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Akimaro Kawahara
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Proceedings Papers

Pressure Drop for Single- and Two-Phase Flows Through a Return Bend in Horizontal Rectangular Microchannel and Minichannel

Akimaro Kawahara, Michio Sadatomi, Shinichi Miyagawa, Mohamed H. Mansour
Proc. ASME. ICNMM2015, ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, V001T04A068, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: ICNMM2015-48721
https://doi.org/10.1115/ICNMM2015-48721
View Paper titled, Pressure Drop for Single- and Two-Phase Flows Through a Return Bend in Horizontal Rectangular Microchannel and Minichannel
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Topics: Microchannels, Pressure drop, Two-phase flow, Pressure, Ethanol, Flow (Dynamics), Nitrogen, Surfactants, Water
Proceedings Papers

Investigation of Characteristics of Gas-Liquid Two-Phase Flows in a Rectangular Microchannel With Return Bends

Akimaro Kawahara, Michio Sadatomi, Hideki Matsuo, Satoshi Shimokawa
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 2461-2471, July 24–29, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJK2011-10011
https://doi.org/10.1115/AJK2011-10011
View Paper titled, Investigation of Characteristics of Gas-Liquid Two-Phase Flows in a Rectangular Microchannel With Return Bends
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Topics: Microchannels, Two-phase flow, Bubbles, Porosity, Ethanol, Slug flows, Flow (Dynamics), Junctions, Nitrogen, Scaling laws (Mathematical physics)
Proceedings Papers

Study of Interfacial Friction Force for Bubble Flows in a 2×1 Rods Channel Simplifying BWR

Akimaro Kawahara, Michio Sadatomi, Yutaro Nakamoto, Takatoshi Masuda
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 4, Parts A and B, 1243-1252, May 17–21, 2010
Publisher: American Society of Mechanical Engineers
Paper No: ICONE18-30270
https://doi.org/10.1115/ICONE18-30270
View Paper titled, Study of Interfacial Friction Force for Bubble Flows in a 2×1 Rods Channel Simplifying BWR
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Topics: Boiling water reactors, Bubbly flow, Friction, Rods, Drag (Fluid dynamics), Water, Bubbles, Constitutive equations, Dimensionless numbers, Flow (Dynamics)
Journal Articles

Study of Interfacial Friction Force for Bubble Flows in a 2 × 1 Rod Channel Simplifying BWR

Akimaro Kawahara, Michio Sadatomi, Yutaro Nakamoto, Takatoshi Masuda
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2011, 133(5): 052905.
https://doi.org/10.1115/1.4002404
Published Online: December 13, 2010
View Articletitled, Study of Interfacial Friction Force for Bubble Flows in a 2 × 1 Rod Channel Simplifying BWR
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Topics: Bubbles, Bubbly flow, Drag (Fluid dynamics), Friction, Flow (Dynamics), Porosity, Fluids, Water
Proceedings Papers

Characteristics of Two-Phase Flows in a Rectangular Microchannel With a T-Junction Type Gas-Liquid Mixer

Akimaro Kawahara, Michio Sadatomi, Keitaro Nei, Hideki Matsuo, Takatoshi Masuda
Proc. ASME. ICNMM2009, ASME 2009 7th International Conference on Nanochannels, Microchannels and Minichannels, 1133-1140, June 22–24, 2009
Publisher: American Society of Mechanical Engineers
Paper No: ICNMM2009-82217
https://doi.org/10.1115/ICNMM2009-82217
View Paper titled, Characteristics of Two-Phase Flows in a Rectangular Microchannel With a T-Junction Type Gas-Liquid Mixer
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Topics: Junctions, Microchannels, Two-phase flow, Bubbles, Porosity, Pressure drop, Ethanol, Flow (Dynamics), Friction, Nitrogen
Proceedings Papers

Effects of Surface Tension on Two-Phase Void Drift Between Triangle Tight Lattice Subchannels

Akimaro Kawahara, Michio Sadatomi, Tatsuya Higuchi
Proc. ASME. ICONE16, Volume 3: Thermal Hydraulics; Instrumentation and Controls, 569-578, May 11–15, 2008
Publisher: American Society of Mechanical Engineers
Paper No: ICONE16-48574
https://doi.org/10.1115/ICONE16-48574
View Paper titled, Effects of Surface Tension on Two-Phase Void Drift Between Triangle Tight Lattice Subchannels
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Topics: Surface tension, Flow (Dynamics), Fluids, Water, Constitutive equations, Diffusion (Physics), Friction, Fuel rods, Nonequilibrium flow, Surfactants
Proceedings Papers

Effects of Liquid Properties on Pressure Drop of Two-Phase Gas-Liquid Flows Through a Microchannel

Akimaro Kawahara, Michio Sadatomi, Kazuya Okayama, Masahiro Kawaji
Proc. ASME. ICMM2003, 1st International Conference on Microchannels and Minichannels, 479-486, April 24–25, 2003
Publisher: American Society of Mechanical Engineers
Paper No: ICMM2003-1058
https://doi.org/10.1115/ICMM2003-1058
View Paper titled, Effects of Liquid Properties on Pressure Drop of Two-Phase Gas-Liquid Flows Through a Microchannel
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Topics: Flow (Dynamics), Microchannels, Pressure drop, Water, Ethanol, Two-phase flow, Friction, Nitrogen, Reynolds number, Surface tension
Proceedings Papers

Characteristics of Single-Phase Flow in Microchannels

Peter M.-Y. Chung, Masahiro Kawaji, Akimaro Kawahara
Proc. ASME. FEDSM2002, Volume 1: Fora, Parts A and B, 1219-1228, July 14–18, 2002
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2002-31211
https://doi.org/10.1115/FEDSM2002-31211
View Paper titled, Characteristics of Single-Phase Flow in Microchannels
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Topics: Flow (Dynamics), Microchannels, Compressibility, Friction, Reynolds number, Boundary-value problems, Density, Gas flow, Glass, Laminar flow
Proceedings Papers

Prediction of Flow Distribution in Gas-Liquid Two-Phase Annular Flows in a Rod Bundle Under Hydraulically Equilibrium Condition

Akimaro Kawahara, Michio Sadatomi, Nobutaka Aoyama, Satoru Tanoue
Proc. ASME. FEDSM2003, Volume 1: Fora, Parts A, B, C, and D, 1399-1406, July 6–10, 2003
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2003-45369
https://doi.org/10.1115/FEDSM2003-45369
View Paper titled, Prediction of Flow Distribution in Gas-Liquid Two-Phase Annular Flows in a Rod Bundle Under Hydraulically Equilibrium Condition
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Topics: Equilibrium (Physics), Flow (Dynamics), Fuel rods, Boiling water reactors, Fluids, Pressure, Shear (Mechanics), Stress, Two-phase flow
Proceedings Papers

Flow Distribution and Slug Flow Characteristics for Hydraulically Equilibrium Air-Water Two-Phase Flows in a Vertical 2×3 Rod Channel

Keiko Kano, Michio Sadatomi, Akimaro Kawahara, Tsukasa Kuno
Proc. ASME. FEDSM2003, Volume 1: Fora, Parts A, B, C, and D, 1407-1414, July 6–10, 2003
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2003-45370
https://doi.org/10.1115/FEDSM2003-45370
View Paper titled, Flow Distribution and Slug Flow Characteristics for Hydraulically Equilibrium Air-Water Two-Phase Flows in a Vertical 2×3 Rod Channel
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Topics: Equilibrium (Physics), Flow (Dynamics), Slug flows, Two-phase flow, Water, Bubbles, Fuel rods, Boiling water reactors, Coolants, Fluids
Proceedings Papers

Two-Phase Flow Through Square and Circular Microchannels: Effect of Channel Geometry

Peter M.-Y. Chung, Masahiro Kawaji, Akimaro Kawahara, Yuichi Shibata
Proc. ASME. FEDSM2003, Volume 1: Fora, Parts A, B, C, and D, 1459-1467, July 6–10, 2003
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2003-45377
https://doi.org/10.1115/FEDSM2003-45377
View Paper titled, Two-Phase Flow Through Square and Circular Microchannels: Effect of Channel Geometry
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Topics: Geometry, Microchannels, Two-phase flow
Proceedings Papers

Effect of Channel Diameter and Liquid Property on Void Fraction in Adiabatic Two-Phase Flow Through Microchannels

Masahiro Kawaji, Akimaro Kawahara, Peter M.-Y. Chung, Michio Sadatomi, Kazuya Okayama
Proc. ASME. ICMM2004, ASME 2nd International Conference on Microchannels and Minichannels, 381-388, June 17–19, 2004
Publisher: American Society of Mechanical Engineers
Paper No: ICMM2004-2359
https://doi.org/10.1115/ICMM2004-2359
View Paper titled, Effect of Channel Diameter and Liquid Property on Void Fraction in Adiabatic Two-Phase Flow Through Microchannels
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Topics: Microchannels, Porosity, Two-phase flow, Water, Ethanol, Nitrogen, Fluids, Surface tension, Viscosity
Proceedings Papers

Assessment of Void Fraction Correlations for Adiabatic Two-Phase Flows in Microchannels

Akimaro Kawahara, Michio Sadatomi, Masahiro Kawaji, Kazuya Okayama, P. M.-Y. Chung
Proc. ASME. ICMM2005, ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B, 561-568, June 13–15, 2005
Publisher: American Society of Mechanical Engineers
Paper No: ICMM2005-75031
https://doi.org/10.1115/ICMM2005-75031
View Paper titled, Assessment of Void Fraction Correlations for Adiabatic Two-Phase Flows in Microchannels
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Topics: Microchannels, Porosity, Two-phase flow
Journal Articles

Effects of Surface Tension on Two-Phase Void Drift Between Triangle Tight Lattice Subchannels

Akimaro Kawahara, Michio Sadatomi, Tatsuya Higuchi
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2009, 131(1): 012903.
https://doi.org/10.1115/1.2983083
Published Online: October 2, 2008
View Articletitled, Effects of Surface Tension on Two-Phase Void Drift Between Triangle Tight Lattice Subchannels
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Topics: Flow (Dynamics), Friction, Surface tension, Water, Fluids, Two-phase flow, Diffusion (Physics), Porosity
Proceedings Papers

Single- and Two-Phase Diversion Cross-Flows Between Triangle Tight Lattice Rod Bundle Subchannels: Data on Flow Resistance and Interfacial Friction Coefficients for the Cross-Flow

Tatsuya Higuchi, Akimaro Kawahara, Michio Sadatomi, Hiroyuki Kudo
Proc. ASME. ICONE14, Volume 4: Computational Fluid Dynamics, Neutronics Methods and Coupled Codes; Student Paper Competition, 547-554, July 17–20, 2006
Publisher: American Society of Mechanical Engineers
Paper No: ICONE14-89215
https://doi.org/10.1115/ICONE14-89215
View Paper titled, Single- and Two-Phase Diversion Cross-Flows Between Triangle Tight Lattice Rod Bundle Subchannels: Data on Flow Resistance and Interfacial Friction Coefficients for the Cross-Flow
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Topics: Cross-flow, Flow (Dynamics), Friction, Fuel rods, Pressure, Two-phase flow, Atmospheric pressure, Fluids, Momentum, Porosity
Proceedings Papers

Measurement and Analysis of Void Fraction in a Multiple-Channel Simplifying Triangle Tight Lattice Rod Bundle

Michio Sadatomi, Akimaro Kawahara, Hiroyuki Kudo, Hiroshi Shirai
Proc. ASME. ICONE14, Volume 2: Thermal Hydraulics, 235-242, July 17–20, 2006
Publisher: American Society of Mechanical Engineers
Paper No: ICONE14-89224
https://doi.org/10.1115/ICONE14-89224
View Paper titled, Measurement and Analysis of Void Fraction in a Multiple-Channel Simplifying Triangle Tight Lattice Rod Bundle
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Topics: Fuel rods, Porosity, Water, Friction, Flow (Dynamics), Surface tension, Surfactants, Constitutive equations, Liquid films, Pipe flow
Journal Articles

Two-Phase Flow Through Square and Circular Microchannels—Effects of Channel Geometry

Peter M.-Y. Chung, Masahiro Kawaji, Akimaro Kawahara, Yuichi Shibata
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2004, 126(4): 546–552.
https://doi.org/10.1115/1.1777227
Published Online: September 10, 2004
View Articletitled, Two-Phase Flow Through Square and Circular Microchannels—Effects of Channel Geometry
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Topics: Flow (Dynamics), Microchannels, Two-phase flow, Pressure drop, Porosity, Geometry, Water