various Reynolds numbers are carried out for validation. The main conclusions obtained are as follows: (1) TRT reduces numerical errors causing non-physical distortion in the fluid velocity at low Reynolds numbers, and accurate predictions are obtained when the parameter Λ, which is a function of the two relaxation times, is low, (2) for stable simulation the parameter Λ should be decreased as the Reynolds number increases, (3) implementation of TRT and the implicit direct forcing method into IB-FDLBM can solve two problems in simulation of low Reynolds number flows, i.e. non-physical velocity distortion and non-physical penetration of flow into the solid body, and (4) IB-FDLBM with TRT gives good predictions of the drag coefficients of a circular cylinder and a sphere in uniform flows for a wide range of the Reynolds number, Re, i.e., 0.1 ≤ Re ≤ 1x10⁴.

  The Japan Society of Mechanical Engineers, Dec. 2012, 9th International Conference on CFD in the Minerals and Process Industries,, CD-ROM, 6 pages(3) (3), 262 - 276, English

  [Refereed]

  International conference proceedings


• EFFECTS OF NUMERICAL TREATMENT OF VISCOUS AND SURFACE TENSION FORCES ON PREDICTED INTERFACE MOTION

  HAYASHI, Kosuke, TOMIYAMA, Akio

  Dec. 2012, 9th International Conference on CFD in the Minerals and Process Industries,, CD-ROM, 6 pages

  [Refereed]

  International conference proceedings


• Interface Tracking Simulation of Bubbles in Clean and Contaminated Systems

  HAYASHI, Kosuke, TOMIYAMA, Akio

  Nov. 2012, Korea-Japan CFD Workshop 2012,, 8 pages

  International conference proceedings


• BUBBLE TRACKING SIMULATION OF BUBBLE-INDUCED PSEUDO TURBULENCE

  Mohd Hatta, bin Mohd, Akbar, Hayashi, Kosuke, Hosokawa, Shigeo, TOMIYAMA, Akio

  Sep. 2012, 6th Japanese-European Two-Phase Flow Group Meeting, USB memory, 10 pages

  [Refereed]

  International conference proceedings


• Effects of swirler shape on swirling annular flow in a gas-liquid separator

  Toshiki Matsubayashi, Kenichi Katono, Kosuke Hayashi, Akio Tomiyama

  Aug. 2012, NUCLEAR ENGINEERING AND DESIGN, 249, 63 - 70, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Mass Transfer From a Taylor Bubble with Shape Oscillation

  HOSODA, Shogo, HAYASHI Kosuke, HOSOKAWA, Shigeo, TOMIYAMA, Akio

  Jun. 2012, International Conference on Numerical Methods in Multiphase Flows, No. 7-1

  International conference proceedings


• Immersed boundary-lattice boltzmann method using two relaxation times

  Kosuke Hayashi, Roberto Rojas, Takeshi Seta, Akio Tomiyama

  Jun. 2012, Journal of Computational Multiphase Flows, 4(2) (2), 193 - 209, English

  [Refereed]

  Scientific journal


• EFFECTS OF SURFACTANT ON THE MOTION OF BUBBLES IN LINEAR SHEAR FLOWS

  HAYASHI, Kosuke, KURIMOTO, Ryo, HOSOKAWA, Shigeo, TOMIYAMA, Akio

  Jun. 2012, 2012 Japan-U.S. seminar on Two-Phase flow Dynamics, USB memory, 10 pages

  International conference proceedings


• Study on Flows inside and outside an Air Diffuser for Membrane Bioreactor

  KIRA, Fumihiro, FURUNO, Shinsuke, HAYASHI Kosuke, SAMPEI, Tomoyuki, TOMIYAMA, Akio

  Effects of the total gas flow rate on the water level in a diffuser pipe for a membrane bioreactor, the gas flow rate from each aeration hole and the bubble diameter are investigated. The diffuser has evenly positioned five aeration holes on the top and a larger hole on the bottom for introducing the liquid into the pipe. The gas flow rate from each aeration hole is measured by capturing generated bubbles. The water level and gas velocity inside the diffuser are computed by processing video images. The bubble diameter is calculated using the gas flow rate and the bubble generation frequency measured from the video images. The conclusions obtained are as follows: (1) the gas flow rate from the aeration hole depends on the water level inside the diffuser and becomes constant for all the holes as the total gas flow rate increases since the high total gas flow rate make the water level uniform, which results in a constant gas pressure in the diffuser, (2) the onset of slugging in the diffuser is well correlated in terms of the local gas velocity and the Mishima-Ishii's slugging model, (3) the increase in the total gas flow rate decreases the water level, causing suppression of the onset of slugging, (4) the diameter of aeration hole strongly affects the gas flow rate from each aeration hole and water level, and (5) the Davidson-Schuler correlation gives reasonable estimations of the bubble diameter, provided that the influence of slugging is not significant.

  The Japan Society of Mechanical Engineers, Apr. 2012, Journal of Fluid Science and Technology, Vol. 7, No. 1, pp. 78-88(1) (1), 78 - 88, English

  [Refereed]

  Scientific journal


• Mixing of thermally stratified water layer by a free rising wobbling air bubble

  Iztok Zun, Matjaz Perpar, Jurij Gregorc, Kosuke Hayashi, Akio Tomiyama

  Apr. 2012, CHEMICAL ENGINEERING SCIENCE, 72, 155 - 171, English

  [Refereed]

  Scientific journal


• Interface Tracking Simulation of Mass Transfer from a Dissolving Bubble

  HAYASHI Kosuke, TOMIYAMA Akio

  Mar. 2012, Journal of Computational Multiphase Flows, 3(4), 247-261

  [Refereed]

  Scientific journal


• Effects of surfactant on terminal velocity of a Taylor bubble in a vertical pipe

  Kosuke Hayashi, Akio Tomiyama

  Mar. 2012, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 39, 78 - 87, English

  [Refereed]

  Scientific journal


• Countercurrent Flow Limitation at the Junction between the Surge Line and the Pressurizer of a PWR

  Taiga Doi, Takashi Futatsugi, Michio Murase, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  2012, SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS, No. NURETH14-057, CD-ROM (12 p, English

  [Refereed]

  Scientific journal


• Countercurrent Flow Limitation at the Junction between the Surge Line and the Pressurizer of a PWR

  Taiga Doi, Takashi Futatsugi, Michio Murase, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  2012, SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS, Vol. 2012, 754724, 10 pages, English

  [Refereed]

  Scientific journal


• Bubble tracking simulation of bubble-induced pseudoturbulence

  Mohd Hatta Bin Mohd Akbar, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  Begell house, 2012, Multiphase Science and Technology, 24(3) (3), 197 - 222, English

  [Refereed]

  Scientific journal


• Immersed Boundary-Finite Difference Lattice Boltzmann Method for Liquid-Solid Two-Phase Flows

  ROJAS Roberto, SETA Takeshi, HAYASHI Kosuke, TOMIYAMA Akio

  An immersed boundary method based on a finite difference lattice Boltzmann method (IB-FDLBM) is presented. The FDLBM solves the discrete Boltzmann equation including an additional collision term by using finite difference schemes. The additional term works as a negative viscosity in the macroscopic level and allows us to alter the fluid viscosity while keeping the other relevant parameters of the simulation fixed. The immersed boundary method employs a direct-forcing method, which utilizes external forces at Lagrangian points embedded on immersed boundaries to impose the no-slip boundary condition. Several benchmark simulations are carried out to validate the developed method, i.e., flows past a circular cylinder, a falling particle, and interaction between two falling particles. Couette flows between a stationary and a rotating cylinder are also simulated at various values of the relaxation time for collision. The main conclusions obtained are as follows: (1) steady flows past a stationary circular cylinder are well predicted, (2) the motions of particles falling through liquids predicted using IB-FDLBM quantitatively agree well with those obtained using immersed boundary methods based on the lattice Boltzmann equation (IB-LBM), (3) the developed method well predicts the interaction between two particles falling through a liquid, e.g., the drafting-kissing-tumbling motion, and (4) distortion of velocity fields in circular Couette flows at high relaxation times is removed by the additional collision term.

  The Japan Society of Mechanical Engineers, Dec. 2011, Journal of Fluid Science and Technology, 6(6), 1051-1064(6) (6), 1051 - 1064, English

  [Refereed]

  Scientific journal


• Multiscale Simulation of Dispersed Flow in Bubble Columns

  TOMIYAMA Akio, OJIMA Shinpei, HAYASHI Kosuke, HOSOKAWA Shigeo

  Oct. 2011, Proc. of 1st International Symposium on Multiscale Multiphase Process Engineering (MMPE), CD-ROM (6 pages)

  International conference proceedings


• Mass transfer from a dissolving carbon dioxide bubble in glycerol-water solution

  HOSODA, Shogo, HAYASHI Kosuke, TOMIYAMA Akio

  Sep. 2011, International Conference on Advanced Technology in Experimental Mechanics 2011

  International conference proceedings


• Assessment of turbulence models for bubbly flow in a bubble column

  SATO, Hiroyasu, Mohd Hatta Bin Mohd, Akbar, HAYASHI, Kosuke, TOMIYAMA Akio

  Sep. 2011, International Conference on Advanced Technology in Experimental Mechanics 2011

  International conference proceedings


• Interface tracking and multi-fluid simulation of bubbly flows in bubble columns

  TOMIYAMA Akio, HAYASHI Kosuke

  Jun. 2011, 8th International Conference on COMPUTATIONAL FLUID DYNAMICS in the Oil & Gas, Metallurgical and Process Industries

  International conference proceedings


• Interface tracking simulation of dissolving bubbles and of contaminated bubbles and drops

  TOMIYAMA Akio, HAYASHI Kosuke

  May 2011, 49th European Two-Phase Flow Group Meeting

  International conference proceedings


• Terminal velocity of a Taylor drop in a vertical pipe

  K. Hayashi, R. Kurimoto, A. Tomiyama

  Apr. 2011, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 37(3) (3), 241 - 251, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• MASS TRANSFER FROM A BUBBLE IN A VERTICAL PIPE

  Shogo Hosoda, Ryosuke Sakata, Kosuke Hayashi, Akio Tomiyama

  2011, PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011, VOL 1 PTS A AND B, AJTEC2011-44089, 9 pages, 1363 - +, English

  [Refereed]

  International conference proceedings


• Numerical simulation of bubbles contaminated with soluble surfactant

  Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, 1(D) (D), 1641 - 1650, English

  [Refereed]

  International conference proceedings


• Interface tracking simulation of mass transfer from a dissolving bubble

  Kosuke Hayashi, Akio Tomiyama

  2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, 1(D) (D), 1593 - 1601, English

  [Refereed]

  International conference proceedings


• Numerical verification of a simplified model for vapor bubble lift-off from a hydrophilic heated flat-wall

  Tomio Okawa, Kosuke Hayashi, Akio Tomiyama

  Dec. 2010, NUCLEAR ENGINEERING AND DESIGN, 240(12) (12), 3942 - 3948, English

  [Refereed]

  Scientific journal


• 鉛直円管内旋回気液二相流の流動様式に関する研究

  SHAKUTSUI Hideaki, HAYASHI Kosuke, SUZUKI Takayuki

  This paper investigates flow patterns encountered in two-phase swirling flow in a vertical pipe. Flows in the pipe are observed by using a high-speed video camera and the void fractions are calculated from the video images. Flows at various gas and liquid volumetric fluxes, J_G and J_L, are tested, i.e., 0.01 ≤ J_G ≤ 8 m/s and 0.10 ≤ J_L ≤ 0.80 m/s. When J_L is higher than a certain value, no bubbles exist in a swirling flow but a gas column forms due to the centrifugal force even at low J_G. The diameter of a gas column increases with J_G at a constant J_L. A tornado-shaped gas column forms at intermediate J_G. At high J_G, a liquid film including small bubbles and intermittent liquid slugs with many bubbles are observed. These flows are classified into four flow patterns based on the observations and the characteristics of void fraction. The statistical quantities of void fraction, i.e., the mean, standard deviation, skewness and kurtosis, are also computed. The validity of the flow pattern classification based on the statistical quantities has been confirmed.

  THE JAPANESE SOCIETY FOR MULTIPHASE FLOW, Sep. 2010, Japanese Journal of Multiphase Flow, Vol. 24, No. 3, pp. 305-312(3) (3), 305 - 312, Japanese

  [Refereed]

  Scientific journal


• Interface Tracking simulation of mass transfer from a dissolving bubble in a vertical pipe

  HAYASHI Kosuke, TOMIYAMA Akio

  Sep. 2010, 8th Japan-UK Seminar on Multiphase Flows

  International conference proceedings


• Agitation of thermally stratified water layer by free rising wobbling air bubble

  ZUN Iztok, PERPAR Matjaz, GREGORC Jurij, HAYASHI Kosuke, TOMIYAMA Akio

  Jun. 2010, 48th European Two-Phase Flow Group Meeting 2010, ETPFGM'10

  International conference proceedings


• Terminal velocity of a Taylor drop in a vertical pipe

  HAYASHI Kosuke, Ryo Kurimoto, TOMIYAMA Akio

  May 2010, Proc. of 7th International Conference on Multiphase Flow, ICMF2010, 13 pages

  [Refereed]

  International conference proceedings


• Terminal velocity of a single drop in a vertical pipe in clean and fully-contaminated systems

  KURIMOTO Ryo, HAYASHI Kosuke, TOMIYAMA Akio

  May 2010, Proc. of International Conference on Multiphase Flow, ICMF2010, 11 pages

  [Refereed]

  International conference proceedings


• LES-Based Bubble Tracking Simulation of Turbulent Cavitation Flow in Injector Nozzle

  SOU Akira, GOSHIMA Daisuke, KINUGASA Tomoyuki, HAYASHI Kosuke, TOMIYAMA Akio

  May 2010, Proceedings of 7th International Conference on Multiphase Flow, No. 2-1-2, English

  [Refereed]

  International conference proceedings


• Pressure Drops in Gas-Liquid Two-Phase Flow in a Rod Bundle with Partial Length Rods

  OHTA, Motoki, HOSOKAWA, Shigeo, HAYASHI, Kosuke, TOMIYAMA, Akio

  Mar. 2010, Japanese Journal of Multiphase Flow, Vol. 23, No. 5, pp. 547-554, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Study on interface tracking method based on unstructured grid

  CHO, Masakazu, HAYASHI, Kosuke, SHAKUTSUI, Hideaki

  神戸市立工業高等専門学校, Mar. 2010, Research reports of Kobe city college of technology, No. 48, pp. 45-50(48) (48), 45 - 50, Japanese

  [Refereed]

  Scientific journal


• Study on decompression of floatation thickening of activated sludge

  OKU Tomiaki, MIYAAKE Daiki, SAWAI Masakazu, HAYASHI Kosuke, SUZUKI Takayuki, SHAKUTSUI Hideaki

  Mar. 2010, 神戸高専研究紀要, 49, Japanese

  [Refereed]

  Scientific journal


• T字形エルボによるキャビテーション壊食対策に関する研究

  NAEKI, Shinya, SHIBATA, Takahiro, HAYASHI, Kosuke, SUZUKI, Takayuki, SHAKUTSUI, Hideaki

  神戸市立工業高等専門学校, Mar. 2010, Research reports of Kobe city college of technology, No. 48, pp. 39-44(48) (48), 39 - 44, Japanese

  [Refereed]

  Scientific journal


• Interface tracking simulation of drops rising through liquids in a vertical pipe using three coordinate systems

  Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Mar. 2010, Journal of Computational Multiphase Flows, 2(1) (1), 47 - 57, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Bubble Coalescence in a Slurry Bubble Column

  OBATA Satoshi, OJIMA Shinpei, HAYASHI Kosuke, TOMIYAMA Akio

  2010, The 8th Japan-UK Seminar on Multiphase Flow

  International conference proceedings


• An Evolving Numerical Method for Designing Slurry Bubble Column Reactors

  Masahiro Tanaka, Kosuke Hayashi, Akio Tomiyama

  2010, KAGAKU KOGAKU RONBUNSHU, 36(1) (1), 17 - 24, Japanese

  [Refereed]

  Scientific journal


• Dimensional analysis of terminal velocity of a Taylor bubble in a vertical pipe

  Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  2010, Multiphase Science and Technology, 22(3) (3), 197 - 210, English

  [Refereed]

  International conference proceedings


• Numerical Simulation of Poly-Dispersed Bubbly Flows in Bubble Columns using a Multi-Fluid Model

  TANAKA, Masahiro, HAYASHI, Kosuke, TOMIYAMA, Akio

  Bubble coalescence and breakup models are implemented into the (N+2)-field model, which is a hybrid combination of a multi-fluid model and an interface tracking method to examine the applicability of available bubble coalescence and breakup models to poly-dispersed bubbly flows in bubble columns. The implemented models are a breakup model proposed by Luo & Svendsen and coalescence models proposed by Prince & Blanch and Wang et al. The validation of these models is carried out using experimental data for a coalescence-dominating flow, a breakup-dominating flow, a flow in-between, and a flow with low coalescence-breakup frequencies. Good predictions of void and bubble size distributions for the four kinds of poly-dispersed bubbly flows in bubble columns are obtained. It is also demonstrated that all the possible bubble coalescence mechanisms, i.e. bubble coalescence caused by bubble collisions due to turbulent eddies, the difference in bubble velocities and shear slip, and bubble coalescence due to wake entrainment, should be taken into account for obtaining good predictions.

  The Japan Society of Mechanical Engineers, Nov. 2009, Transaction of the Japanese Society of Mechanical Engineers, 75-759, pp.2182-2189(759) (759), 2182 - 2189, Japanese

  [Refereed]

  Scientific journal


• Numerical Simulation of Bubble Motion about a Grid Spacer in a Rod Bundle

  ZHANG Zheng, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

  Numerical simulations based on a three-dimensional two-way bubble tracking method are carried out to predict bubble motions in a square duct with an obstacle and in a two-by-three rod bundle with a grid spacer. Comparisons between measured and predicted bubble motions demonstrate that the two-way bubble tracking method gives good predictions for trajectories of small bubbles in the upstream side of the grid spacer in the rod bundle geometry. The predicted bubble trajectories clearly show that bubbles are apt to migrate toward the rod surface in the vicinity of the bottom of the grid spacer. Analysis of forces acting on the bubbles confirms that pressure gradient force induced by the presence of the spacer is the main cause of the bubble lateral migration toward the rod surface. Motions of steam bubbles at a nominal operating condition of a pressurized water reactor (PWR) are also predicted by using the bubble tracking method, which indicates that steam bubbles also migrate toward the rod surface at the upstream side of the spacer due to the spacer-induced pressure gradient force.

  The Japan Society of Mechanical Engineers, Sep. 2009, Journal of Power and Energy Systems, Vol. 3, No. 2, pp. 393 - 404(2) (2), 393 - 404, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Dissolution of Carbon Dioxide Bubbles in Clean and Contaminated Systems

  TOMIYAMA, Akio, ABE, Satoru, HAYASHI, Kosuke, HOSOKAWA, Shigeo

  Sep. 2009, 5th EuropeanTwo-Phase Flow Group Meeting, CD-ROM, 9 pages, English

  [Refereed]

  International conference proceedings


• Dimensional Analysis of Terminal Velocityof a Taylor Bubble in a Vertical Pipe

  HAYASHI Kosuke, KURIMOTO Ryo, TOMIYAMA Akio

  Sep. 2009, 5th EuropeanTwo-Phase Flow Group Meeting, CD-ROM, 6 pages, English

  [Refereed]

  International conference proceedings


• A drag correlation of fluid particles rising through stagnant liquids in vertical pipes at intermediate Reynolds numbers

  K. Hayashi, A. Tomiyama

  Jun. 2009, CHEMICAL ENGINEERING SCIENCE, 64(12) (12), 3019 - 3028, English

  [Refereed]

  Scientific journal


• Reduction of frictional pressure drop in micro bubble flow in a horizontal pipe

  HOSHINO, Takeshi, AOTA, Koichi, HAYASHI, Kosuke, SHAKUTSUI, Hideaki

  神戸市立工業高等専門学校, Mar. 2009, Research reports of Kobe city college of technology, No. 47, pp. 13-18(47) (47), 13 - 18, Japanese

  [Refereed]

  Scientific journal


• Flow pattern of swirling gas-liquid two-phase flow in a vertical pipe and a flow-pattern identification method

  TAKAGAKI, Shintaro, HONMA, Naoki, HAYASHI, Kosuke, SHAKUTSUI, Hideaki

  神戸市立工業高等専門学校, Mar. 2009, Research reports of Kobe city college of technology, No. 47, pp. 19-24(47) (47), 19 - 24, Japanese

  [Refereed]

  Scientific journal


• Hybrid multiphase-flow simulation of bubble-driven flow in complex geometry using an immersed boundary approach

  Masahiro Tanaka, Kosuke Hayashi, Akio Tomiyama

  Begell House Inc., 2009, Multiphase Science and Technology, 21(1-2) (1-2), 141 - 155, English

  [Refereed]

  Scientific journal


• Single Drops Rising Through Stagnant Liquids in a Vertical Pipe

  HAYASHI Kosuke, YOSHIKAWA Yasuki, SOU Akira, TOMIYAMA Akio

  Jul. 2008, Proc. 5th International Conference on Transport Phenomena in Multiphase Systems, CD-ROM, English

  [Refereed]

  International conference proceedings


• Flow characteristics of cavitating flow in a T-shape elbow

  MATSUOKA, Takashi, UZAKI, Yuma, HAYASHI, Kosuke, SHAKTSUI, Hideaki, KIKUTANI, Isao

  Water is more liable to evaporate than oils since its saturated vapor pressure is higher than the ones of oils. Therefore it is important to prevent erosion due to cavity in hydraulic devices using water. In our previous study, we reported that erosion at elbow of pipeline can be reduced by using T-shape elbow. However its mechanism has not been clarified yet. In the present study, we observed cavitating flows in T-shape elbows with different shapes using a digital and high-speed video cameras. The amount of cavity was evaluated from taking images. As a result we confirmed that (1) circulating flow is steadily formed when the length of cavity-trapping region L ≥ 22.5 mm. If L ≤ 15 mm, circulating flow is formed intermittently, or it is not formed, (2) The amount of cavity in cavity-trapping region increases with L, and (3)there are two uses (a) T-shape elbows can be used to guide cavity into the region, in which circulating flow is formed, for defending the downstream of pipeline, and (b) Then the elbows can also be used to guide bubbles to the downstream so as to prevent erosion at the elbows.

  Kobe City College of Technology, Mar. 2008, Research reports of Kobe city college of technology, No. 46, pp. 13-18, 13 - 18, Japanese

  [Refereed]

  Scientific journal


• A Numericsl Study on the Mechanism of Vapor Bubble Lift-off from a Flat Plate

  OKAWA Tomio, HAYASHI Kosuke, TOMIYAMA Akio

  2008, Proc. 6th Japan-Korea Symp. Nuclear Thermal Hydraulics and Safety, CD-ROM, pp.1-8, English

  [Refereed]

  International conference proceedings


• Qualitative Validity of Volume Tracking Simulation of Bubble Motion with Low Spatial Resolution

  HAYASHI Kosuke, SOU Akira, TOMIYAMA Akio

  The number of computational cells assigned to a small bubble is liable to be small in a volume tracking simulation of a poly-dispersed bubbly flow. The volume tracking method is, therefore, expected to at least give qualitatively reasonable predictions of bubble motion without assigning many cells. In this study, bubble motions in stagnant water and shear flows are simulated with low spatial resolutions using a volume tracking method proposed in our previous study. As a result, we confirm that (1) the method can yield correct characteristics of rising velocity and lateral motion of bubbles, and (2) the bubble volume and interface sharpness are kept well even after a bubble had experienced a large deformation in a strong shear flow.

  The Japan Society of Mechanical Engineers, Dec. 2007, Journal of Fluid Science and Technology, Vol. 2, No. 2, pp. 490-501(2) (2), 490 - 501, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Interface tracking simulation of bubbles and drops in complex geometries

  Kosuke Hayashi, Akio Tomiyama

  2007, Multiphase Science and Technology, 19(2) (2), 121 - 140, English

  [Refereed]

  Scientific journal


• Numerical simulation of single drops in a vertical pipe using various coordinate systems

  Keishun Hirokawa, Kosuke Hayashi, Akira Sou, Akio Tomiyama, Naoki Takada

  2007, FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B, CD-ROM, FEDSM2007-37491, 291 - 296, English

  [Refereed]

  International conference proceedings


• Qualitative Validity of Volume Tracking Simulation of Bubble Motion with Low Spatial Resolution

  HAYASHI Kosuke, SOU Akira, TOMIYAMA Akio

  The number of computational cells assigned to a small bubble is liable to be small in a volume tracking simulation of a poly-dispersed bubbly flow. The volume tracking method is, therefore, expected to at least give qualitatively reasonable predictions of bubble motion without assigning many cells. In this study, bubble motions in stagnant water and shear flows were simulated with low spatial resolutions using a volume tracking method proposed in our previous study. As a result, we confirmed that (1) the method could yield correct characteristics of rising velocity and lateral motion of bubbles, and (2) the bubble volume and interface sharpness were kept well even after a bubble had experienced a large deformation in a strong shear flow.

  The Japan Society of Mechanical Engineers, Oct. 2006, 日本機械学会論文集, Vol. 72, No. 722, (B), pp. 241(722) (722), 2410 - 2417, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Application of Cahn-Hilliard Equation to the Evaluation of Surface Tension Force

  HAYASHI Kosuke, TAKADA Naoki, TOMIYAMA Akio

  Sep. 2006, Japanese Journal of Multiphase Flow, 20巻3号, pp.244-251, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Interface Tracking Simulation of Bubbles and Drops in Complex Geometries

  HAYASHI, Kosuke, TOMIYAMA, Akio

  Sep. 2006, 4th Japanese-European Two-Phase Flow Group Meeting, CD-ROM (8 pages)

  [Refereed]

  International conference proceedings


• A Volume Tracking Method Based on Non-Uniform Subcells and Continuum Surface Force Model Using a Local Level Set Function

  HAYASHI Kosuke, SOU Akira, TOMIYAMA Akio

  Jul. 2006, Computational Fluid Dynamics Journal, Vol. 15, Iss. 2, pp. 225-232, English

  [Refereed]

  Scientific journal


• Modeling and hybrid simulation of bubbly flow

  A. Tomiyama, K. Sakoda, K. Hayashi, A. Sou, N. Shimada, S. Hosokawa

  2006, Multiphase Science and Technology, 18(1) (1), 73 - 110, English

  [Refereed]

  Scientific journal


• Toward Hybrid Simulation of Bubbly Flow (Invited Lecture)

  TOMIYAMA Akio, SAKODA Kenichi, HAYASHI Kosuke

  Sep. 2005, Proc. Int. Minisymposium on Challenger and Adavances in Flow SImulation and Modeling, p.276, English

  International conference proceedings


• A volume tracking method based on Advanced Subgrid Counting Algorithm

  Kosuke Hayashi, Win Myint, Akira Sou, Akio Tomiyama

  2005, Proceedings of the ASME Fluids Engineering Division Summer Conference, Vol 2, CD-ROM, FEDSM2005-77396, 265 - 270, English

  [Refereed]

  International conference proceedings


• Modelong and Hybrid Simulation of Bubbly Flow(Keynote Lecture)

  TOMIYAMA Akio, SAKODA Kenichi, HAYASHI Kosuke, SOU Akira, SHIMADA Naoki, HOSOKAWA Shigeo

  2004, Proc.6th US-Japan Seminar on Two-Phase Flow Dynamics, 1,1-16, English

  [Refereed]

  International conference proceedings


• A volume tracking method for multi-phase flow simulation: Improvement of an interface reconstruction method

  Akira Sou, Kosuke Hayashi, Akio Tomiyama

  Japan Society of Mechanical Engineers, 2004, Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 70(698) (698), 2538 - 2544, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Evaluation of Volume Tracking Algorithms for Gas-Liquid Two-Phase Flows.

  SOU Akira, HAYASHI Kosuke, NAKAJIMA Tsuyoshi

  Jul. 2003, Proc. 4th ASMER-JSME Joint Fluids Engineering Conf., CD-ROM, English

  [Refereed]

  International conference proceedings


• Numerical analysis of methanol droplet combustion in hot air flow

  A Sou, K Hayashi, JY Chen

  2003, COMBUSTION SCIENCE AND TECHNOLOGY IN ASIA-PACIFIC AREA: TODAY AND TOMORROW, Paper No.071, 509 - 512, English

  [Refereed]

  International conference proceedings


• Numerical analysis of ignition and combustion of a deformable droplet

  Akira Sou, Toyoshige Tagawa, Kosuke Hayashi, Tsuyoshi Nakajima

  2002, International Symposium on Combustion Abstracts of Works-in-Progress Posters, 397, English

  International conference proceedings

• Report on the 41th Lecture Series on Numerical Simulations of Multiphase Flows

  林 公祐

  日本混相流学会, Sep. 2016, 混相流 = Japanese journal of multiphase flow, 30(3) (3), 327 - 329, Japanese


• B224 Effects of liquid-separation components on two-phase swirling flow in a steam separator

  KATONO Kenichi, FUNAHASHI Hayato, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

  A downscaled model of a steam separator is used to understand characteristics of swirling flow from the viewpoint of the effects of flow restriction ring (FRR) which is installed in a drainage channel. Main conclusions obtained are as follows. (1) Carryunder performance, the weight percentage of entrained gas in the water leaving the separator, improves by narrowing the flow area in the drainage channel using the FRR because it becomes hard to exhaust the gas. On the other hand, (2) the ratio of the separated flow rate to the liquid flow rate may decrease because the liquid phase climbing over the 1st pick-off ring and scattered droplets increase. Therefore, (3) it is necessary to optimize the FRR design based on the gas-liquid separation performance and pressure-loss performance.

  The Japan Society of Mechanical Engineers, 07 Jun. 2015, National Symposium on Power and Energy Systems, 2015(20) (20), 239 - 240, Japanese


• 時空間フィルタ流速計による単一液滴に作用する界面せん断応力の評価

  HOSOKAWA SHIGEO, KITAHATA KYOSUKE, HAYASHI KOSUKE, TOMIYAMA AKIO

  日本流体力学会, Dec. 2014, ながれ, 33(6) (6), 509 - 512, Japanese

  [Refereed][Invited]

  Report scientific journal


• GS35 Reduction of the Velocity Slips by the Immersed Boundary-Lattice Boltzmann Method

  SETA Takeshi, ROJAS Roberto, HAYASHI Kosuke, TOMIYAMA Akio

  We verify the effectiveness of the two-relaxation-time (TRT) collision operator in reducing boundary slip computed by the immersed boundary-lattice Boltzmann method (IB-LBM). Rigorous analysis of the symmetric Poiseuille flows reveals that the relaxation time for the antisymmetric part controls the boundary velocity and the boundary slip velocity computed by the IB-LBM. In the simulation of the cylindrical Couette flows, the boundary slip caused by the use of the single relaxation time (SRT) model in the IB-LBM impairs the accuracy that the LBM intrinsically possesses. The IB-LBMs with the TRT exhibit second-order accuracy in space for both the direct forcing method and the implicit correction method.

  The Japan Society of Mechanical Engineers, 25 Oct. 2014, Fluids engineering conference ..., 2014, "GS35 - 1"-"GS35-2", Japanese


• The Accuracy Analysis of Immersed Boundary-Lattice Boltzmann Methods with Two Relaxation Times

  瀬田 剛, Rojas Roberto, 林 公祐

  日本計算工学会, Jun. 2014, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 19, 6p, Japanese


• 807 Effects of Liquid Viscosity on Flows Inside and Outside an Air Diffuser Pipe

  SAMPEI Tomoyuki, HAYASHI Kosuke, HOSOKAWA Shigeo, TOMIYAMA Akio, ZAW Hlwan Moe

  The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "8 - 11", Japanese


• 823 Lift Force Acting on Single Bubbles in Linear Shear Flows : Part II: numerical simulation

  HAMADA Takeshi, MATSUNAGA Akira, HAYASHI Kosuke, HOSOKAWA Shigeo, TOMIYAMA Akio

  The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "8 - 27", Japanese


• 822 Lift Force Acting on Single Bubbles in Linear Shear Flows : Part I: Experiment

  MATSUNAGA Akira, Hamada Takeshi, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

  The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "8 - 26", Japanese


• B121 Study on bubbly flow in a four by four rod bundle

  HOSOKAWA Shigeo, MURAMATSU Yuya, TADA Ryo, HAYASHI Kosuke, TOMIYAMA Akio

  Although area-averaged void fractions in subchannels have been measured frequently in literatures, distribution of local void fraction in a rod bundle have been rarely reported. Little is also known on bubble motion in a rod bundle. Distributions of local void fraction and bubble velocity in a 4x4 rod bundle were, therefore, measured using a conductance probe in this study. Liquid velocity was also measured using LDV. Experimental results showed that the distributions of the void fractions in the inner and side subchannels depend not only on lift force acting on bubbles but also on geometrical interaction between the bubble and the rod wall. The relative velocity between bubbles and liquid phase in the subchannel possesses non-uniform distribution over the cross-section. This is caused by increase in drag force acting on bubbles due to bubble deformation induced by interaction between the bubbles and the rod wall.

  The Japan Society of Mechanical Engineers, 20 Jun. 2012, National Symposium on Power and Energy Systems, 2012(17) (17), 61 - 62, Japanese


• 526 Interface Tracking Simulation of Mass Transfer in Gas-Liquid Two-Phase Flows

  Sakata Ryosuke, Hosoda Syogo, Hayashi Kosuke, Tomiyama Akio

  The Japan Society of Mechanical Engineers, 19 Mar. 2011, 関西支部講演会講演論文集, 2011(86) (86), "5 - 26", Japanese


• Large Eddy Simulation of Turbulent Cavitation Flow in a Nozzle

  GOSHIMA Daisuke, SOU Akira, HAYASHI Kosuke, TOMIYAMA Akio

  16 Dec. 2009, 微粒化シンポジウム講演論文集 = Symposium (ILASS-Japan) on Atomization, 18, 113 - 117, Japanese


• G105 Cavitating Flow in a T-shape Elbow

  Matsuoka Takashi, Uzaki Yuma, Hayashi Kosuke, Shakutsui Hideaki, Kakefuda Satomi, Hizume Makoto, Kikutani Isao

  Water is more liable to evaporate than oils since its saturated vapor pressure is higher than the ones of oils. Therefore it is important to prevent erosion due to cavitation bubbles in hydraulic devices using water. In our previous study, we reported that erosion at elbow of pipeline can be reduced by using T-shape elbow. However its mechanism has not been clarified yet. In the present study, we observed cavitating flows in T-shape elbows of different shapes using a digital and high-speed video cameras. The amount of cavity was evaluated from taking images. As a result we confirmed that (1) circulating flow is steadily formed when the length of cavity-trapping region L ≧ 22.5 mm. If L ≦ 15 mm, circulating flow is formed intermittently, or it is not formed, (2) The amount of cavitation bubbles in cavity-trapping region increases as L increases, and (3)there are two uses (a) T-shape elbows can be used to guide cavitation bubbles into the region, in which circulating flow is formed, for defending the downstream of pipeline. (b) Then the elbows can also be used to guide bubbles to the downstream so as to prevent erosion at the elbows.

  The Japan Society of Mechanical Engineers, 17 Nov. 2007, Fluids engineering conference ..., 2007, "G105 - 1"-"G105-4", Japanese


• 2504 Application of Cahn-Hilliard Equation to the Evaluation of Surface Tension Force

  HAYASHI Kosuke, TAKADA Naoki, TOMIYAMA Akio

  The Japan Society of Mechanical Engineers, 17 Nov. 2005, The Computational Mechanics Conference, 2005(18) (18), 805 - 806, Japanese


• Flow Visualization of Segregation Process in a Fluidized-Bed by Neutron Radiography

  FURUI Shuji, UMEKAWA Hisashi, HAYASHI Kousuke, OZAWA Mamoru, TAKENAKA Nobuyuki

  2005, IEEE Trans.on Nuclear Science, 52(1),295-298, English

  [Refereed]

  Others


• 改良SCAによる流体粒子の界面追跡計算

  林公祐, WIN M, 宋明良, 冨山明男

  2004, 日本混相流学会年会講演会講演論文集, 2004


• Interface Tracking Method based on Simplified Interface Reconstruction Method

  SOU Akira, HAYASHI Kosuke, TOMIYAMA Akio

  The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 111 - 112, Japanese


• 微粒化ノズル内キャビテーション流れと液体噴流の微粒化

  宋明良, 林公祐, 新田真一, 冨山明男

  2003, 日本混相流学会年会講演会講演論文集, 2003


• 液滴・噴霧燃焼の数値シミュレーション

  宋明良, 林公祐, 国本雅也, 冨山明男

  2003, 日本混相流学会年会講演会講演論文集, 2003


• 界面追跡法の改良 新しい界面移流スキームの提案

  林公祐, 宋明良, 中島健

  2002, 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, 2002

• 化学工学系流体シミュレーションの最前線 ―基礎・実践・将来展望― (最近の化学工学 72)

  化学工学会 流体プロセス部会, 化学工学会粒子・流体プロセス部会

  Contributor, 第１章, 化学工学会 関東支部, Jan. 2024, Japanese, ISBN: 4866938943


• 流体力学 (機械工学基礎課程)

  冨山, 明男, 梶島, 岳夫, 加藤, 健司, 宋, 明良, 高比良, 裕之, 林, 公祐, 細川, 茂雄

  朝倉書店, Apr. 2020, Japanese, ISBN: 4254237952


• Encyclopedia of Two-Phase Heat Transfer and Flow III: Macro and Micro Flow Boiling and Numerical Modeling Fundamentals

  HAYASHI KOSUKE

  Others, Chaps 1 and 2, World Scientific Publishing, May 2018, English, ISBN: 9789813229440

  Scholarly book

• 狭矩形容器内気泡流に及ぼす微細粒子及び界面活性剤の影響

  栗本遼, 堀田壮一郎, 春名弘太, 林公祐

  第90回化学工学会年会, Mar. 2025, Japanese

  Oral presentation


• Numerical study of the motion of single bubble rising between parallel plates

  Sosuke Tashiro, Ryo Kurimoto, Kosuke Hayashi

  38th CFD Symposium, Dec. 2024, Japanese

  Oral presentation


• Single bubbles rising through stagnant liquid between thin gap cells

  Takuto Wakamatsu, Ryo Kurimoto, Kosuke Hayashi

  38th CFD Symposium, Dec. 2024, Japanese

  Oral presentation


• 狭平板間静止液中単一気泡の分裂に関する研究

  伊東海希, 栗本遼, 林公祐, 冨山明男

  日本流体力学会年会2024, Sep. 2024, Japanese

  Oral presentation


• 鉛直細円柱群内を上昇する気泡の形状と終端速度

  栗本遼, NEUMEISTER Roberta Fatima, 小峰龍也, RIBATSKI Gerhardt, 林公祐

  日本流体力学会年会2024, Sep. 2024, Japanese


• 円管内旋回流による油水および固液分離に関する研究

  木村 融, 林 公祐, 栗本 遼, 雪島 良太, 滝本 英哉

  日本機械学会年次大会, Sep. 2024, Japanese

  Poster presentation


• 停滞水条件における3×3ロッドバンドル内での界面摩擦

  村瀬 道雄, 西田 浩二, 高木 俊弥, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 鉛直円管内旋回環状流内体積率及び圧力損失の一次元三流体モデルによる予測

  古東遼也, 栗本遼, 林公祐, 冨山明男

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 堆積層内気液二相流の流動特性に関する研究

  栗本遼, 高木俊弥, 林公祐, 村瀬 道雄, 川路正裕, 冨山明男

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 気泡塔内ボイド率に及ぼす初期液位依存性に関する研究

  芳田 直征, 林 公祐, 栗本 遼, 冨山 明男

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 気泡塔内非均質気泡流におけるドリフトフラックスパラメータの検討

  佐々木 翔平, 栗本 遼, 林 公祐

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• Experimental analysis of bubble terminal velocity in fiber bundle

  NEUMEISTER Roberta Fatima, KOMINE Ryuya, KURIMOTO Ryo, RIBATSKI Gherhardt, HAYASHI Kosuke

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 鉛直円管内テイラー気泡の液膜厚さに加振が及ぼす影響に関する研究

  堀田 修平, 山本 開斗, 栗本 遼, 林 公祐

  混相流シンポジウム2024, Sep. 2024, Japanese

  Poster presentation


• 平板間静止液中単一気泡の形状及び上昇速度に関する研究

  田代 壮佑, 栗本 遼, 林 公祐

  混相流シンポジウム2024, Sep. 2024, Japanese

  Poster presentation


• 鉛直細円柱群内の気泡の運動に関する研究

  小峰 龍也, Roberta Fátima Neumeister, 栗本 遼, Gherhardt Ribatski, 林 公祐

  混相流シンポジウム2024, Sep. 2024, Japanese

  Poster presentation


• フラッディング状態での鉛直管内流動特性に対する管径の影響

  高木 俊弥, 栗本 遼, 林 公祐, 村瀬 道雄, 冨山 明男

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 微細流路内テイラー気泡の形状に及ぼす界面活性剤の影響

  五十嵐 亮太, 栗本 遼, 林 公祐

  混相流シンポジウム2024, Sep. 2024, Japanese

  Poster presentation


• 平板間静止液中を上昇する単一気泡の形状及び抗力係数

  田代壮佑, 栗本遼, 林公祐

  混相流シンポジウム2024, Sep. 2024, Japanese

  Oral presentation


• 正方形マイクロチャネル内テイラー流の圧力損失と気泡速度に関する研究

  栗本 遼, 林 公祐, 冨山 明男

  第67回理論応用力学講演会, Sep. 2024, Japanese

  Oral presentation


• 脳動脈瘤内流れの血行力学パラメータの数値予測と機械学習による破裂リスク予測可能性の検討

  柴田悟, 林公祐, 木村英仁, 森達也, 冨山明男

  第37回数値流体力学シンポジウム, Dec. 2023, Japanese

  Oral presentation


• Surface Coverage of Bubbles with Surfactant or Particles

  Kosuke Hayashi, Takumi Mori, Koya Chujo, Ryota Igarashi, Ryo Kurimoto, Akio Tomiyama

  IUTAM Symposium on Dynamics and Interface Phenomena of Bubbles and Droplets at Multiple Scales, Dec. 2023, English

  [Invited]

  Oral presentation


• Effects of viscosity ratio on lift force acting on a spherical drop

  Kosuke Hayashi, Akio Tomiyma

  JSFM Annual Meeting 2023, Sep. 2023, English

  Oral presentation


• Study of surfactant adsorption on the surface of bubbles in a micro-channel

  Takumi Mori, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Multiphase Flow Symposium 2023, Aug. 2023, Japanese

  Oral presentation


• Measurement of drag coefficient of particle-attached bubbles generated by using micro-channel

  Koya Chujo, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Multiphase Flow Symposium 2023, Aug. 2023, Japanese

  Poster presentation


• Effect of bend curvature on void fraction of gas-liquid two-phase flow in a U-shaped bend

  Naoki Watanabe, Naoyuki Yoshida, Kosuke Hayashi, Ryo Kurimoto, Akio Tomiyama

  Multiphase Flow Symposium 2023, Aug. 2023, Japanese

  Poster presentation


• Effects of surfactant on drag and interfacial vorticity of spherical bubble

  Kosuke Hayashi, Dominique Legendre, Akio Tomiyama

  Multiphase Flow Symposium 2023, Aug. 2023, Japanese

  Oral presentation


• Effects of pipe diameter on interfacial and wall friction factors of swirling annular flows in a vertical pipe

  Ryoya Koto, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  Multiphase Flow Symposium 2023, Aug. 2023, Japanese

  Oral presentation


• Effects of Fine Particles and Surfactant on Bubbly Flows in Narrow Rectangular Column

  Ryo Kurimoto, Soichiro Horita, Kosuke Hayashi, Akio Tomiyama

  ASME-JSME-KSME Fluids Engineering Division, AJKFED 2023, Jul. 2023, English

  Oral presentation


• Lift Correlations of Ellipsoidal Bubbles in Low and High Viscosity Liquids

  Kosuke Hayashi

  11th International Conference on Multiphase Flow, ICMF-2023, Apr. 2023, English

  [Invited]

  Keynote oral presentation


• 中空糸膜を有する塔内気泡流に関する研究

  髙屋慎, 栗本遼, 林公祐, 冨山明男

  日本機械学会関西支部第98期定時総会講演会, Mar. 2023, Japanese

  Oral presentation


• Effects of Upper and Lower Pipe Ends on Interfacial and Wall Friction Factors under Counter-Current Flow Limitation in a Vertical Pipe

  M. Yamashita, R. Kurimoto, K. Hayashi, T. Takaki, M. Murase, A. Tomiyama

  ANS Winter Meeting 2022, Nov. 2022, English

  Oral presentation


• Effects of Liquid Viscosity on Friction Factors of Gas-Liquid Swirling Annular Flows in a Vertical Pipe

  R. Koto, R. Kurimoto, K. Hayashi, A. Tomiyama

  ANS Winter Meeting 2022, Nov. 2022, English

  Oral presentation


• Fragmentation of Liquid Drop Falling through Miscible Liquid due to Rayleigh-Taylor Instability

  Rina Nakajima, Kosuke Hayashi

  1st European-American-Japanese Two-Phase Flow Group Meeting (EAJTPFGM22), Oct. 2022, English

  Nominated symposium


• Bubbly Flows in a Column with Submerged Hollow Fiber Membranes

  R. Kurimoto, S. Takaya, K. Hayashi, A. Tomiyama

  1st European-American-Japanese Two-Phase Flow Group Meeting (EAJTPFGM22), Oct. 2022, English

  Oral presentation


• Effects of microbubbles on removal of highly-viscous oil adhering to channel wall

  Fuyuki Okamoto, Yuegui Li, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

  日本流体力学会年会2022, Sep. 2022, Japanese

  Oral presentation


• Pressure Drop of Single Bubble in Taylor Flows through Square Microchannels

  R. Kurimoto, K. Hayashi, A. Tomiyama

  4th International Symposium on Multiscale Multiphase Process Engineering (MMPE), Sep. 2022, English

  Oral presentation


• Bubbly Flows in a Vertical Pipe with Horizontal Oscillation

  K. Hayashi, H. Kato, N. Yoshida, R. Kurimoto, A. Tomiyama

  4th International Symposium on Multiscale Multiphase Process Engineering (MMPE), Sep. 2022, English

  Poster presentation


• Pressure drop of single bubble in Taylor flows through square microchannels

  Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  混相流シンポジウム2022, Aug. 2022, Japanese

  Oral presentation


• Breakup of single two-dimensional bubbles in stagnant water

  Kazuma Minamitani, Ryoya Kotol, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  混相流シンポジウム2022, Aug. 2022, Japanese

  Oral presentation


• Effects of upper and lower pipe ends on interfacial and wall friction factors under counter-current flow limitation in a vertical pipe

  Masaki Yamashita, Ryo Kurimotol, Kosuke Hayashi, Toshiya Takaki, Michio Murase, Akio Tomiyama

  混相流シンポジウム2022, Aug. 2022, Japanese

  Oral presentation


• Effects of swirl intensity and liquid viscosity on interfacial and wall friction factors of annular flows in a vertical pipe

  Ryoya Koto, Ryo Kurimoto, Kosuke Hayashi, Akio Tomiyama

  混相流シンポジウム2022, Aug. 2022, Japanese

  Oral presentation


• Numerical Simulations of Single Contaminated Spherical Drops

  元木 裕哉, 林 公祐, 細川 茂雄, 冨山 明男

  日本流体力学会年会2021, Sep. 2021, Japanese

  Oral presentation


• 堆積層内における気液二相流に関する研究

  田中 裕太, 栗本 遼, 林 公祐, 村瀬 道雄, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese

  Oral presentation


• 振動を伴う鉛直円管内の気液二相流動特性に関する研究

  加藤 大樹, 芳田 直征, 林 公祐, 栗本 遼, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese


• 鉛直円管内気液二相旋回流の界面および壁面摩擦係数に及ぼす旋回強度の影響

  今泉 敦哉, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese


• 鉛直サーペンタイン管内気液二相流のボイド率及び液膜厚さ

  福間 淳平, 加次 淳一郎, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese


• 垂直U字管内気液二相流のボイド率に関する研究

  安井 翔亮, 林 公祐, 栗本 遼, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese


• 気泡流による中空糸膜の汚れ除去と揺動に関する研究

  高屋 慎, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese


• 気泡塔内平均及び局所ボイド率の初期液位依存性に関する研究

  安富 舜, 小林 暢也, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2021, Aug. 2021, Japanese


• 鉛直円管内気液二相流に及ぼす管加速度の影響に関する研究

  芳田 直征, 林 公祐, 栗本 遼, 冨山 明男

  混相流シンポジウム2020, Aug. 2020, Japanese

  Oral presentation


• 鉛直円管内旋回環状流の界面及び壁面摩擦係数に及ぼす液相粘度の影響

  矢原 喜裕, 今泉 敦哉, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2020, Aug. 2020, Japanese

  Oral presentation


• 気泡群による液相中粒子の輸送能力評価

  川端 雅俊, 藤原 京平, 林 公祐, 冨山 明男

  混相流シンポジウム2020, Aug. 2020, Japanese

  Oral presentation


• 鉛直 U 字管内気液二相流の流動特性に関する研究

  森 仁志, 福間 淳平, 加次 淳一郎, 林 公祐, 冨山 明男

  混相流シンポジウム2020, Aug. 2020, Japanese

  Oral presentation


• 鉛直円管内アルカリ溶液中二酸化炭素気泡の化学吸収に関する研究

  松尾 優樹, Devy Setiorini Sa’adiyah, 栗本 遼, 林 公祐, 冨山 明男

  混相流シンポジウム2020, Aug. 2020, Japanese

  Oral presentation


• Numerical Simulations of Flows in Cerebral Aneurysms Using the Lattice Boltzmann Method

  大崎 侑, 林 公祐, 木村 英仁, 甲村 英二, 冨山 明男

  日本機械学会関西支部第95期定時総会講演会, Mar. 2020, Japanese

  Oral presentation


• Effects of Surfactant on Taylor Flows in a Microchannel

  OKUI SYUYA, HAYASHI KOSUKE, YOSHIDA NAOYUKI, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  2019 Annual Meeting of the Japanese Society of Fluid Mechanics, Sep. 2019, Japanese, 日本流体力学会, 調布, Domestic conference

  Oral presentation


• Interfacial and wall friction factors for gas-liquid counter-current flow in vertical pipes

  GODA RAITO, SHIMAMURA TAKEYUKI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, MURASE MICHIO, TOMIYAMA AKIO

  Multiphase Flow Symposium 2019, Aug. 2019, Japanese, 日本混相流学会, 福岡, Domestic conference

  Oral presentation


• Interfacial and wall friction factors of a swirling annular flow

  YAHARA YOSHIHIRO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  Multiphase Flow Symposium 2019, Aug. 2019, Japanese, 日本混相流学会, 福岡, Domestic conference

  Oral presentation


• Three-Dimensional Flow Characteristics around a Bulge Structure in a Cavity Swept by a Viscoelastic Fluids

  SUZUKI Hiroshi, KAWATA Masaki, HIDEMA Ruri, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

  Annual European Rheology Conference 2019 (AERC 2019), Apr. 2019, English, Portorož, Slovenia, International conference

  Oral presentation


• 管路内気泡・液滴の運動に及ぼす界面活性剤の影響

  HAYASHI KOSUKE

  第20回気液固分散工学サロン, Mar. 2019, Japanese, 芝浦工業大学, Domestic conference

  [Invited]

  Invited oral presentation


• 単一液滴に作用する力の実験的分析

  SHIGEKANE GAKU, HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  第95期日本機械学会流体工学部門講演会, Nov. 2018, Japanese, 日本機械学会, Muroran, Domestic conference

  Poster presentation


• 可溶性界面活性剤により汚染された球形液滴の数値シミュレーション

  HAYASHI KOSUKE, SAKAI KOHEI, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  日本流体力学会年会2018, Sep. 2018, Japanese, 大阪大学, Domestic conference

  Oral presentation


• 上端シャープエッジ鉛直管における気液二相対向流の界面及び壁面摩擦係数

  SHIMAMURA TAKEYUKI, GODA RAITO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, MURASE MICHIO, NISHIDA KOJI, TOMIYAMA AKIO

  混相流シンポジウム2018, Aug. 2018, Japanese, 仙台, Domestic conference

  Oral presentation


• 鉛直円管内単一二酸化炭素気泡の物質移動に及ぼすアルコールと電解質の相互作用の影響

  HIROTA YUTAKA, HORI YOHEI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2018, Aug. 2018, Japanese, 仙台, Domestic conference

  Oral presentation


• U字管内気液二相流の圧力損失に及ぼす液相粘度の影響

  HAYASHI KOSUKE, SUZUKI DAIKI, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2018, Aug. 2018, Japanese, 仙台, Domestic conference

  Oral presentation


• 気泡による微細粒子輸送に関する研究

  KANG JYUNGYU, HAYASHI KOSUKE, TOMIYAMA AKIO, TAGUCHI KENJI, TSUKAGUCHI YUICHI

  混相流シンポジウム2017, Aug. 2017, Japanese, 東京, Domestic conference

  Oral presentation


• 鉛直円管内旋回気液二相流の圧力損失に関する研究

  FUNAHASHI HAYATO, KINOSHITA HIROHITO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2017, Aug. 2017, Japanese, 東京, Domestic conference

  Oral presentation


• U字管内気液二相流の圧力損失に関する研究

  SUZUKI DAIKI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2017, Aug. 2017, Japanese, 東京, Domestic conference

  Oral presentation


• Numerical Simulation of Contaminated Bubbles and Drops Using Level Set Method (Keynote Lecture)

  HAYASHI KOSUKE

  International Conference on Numerical Methods in Multiphase Flow, Jun. 2017, English, Tokyo, International conference

  Keynote oral presentation


• 二相流数値計算検証のための実験計測

  HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  日本機械学会研究分科会RC270第3回分科会, Dec. 2016, Japanese, 日本機械学会, Tokyo, Domestic conference

  Nominated symposium


• 気泡と液液のシミュレーションとモデリング（招待講演）

  HAYASHI KOSUKE

  第22回流動化・粒子プロセッシングシンポジウム, Dec. 2016, Japanese, Domestic conference

  Oral presentation


• 時空間フィルタ流速計による界面活性剤の吸着を伴う液滴の測定

  HOSOKAWA SHIGEO, MASUKURA YUYA, HAYASHI KOSUKE, TOMIYAMA AKIO

  第94期日本機械学会流体工学部門講演会, Nov. 2016, Japanese, Domestic conference

  Oral presentation


• 塔径及び初期液位が気泡塔内平均ボイド率に及ぼす影響

  内田 賢吾, 橋田 昌明, 佐々木 翔平, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2016, Aug. 2016, Japanese, Domestic conference

  Oral presentation


• 静止液中単一気泡の形状に及ぼす界面活性剤の影響に関する研究

  竹川 稔彦, 青山 昌平, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2016, Aug. 2016, Japanese, Domestic conference

  Oral presentation


• Shapes of single bubbles in infinite stagnant liquids contaminated with surfactant

  TAKEGAWA TOSHIHIKO, AOYAMA SHOHEI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2016, Aug. 2016, Japanese, Domestic conference

  Oral presentation


• 鉛直円管内電解質水溶液中単一二酸化炭素気泡の物質移動に関する研究

  堀 陽平, 青木 二郎, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2016, Aug. 2016, Japanese, Domestic conference

  Oral presentation


• U字管内気液二相流の圧力損失に関する研究

  宮地 祥人, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, 舘山 将也, 廣津 誠, 竹田 信宏

  混相流シンポジウム2016, Aug. 2016, Japanese, Domestic conference

  Oral presentation


• 散気管内外の流れに散気孔の周方向角度が及ぼす影響

  SATO RYO, MIYAYOSHI TATSUYA, HAYASHI KOSUKE, TOMIYAMA AKIO

  日本機械学会関西支部第91期定時総会講演会, pp. 129-132, Mar. 2016, Japanese, 大阪, Domestic conference

  Oral presentation


• 埋め込み境界－熱流動格子ボルツマン法における熱流束境界条件の精度に及ぼす二緩和時間衝突則の影響

  SETA TAKESHI, HAYASHI KOSUKE, TOMIYAMA AKIO

  第29回数値流体力学シンポジウム, Dec. 2015, Japanese, 九州大学筑紫キャンパス, Domestic conference

  Oral presentation


• Reduction of the Temperature Jump in the Immersed Boundary-Thermal Lattice Boltzmann Method

  SETA TAKESHI, HAYASHI KOSUKE, TOMIYAMA AKIO

  American Physical Society 68th Annual DFD Meeting, Nov. 2015, English, Boston,Massachusetts, U.S.A., International conference

  Oral presentation


• 境界適合型時空間フィルタ流速計と界面活性剤濃度評価の試み

  HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  日本機械学会研究分科会RC263第6回分科会, Sep. 2015, Japanese, 日本機械学会, Tokyo, Domestic conference

  Nominated symposium


• Study on adsorption of surfactant at interface of a spherical drop

  MASUKURA YUYA, HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  日本流体力学会年会2015, Sep. 2015, Japanese, 日本流体力学会, Tokyo, Domestic conference

  Oral presentation


• 二緩和時間衝突則に基づく埋め込み境界法を適用した熱流動格子ボルツマン法

  SETA TAKESHI, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2015, Aug. 2015, Japanese, 高知工科大学, Domestic conference

  Oral presentation


• Evaluation of Marangoni Stress Acting on a Single Contaminated Spherical Drop

  MASUKURA YUYA, HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2015, Aug. 2015, Japanese, Kochi, Domestic conference

  Oral presentation


• 一様せん断流中単一気泡に働く揚力に関する研究

  AOYAMA SHOHEI, TAKEGAWA TOSHIHIKO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2015, Aug. 2015, Japanese, 高知, Domestic conference

  Oral presentation


• サブクール水中における蒸気凝縮音に関する研究

  IKEUCHI KAZUTAKA, TATEYAMA MASAYA, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, HIROTSU MAKOTO, TAKEDA NOBUHIRO

  混相流シンポジウム2015, Aug. 2015, Japanese, 高知, Domestic conference

  Oral presentation


• Effects of liquid-separation components on two-phase swirling flow in a steam separator

  KATONO KENICHI, FUNAHASHI HAYATO, HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

  第20回動力・エネルギー技術シンポジウム, Jun. 2015, Japanese, 日本機械学会動力エネルギーシステム部門, Sendai, Domestic conference

  Oral presentation


• 冷却材喪失事故時の格納容器内温度シミュレーションモデルの検証；（2）空気及び蒸気吹込み実験

  野末 貴大, 藤井 雄基, HAYASHI KOSUKE, 細川 茂雄, 冨山 明男, 歌野原 陽一, 山本 泰功, 村瀬 道雄

  日本原子力学会 春の大会 2015, Mar. 2015, Japanese, 茨城, Domestic conference

  Oral presentation


• Reduction of the velocity slips by the immersed boundary-lattice Boltzmann method

  SETA TAKESHI, ROJAS ROBERT, HAYASHI KOSUKE, TOMIYAMA AKIO

  日本機械学会流体工学部門講演会, Oct. 2014, Japanese, 富山, Domestic conference

  Oral presentation


• 時空間フィルタ流速計による単一液滴に作用する界面せん断応力の評価

  HOSOKAWA SHIGEO, KITAHATA KYOSUKE, HAYASHI Kosuke, TOMIYAMA AKIO

  日本流体力学会年会2014, Sep. 2014, Japanese, 日本流体力学会, 宮城県仙台市, Domestic conference

  Oral presentation


• 時空間フィルタ流速計による界面近傍速度測定

  HOSOKAWA SHIGEO, KITAHATA KYOSUKE, HAYASHI Kosuke, TOMIYAMA AKIO

  理論応用力学講演会, Sep. 2014, Japanese, 日本学術会議, 東京都, Domestic conference

  Oral presentation


• 非一様電場におけるオリフィスからの気泡成長

  KURIMOTO RYO, DI MARCO PAOLO, MINAGAWA HISATO, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2014, E151, USB Memory (2 pages), Jul. 2014, Japanese, 札幌, Domestic conference

  Oral presentation


• 固体壁に付着した液滴に及ぼす界面活性剤の影響に関する研究

  KITANO MASAAKI, ABHINAV DHAR, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2014, A311, USB Memory (2 pages), Jul. 2014, Japanese, 札幌, Domestic conference

  Oral presentation


• 汚れ系における気泡の界面追跡計算と物質移動

  HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2014, B331, USB Memory (2 pages), Jul. 2014, Japanese, 札幌, Domestic conference

  Keynote oral presentation


• スラリー気泡塔内平均ボイド率に及ぼす初期液位の影響

  SASAKI SHOHEI, OJIMA SHIMPEI, HAYASHI KOSUKE, TOMIYAMA AKIO

  混相流シンポジウム2014, A311, USB Memory (2 pages), Jul. 2014, Japanese, Domestic conference

  Oral presentation


• スラリー気泡塔における気泡合体に粒子径が及ぼす影響

  OJIMA SHIMPEI, SASAKI SHOHEI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  混相流シンポジウム2014, B232, USB Memory (2 pages), Jul. 2014, Japanese, 札幌, Domestic conference

  Oral presentation


• U字ベンドにおける空気水系気液二相流の圧力損失に関する研究

  KOBAYASHI SHINGO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, 廣津 誠, 舘山 将也, 竹田 信宏

  混相流シンポジウム2014, B223, USB Memory (2 pages), Jul. 2014, Japanese, 札幌, Domestic conference

  Oral presentation


• Numerical Study of Concentrated Emulsion Flow Through a Membrane Pore in Oil/Water Separation

  Yusuke KAGAWA, Toru ISHIGAMI, Hiromi FUSE, Yasushi MINO, Kosuke HAYASHI, Hideto MATSUYAMA

  10th International Congress on Membranes and Membrane Processes (ICOM2014), Jul. 2014, English, Suzhou, China, International conference

  Oral presentation


• 散気管内外の流れに及ぼす液相粘度の影響

  SAMPEI TOMOYUKI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, HLWAN MOE ZAW

  日本機械学会関西支部定時総会・講演会2014, Mar. 2014, Japanese, 大阪府立大学, Domestic conference

  Oral presentation


• 一様せん断流中単一気泡に働く揚力に関する研究 (第2 報 数値計算)

  HAMADA TAKESHI, MATSUNAGA AKIRA, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

  日本機械学会関西支部定時総会・講演会2014, Mar. 2014, Japanese, 大阪府立大学, Domestic conference

  Oral presentation


• 一様せん断流中単一気泡に働く揚力に関する研究(第 1 報 実験)

  MATSUNAGA Akira, HAMADA Takeshi, HOSOKAWA SHIGEO, HAYASHI Kosuke, TOMIYAMA AKIO

  日本機械学会 関西支部第89期定時総会講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 大阪, Domestic conference

  Oral presentation


• 膜分離プロセスにおける流体挙動のモデリングとシミュレーション

  ISHIGAMI TORU, 布施 ひろみ, 香川 裕輔, 浅尾 慎一, HAYASHI KOSUKE, MINO YASUSHI, MATSUYAMA HIDETO

  膜シンポジウム2013, Nov. 2013, Japanese, 日本膜学会, 京都府立医科大学 （京都）, Domestic conference

  Oral presentation


• 散気管内外の流れに液相粘性が及ぼす影響に関する研究

  HAYASHI Kosuke, SAMPEI Tomoyuki, TOMIYAMA Akio, FURUNO Shinsuke, KIRA Fumihiro

  混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference

  Oral presentation


• 鉛直円管内CO2気泡周りの濃度分布計測

  HOSODA Shogo, AOKI Jiro, HAYASHI Kosuke, HOSOKAWA Shigeo, TOMIYAMA Akio

  混相流シンポジウム2013, Aug. 2013, Japanese, 日本混相流学会, 長野, Domestic conference

  Oral presentation


• 粘性力及び表面張力の評価法が界面運動の数値予測に及ぼす影響

  HAYASHI KOSUKE, TOMIYAMA AKIO

  第62回理論応用力学講演会, Mar. 2013, Japanese, 東京工業大学, Domestic conference

  Oral presentation


• Effects of surfactant on the lift force acting on bubbles in linear shear flows

  HAYASHI, Kosuke, MATSUNAGA, Akira, HAMADA, Takeshi, TOMIYAMA, Akio

  JSMF Annual Meeting 2012, Aug. 2012, Japanese, 日本混相流学会, Kashiwa, Domestic conference

  Oral presentation


• Reduction of boundary slip from the immersed boundary-lattice Boltzmann method by two-relaxation-time

  SETA, Takeshi, ROJAS, Roberto, HAYASHI, Kosuke, TOMIYAMA, Akio

  JSMF Annual Meeting 2012, Aug. 2012, Japanese, 日本混相流学会, Kashiwa, Domestic conference

  Oral presentation


• Immersed Boundary-Finite Difference Lattice Boltzmann Method Using Two Relaxation Times

  ROJAS, Roberto, SETA, Takeshi, HAYASHI, Kosuke, TOMIYAMA, Akio

  JSMF Annual Meeting 2012, Aug. 2012, Japanese, 日本混相流学会, Kashiwa, Domestic conference

  Oral presentation


• Study on bubbly flow in a four by four rod bundle

  HOSOKAWA Shigeo, MURAMATSU Yuya, TADA Ryo, HAYASHI Kosuke, TOMIYAMA Akio

  The 17th National Symposium on Power and Energy Systems (SPES 2012), Jun. 2012, Japanese, 日本機械学会動力・エネルギー部門, Fukuoka, Domestic conference

  Oral presentation


• Basic study of flow inside a diffuser for membrane bioreactor

  KIRA Fumihiro, KAWAGISHI Tomiki, FURUNO Shinsuke, SAMPEI Tomoyuki, HAYASHI Kosuke, TOMIYAMA Akio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 京都, Domestic conference

  Oral presentation


• Dissolution process of a high Schmidt and low Reynolds numbers

  HOSODA Shogo, HAYASHI Kosuke, TOMIYAMA Akio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 京都, Domestic conference

  Oral presentation


• 空間フィルタ流速計による気泡速度の測定

  HOSOKAWA Shigeo, SATO Hiroyasu, MATSUMOTO Takaaki, HAYASHI Kosuke, TOMIYAMA Akio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 日本混相流学会, Kyoto, Domestic conference

  Oral presentation


• Interface tracking simulation of bubbles with adsorption and desorption of soluble surfactant

  HAYASHI Kosuke, KURIMOTO Ryo, TOMIYAMA Akio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 日本混相流学会, 京都, Domestic conference

  Oral presentation


• Effects of particle size and concentration on bubble coalescence in slurry bubble column

  OJIMA Shinpei, OBATA Satoshi, HAYASHI Kosuke, TOMIYAMA Akio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 京都, Domestic conference

  Oral presentation


• Countercurrent flow limitation at the upper end of PWR pressurizer surge line

  YANAGI Chihiro, FUTATSUGI Takashi, HAYASHI Kosuke, TOMIYAMA Akio, KINOSHITA Ikuo, MURASE Michio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 京都, Domestic conference

  Oral presentation


• 4x4ロッドバンドル内気液二相気泡流に関する研究

  MURAMATSU Yuya, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

  JSMF Annual Meeting 2011, Aug. 2011, Japanese, 日本混相流学会, Kyoto, Domestic conference

  Oral presentation


• 界面追跡法に基づく気液間物質輸送の数値計算

  SAKATA, Ryosuke, HOSODA, Shogo, HAYASHI, Kosuke, TOMIYAMA, Akio

  日本機械学会関西支部 第86期定時総会講演会, Mar. 2011, Japanese, 日本機械学会関西支部, 京都, Domestic conference

  Oral presentation


• Advances in Interface Tracking Method for Hear and Mass Transfers

  HAYASHI Kosuke, TOMIYAMA Akio, ZUN Iztok

  14th Organized Multiphase Flow Forum 2010, Nov. 2010, Japanese, The Japan Society for Multiphase Flow, Sapporo, Hokkaido, Domestic conference

  [Invited]

  Invited oral presentation


• Numerical simulation of bubbly flow in slurry using multi-fluid model

  OBATA, Satoshi, HAYASHI, Kosuke, TOMIYAMA, Akio

  JSMF Annual Meeting 2010, Jul. 2010, Japanese, Hamamatsu, Domestic conference

  Oral presentation


• 汚泥減圧浮上濃縮装置の開発

  OKU, Tomoaki, SAWAI, Masakazu, MOCHIZUKi, Shuichi, HAYASHI, Kosuke, SUZUKI, Takayuki, SHAKUTSUI, Hideaki

  日本混相流学会年会講演会2010, Jul. 2010, Japanese, 静岡, Domestic conference

  Oral presentation


• A correlation of terminal velocity for Taylor drops in vertical pipes

  KURIMOTO, Ryo, HAYASHI, Kosuke, TOMIYAMA, Akio

  JSMF Annual Meeting 2010, Jul. 2010, Japanese, Hamamatsu, Domestic conference

  Oral presentation


• Large Eddy Simulation of Cavitating Turbulent Flow in a Nozzle

  GOSHIMA Daisuke, SOU Akira, HAYASHI Kosuke, TOMIYAMA Akio

  18th Symposium on Atomization (ILASS-Japan), Dec. 2009, Japanese, 日本液体微粒化学会, Kyushu University, Domestic conference

  Oral presentation


• Pressure Drops in Rod Bundle with Partial Length Rods

  OHTA Motoki, HAYASHI Kosuke, HOSOKAWA Shigeo, TOMIYAMA Akio

  JSMF Annual Meeting 2009, Aug. 2009, Japanese, 日本混相流学会, Kumamoto, Domestic conference

  Oral presentation


• 水平管内マイクロバブル乱流の摩擦圧力損失特性に関する研究

  HOSHINO, Takeshi, AOTA, Koichi, HAYASHI, Kosuke, SHAKUTSUI, Hideaki

  日本混相流学会年会講演会2009, pp. 224-225, Aug. 2009, Japanese, Domestic conference

  Oral presentation


• Heat Transfer Enhancement by Air Bubble Rising through Thermally Stratified Layer

  HAYASHI Kosuke, PERPAR Matjaz, ZUN Iztok, TOMIYAMA Akio

  JSMF Annual Meeting 2009, Aug. 2009, Japanese, 日本混相流学会, Kumamoto, Domestic conference

  Oral presentation


• 気相体積率に基づく旋回気液二相流の流動様式判別

  YAMASHITA, Kyohei, TAKAGAKI, Shintaro, HONMA, Naoki, HAYASHI, Kosuke, SHAKUTUI, Hideaki

  日本混相流学会年会講演会2009, pp. 152-153, Aug. 2009, Japanese, 熊本, Domestic conference

  Oral presentation


• Terminal velocities of single large drops rising through a vertical pipe

  YOSHIKAWA Yasuki, KURIMOTO Ryo, HAYASHI Kosuke, TOMIYAMA Akio

  JSMF Annual Meeting 2009, Aug. 2009, Japanese, 日本混相流学会, Kumamoto, Domestic conference

  Oral presentation


• サイホンを利用した汚泥減圧濃縮装置の開発

  OKU, Tomoaki, SHIMADA, Mitsuhiro, HAYASHI, Kosuke, SAWAI, Masakazu, MOCHIZUKI, Shuichi, SHAKUTSUI, Hideaki

  日本高専学会第15回年会・講演会, Aug. 2009, Japanese, 愛知, Domestic conference

  Oral presentation


• T字形のエルボを流動するキャビテーションに関する研究

  NAEKI, Shinya, MATSUOKA, Takashi, HAYASHI, Kosuke, SHAKUTSUI, Hideaki, KIKUTANI, Isao, NAEKI, Shinya

  日本混相流学会年会講演会2008, pp. 244-245, Jun. 2008, Japanese, 会津, Domestic conference

  Oral presentation


• T字形エルボにおけるキャビテーションの流動

  MATSUOKA, Takashiq, UZAKI, Yuma, HAYASHI, Kosuke, SHAKTSUI, Hideaki, KAKEFUDA, Satomi, HIZUME, Makoto, KIKUTANI, Isao

  日本機械学会流体工学部門講演会, CD-ROM (4 pages), Nov. 2007, Japanese, 日本機械学会, 広島, Domestic conference

  Oral presentation


• 鉛直管内旋回気液二相流の流動様式と旋回長さに関する研究

  TAKAGAKI, Shintaro, TAKEDA, Hiroaki, HAYASHI, Kosuke, SHAKUTSUI, Hideaki

  日本混相流学会年会講演会2007, pp. 152-153, Jun. 2007, Japanese, 日本混相流学会, 北海道, Domestic conference

  Oral presentation


• フェーズフィールド界面追跡法による二相流数値シミュレーション

  TAKADA, Naoki, HIROKAWA, Keishun, HAYASHI, Kosuke, TOMIYAMA, Akio

  日本流体力学会第20回数値流体力学シンポジウム, CO-ROM (6 pages), Dec. 2006, Japanese, 日本流体力学会, 名古屋, Domestic conference

  Oral presentation


• Study on Lift Force Acting on Single Drops in Linear Shear Flow

  OGAWA Kohei, Win Myint, HAYASHI Kosuke, HOSOKAWA Shigeo, TOMIYAMA Akio

  JSMF Annual Meeting 2006, Aug. 2006, Japanese, Kanazawa, Domestic conference

  Oral presentation


• 二相流シミュレーションの界面移流・再構成計算に対するカーン‐ヒリヤード方程式の適用性の検討

  TAKADA, Naoki, HIROKAWA, Keishun, HAYASHI, Kosuke, TOMIYAMA, Akio

  日本計算工学会第11回計算工学講演会, pp. 415-416, Jun. 2006, Japanese, 日本計算工学会, 大阪, Domestic conference

  Oral presentation


• 表面張力評価へのカーン‐ヒリヤード方程式の応用

  HAYASHI, Kosuke, TAKADA, Naoki, TOMIYAMA, Akio

  日本機械学会第18回計算力学講演会, pp. 805-806, 2005, Japanese, 日本機械学会, 筑波, Domestic conference

  Oral presentation


• 改良SCA法による液体粒子の界面追跡計算

  林 公祐, Win Myint, 宋 明良, 冨山 明男

  日本混相流学会年会講演会, 2004, Japanese, 日本混相流学会, 岡山大学, Domestic conference

  Oral presentation


• 微粒化ノズル内キャビテーション流れと液体噴流の微粒化

  宋 明良, 林 公祐, 新田 真一, 冨山 明男

  日本混相流学会年会講演会, 2003, Japanese, 日本混相流学会, 大阪大学, Domestic conference

  Oral presentation


• 簡素化界面再構築法に基づく界面追跡法

  宋 明良, 林 公祐, 冨山 明男

  日本機械学会第16回計算力学講演会, 2003, Japanese, 日本機械学会計算力学部門, 神戸大学工学部, Domestic conference

  Oral presentation


• 界面追跡法による気液二相流数値予測の試み

  林 公祐, 宋 明良, 冨山 明男

  産学官技術フォーラム’03, 2003, Japanese, 神戸市立工業高等専門学校, 神戸商工会議所, 神戸市産業振興センター, Domestic conference

  Poster presentation


• 液滴・噴霧燃焼の数値シミュレーション

  宋 明良, 林 公祐, 國本 雅也, 冨山 明男

  日本混相流学会年会講演会, 2003, Japanese, 日本混相流学会, 大阪大学, Domestic conference

  Oral presentation

• Society for Chemical Engineers, Japan

  Mar. 2024 - Present


• 日本流体力学会

  May 2018 - Present


• 日本高専学会

  Jul. 2009 - Jun. 2010


• 日本混相流学会


• 日本機械学会

• 旋回機構導入による用途別気泡塔運転制御の基盤技術の確立

  佐々木 翔平, 栗本遼, 林公祐

  日本学術振興会, 科学研究費助成事業, 基盤研究(C), 松江工業高等専門学校, Apr. 2025 - Mar. 2028


• Modeling of lift force acting on contaminated deformed bubbles in terms of surface vorticity and its application to bubbly flows

  林 公祐, 栗本 遼, 冨山 明男

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2024 - Mar. 2027


• Development of numerical method for bubbly flows inside and outside dense vertical structures

  栗本 遼, 林 公祐

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2023 - Mar. 2026, Coinvestigator


• 洗浄機械における旋回流を利用した 油水分離促進技術の可能性調査

  兵庫県, 成長産業育成のための研究開発支援事業, 可能性調査・研究, 森合精機・神戸大学, Sep. 2024 - Mar. 2025, Others


• 狭隘流路内を運動する気泡の実用的抗力モデルの開発

  関西エネルギー・リサイクル科学研究振興財団, 研究助成, 神戸大学, Apr. 2024 - Mar. 2025, Principal investigator


• 粒子に覆われ安定化された気泡の掩蔽状態よ揚力機構の解明

  林公祐

  JKA, 研究補助, 個別研究, Apr. 2023 - Mar. 2024, Principal investigator


• Development of a Surfactant Separator by Using Taylor Flows in Microchannels

  林 公祐, 冨山 明男

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2020 - 31 Mar. 2023

  本研究課題では，界面活性剤を含む微細流路内テイラー流の特性を解明するとともに，テイラー流を利用した高効率界面活性剤分離技術の基盤を確立することを目的として各要素研究を推進している．微細流路内テイラー気泡の形成に関して，これまでに界面活性剤の効果により気泡長さが増加する形成モードと減少する形成モードがあることを明らかにしてきた．2021年度は，気液体積流束の範囲を広くとって実験を行い，幅500マイクロメートルの微細流路内での形成モードの流量配分依存性について詳しく調べたところ，本条件の範囲においては，ほとんどの条件で増加のモードであることを明らかにした．その理由について，吸脱着および流れのタイムスケールからなる八田数と，マンランゴニ応力と粘性力のオーダーからなるマランゴニ数をもとにモード遷移の主要因を検討した．界面活性剤分離器開発について，種々の界面活性剤濃度で分離実験を行った．その結果，テイラー流として微細流路を通過させることによって，液相の初期界面活性剤濃度が臨界ミセル濃度前後の広い範囲で半分程度に低減できることを明らかにした．一方，本実験結果から，微細流路内の吸着状態を検討し，微細流路と分離槽における分離過程について検討した．また，微細流路通過後の分離槽における気泡挙動が分離器設計上重要であるため，気泡力学的検討を前年度に引き続いてさらに推進し，揚力や界面活性剤が及ぼす気泡運動への影響への理解を深化させた．


• 粒子付着気泡生成器開発とその介在物除去技術への展開

  林公祐

  カシオ科学振興財団, 研究協賛, Dec. 2021 - Nov. 2022, Principal investigator


• Investigation and modeling of adsorption-desorption kinetics of surfactants at interface with deformation and oscillation

  Hosokawa Shigeo

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kansai University, 01 Apr. 2019 - 31 Mar. 2022

  Bubbles and drops in a contaminated system can be found in many industrial applications and natural phenomena. The contaminants such as surface-active agents (surfactant) adsorb on the interface of bubbles or drops and change mass, momentum, and heat transfer characteristics. Although there are lots of knowledge and models of the adsorption-desorption kinetics for quiescent systems, those have rarely been validated for a moving interface due to the lack of experimental data. Hence, we experimentally investigated local viscous stress, pressure, and surfactant concentration at the moving interface of drops falling in a stagnant liquid containing surfactant based on the velocity distribution measured by spatiotemporal filter velocimetry (SFV). The SFV was extended to generalized coordinate systems to evaluate adsorption characteristics of deformed drops. We discussed the adsorption-desorption kinetics and the influence of the adsorption on the fluid force acting on the drop.


• 強制振動管内気液二相流に及ぼす慣性力の影響の解明

  林公祐

  マツダ財団, マツダ研究助成, Nov. 2020 - Mar. 2022, Principal investigator


• 物理吸収・化学吸収を伴う高気相流量・高粒子濃度スラリー気泡塔の数値予測技術の開発

  冨山 明男

  科学研究費補助金／基盤研究(A), Apr. 2018 - Mar. 2022

  Competitive research funding


• 海底ガス資源回収用垂直管に生じる振動管内気液二相流動に関する基礎研究

  林公祐

  (財)関西エネルギー・リサイクル科学研究振興財団, 研究助成：エネルギー・リサイクル分野, Apr. 2019 - Mar. 2020, Principal investigator


• 格子ボルツマン法を用いたMRI単独CFD解析法による脳動脈瘤増大因子の同定

  木村 英仁

  学術研究助成基金助成金／基盤研究(C), Apr. 2017 - Mar. 2020

  Competitive research funding


• 界面活性剤の界面安定化効果を用いた高流量用マイクロ流路内テイラー流生成器の開発

  林 公祐

  学術研究助成基金助成金／基盤研究(C), Apr. 2017 - Mar. 2020, Principal investigator

  Competitive research funding


• Experimental investigation and modeling of adsorption of surfactants on a moving interface

  Hosokawa Shigeo, HAYASHI Kosuke

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2016 - 31 Mar. 2019

  Numerical simulations of contaminated bubbles or drops adopt a model of adsorption-desorption kinetics developed for quiescent systems. However, the model has rarely been validated due to the lack of experimental data of surfactant concentration at a moving interface. Hence, we experimentally investigated surfactant concentration at the moving interface of a spherical drop falling in a stagnant liquid containing surfactant based on the velocity distribution measured by spatiotemporal filter velocimetry (SFV). The applicability of the Frumkin-Levich model to a drop falling in a contaminated system was examined based on the measured data. The result showed that the evaluation of surfactant concentration using SFV is of great use in understanding adsorption-desorption kinetics at an interface in a contaminated system and in validation of adsorption and desorption models. The Frumkin-Levich model is not applicable to a moving interface, whereas it is applicable to an immobile interface.


• 高気相体積率スラリー気泡塔のスケールアップ支援用流動予測技術の開発

  冨山 明男

  科学研究費一部基金／基盤研究(B), Apr. 2015 - Mar. 2018

  Competitive research funding


• 気泡を用いたろ過膜洗浄の計測及び数値シミュレーョンに基づく洗浄速度モデリングに関する研究

  林公祐

  伊藤忠兵衛基金, 学術研究事業助成, Apr. 2015 - Mar. 2016, Principal investigator


• 気泡‐膜間流動の乱流計測と詳細数値予測によるろ過膜洗浄機構の解明

  林 公祐

  学術研究助成基金助成金／若手研究(B), Apr. 2013 - Mar. 2015, Principal investigator

  Competitive research funding


• 天然ガス液体燃料製造工程において触媒粒子が合成ガス気泡合一に及ぼす影響の解明

  林公祐

  (財)関西エネルギー・リサイクル科学研究振興財団, 研究助成：エネルギー・リサイクル分野, Apr. 2012 - Mar. 2013, Principal investigator


• 高粘度スラリー系気泡運動のモデル化と気泡群シミュレーション技術の開発

  林 公祐

  科学研究費補助金／若手研究(B), Apr. 2011 - Mar. 2013, Principal investigator

  Competitive research funding


• 水質汚染環境下気泡の運動に対する汚染物質の影響のモデル化

  林公祐

  (財)ひょうご科学技術協会, 学術研究助成事業, Apr. 2011 - Mar. 2012, Principal investigator


• 配管内キャビテーション損傷対策のための高安全特殊エルボの開発

  林公祐

  (財)油空圧機器技術振興財団, 研究助成事業, Apr. 2009 - Mar. 2010, Principal investigator