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Hiroyasu Ohtake
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Proceedings Papers

Study on Propagative Collapse of a Vapor Film of Film Boiling: Effects of Liquid Subcoolings on Characteristics of Propagative Collapse

Yasuyoshi Sakamoto, Hiroyasu Ohtake, Yasuo Koizumi
Proc. ASME. IMECE97, Heat Transfer: Volume 1, 159-165, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0841
https://doi.org/10.1115/IMECE1997-0841
View Paper titled, Study on Propagative Collapse of a Vapor Film of Film Boiling: Effects of Liquid Subcoolings on Characteristics of Propagative Collapse
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Topics: Collapse, Film boiling, Vapors, Temperature, Water, Atmospheric pressure, Platinum, Subcooling, Wire
Proceedings Papers

Study on Forced-Convective Film-Boiling Heat Transfer: Effects of Liquid Flow on a State of Vapor Film Flow

Hidemasa Sasaki, Hiroyasu Ohtake, Yasuo Koizumi
Proc. ASME. IMECE97, Heat Transfer: Volume 1, 167-176, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0842
https://doi.org/10.1115/IMECE1997-0842
View Paper titled, Study on Forced-Convective Film-Boiling Heat Transfer: Effects of Liquid Flow on a State of Vapor Film Flow
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Topics: Film boiling, Film flow, Flow (Dynamics), Heat transfer, Vapors, Pipes, Glass, Heat transfer coefficients, Subcooling, Borosilicate glasses
Proceedings Papers

Study on Subcooled-Forced Flow Boiling Heat Transfer and Critical Heat Flux of Solid-Water Two-Phase Mixture

Yasuo Koizumi, Hiroyasu Ohtake, Manabu Mochizuki
Proc. ASME. IMECE99, Heat Transfer: Volume 2, 327-333, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-1044
https://doi.org/10.1115/IMECE1999-1044
View Paper titled, Study on Subcooled-Forced Flow Boiling Heat Transfer and Critical Heat Flux of Solid-Water Two-Phase Mixture
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Topics: Boiling, Critical heat flux, Flow (Dynamics), Heat transfer, Subcooling, Water, Particulate matter, Bubbles, Condensation, Heat
Proceedings Papers

Study on Enhancement of Critical Heat Flux by Supplying Liquid-Jets to Heating Surface

Hiroyasu Ohtake, Noriyuki Yamamoto, Yasuo Koizumi
Proc. ASME. IMECE99, Heat Transfer: Volume 2, 321-326, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-1043
https://doi.org/10.1115/IMECE1999-1043
View Paper titled, Study on Enhancement of Critical Heat Flux by Supplying Liquid-Jets to Heating Surface
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Topics: Critical heat flux, Heating, Jets, Nozzles, Flow (Dynamics), Copper, Heat, Pool boiling, Water
Proceedings Papers

Study on Enhancement of Critical Heat Flux by Supplying Liquid-Jets to Heating Surface: Mechanism on Enhancement of CHF and Measurement of Void Fraction Near Heating Surface

Hiroyasu Ohtake, Kun Liu, Yasuo Koizumi
Proc. ASME. IMECE2001, Heat Transfer: Volume 2 — Heat Transfer in Multiphase Systems, 219-225, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/HTD-24171
https://doi.org/10.1115/IMECE2001/HTD-24171
View Paper titled, Study on Enhancement of Critical Heat Flux by Supplying Liquid-Jets to Heating Surface: Mechanism on Enhancement of CHF and Measurement of Void Fraction Near Heating Surface
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Topics: Critical heat flux, Heating, Jets, Porosity, Flow (Dynamics), Nozzles, Copper, Heat, Heat flux, Pool boiling
Proceedings Papers

Heat Transfer and Critical Heat Flux of Forced Flow Boiling in Vertical-Narrow-Annular Passages

Yasuo Koizumi, Hiroyasu Ohtake, Yosinobu Fujita
Proc. ASME. IMECE2001, Heat Transfer: Volume 3 — Fluid-Physics and Heat Transfer for Macro- and Micro-Scale Gas-Liquid and Phase-Change Flows, 227-234, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/HTD-24219
https://doi.org/10.1115/IMECE2001/HTD-24219
View Paper titled, Heat Transfer and Critical Heat Flux of Forced Flow Boiling in Vertical-Narrow-Annular Passages
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Topics: Boiling, Critical heat flux, Flow (Dynamics), Heat transfer, Clearances (Engineering), Bubbles, Heat flux, Wall temperature, Flux (Metallurgy), Forced convection
Proceedings Papers

Study on the Behavior of a Wetted Area Right After Liquid-Wall Contact in Pool Film Boiling

Hiroyasu Ohtake, Hiroyuki Satoh, Yasuo Koizumi
Proc. ASME. IMECE2000, Heat Transfer: Volume 4, 65-69, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1507
https://doi.org/10.1115/IMECE2000-1507
View Paper titled, Study on the Behavior of a Wetted Area Right After Liquid-Wall Contact in Pool Film Boiling
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Topics: Film boiling, Temperature, Superheating, Vapors, Collapse, Wall temperature, Water, Wire, Atmospheric pressure, Nozzles
Proceedings Papers

Characteristics of a Falling Liquid Film on the Outer Surface of a Vertical Pipe: Minimum Wetting Rates and Waves on the Film

Yasuo Koizumi, Hiroyasu Ohtake, Shinichi Ikeda
Proc. ASME. IMECE2000, Heat Transfer: Volume 2, 197-203, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1428
https://doi.org/10.1115/IMECE2000-1428
View Paper titled, Characteristics of a Falling Liquid Film on the Outer Surface of a Vertical Pipe: Minimum Wetting Rates and Waves on the Film
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Topics: Liquid films, Pipes, Waves, Wetting, Film thickness, Flow (Dynamics), Reynolds number, Surface tension, Symmetry (Physics), Thin films
Proceedings Papers

Effect of Thin Metal Film and Micro Structure of Surface on Condensation Pattern

Tomohito Nishimura, Yuki Mikoshiba, Hiroyasu Ohtake, Koji Hasegawa
Proc. ASME. ICONE25, Volume 9: Student Paper Competition, V009T15A038, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-67239
https://doi.org/10.1115/ICONE25-67239
View Paper titled, Effect of Thin Metal Film and Micro Structure of Surface on Condensation Pattern
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Topics: Condensation, Metallic films, Metals, Microelectromechanical systems, Thin films, Atomic force microscopy, Water, Condensers (steam plant), Durability, Etching
Proceedings Papers

Boiling Heat Transfer Characteristics and Film Boiling Collapse Temperature Through the Two-Dimensional Temperature Field Measurement: Examination of Condition in High Liquid Subcooling Condition

Hajime Takeuchi, Hiroyasu Ohtake, Masahiro Ueno, Hiroshi Washida, Koji Hasegawa
Proc. ASME. ICONE24, Volume 5: Student Paper Competition, V005T15A046, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60644
https://doi.org/10.1115/ICONE24-60644
View Paper titled, Boiling Heat Transfer Characteristics and Film Boiling Collapse Temperature Through the Two-Dimensional Temperature Field Measurement: Examination of Condition in High Liquid Subcooling Condition
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Topics: Boiling, Collapse, Film boiling, Heat transfer, Subcooling, Temperature, Silver, Sputtering (Irradiation), Superheating, Thermometers
Proceedings Papers

Pressure Loss of Water Flow and Flow Boiling Heat Transfer in Microtubes

Takeya Okamoto, Hiroyasu Ohtake, Koji Hasegawa
Proc. ASME. ICNMM2015, ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, V001T04A059, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: ICNMM2015-48325
https://doi.org/10.1115/ICNMM2015-48325
View Paper titled, Pressure Loss of Water Flow and Flow Boiling Heat Transfer in Microtubes
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Topics: Boiling, Flow (Dynamics), Heat transfer, Pressure, Water, Temperature, Critical heat flux, Laminar flow, Heat flux, Wall temperature
Proceedings Papers

Effect of Pressure on Boiling Heat Transfer Mechanism by Using MEMS Technology

Kei Oda, Hiroyasu Ohtake, Koji Hasegawa
Proc. ASME. ICONE22, Volume 5: Innovative Nuclear Power Plant Design and New Technology Application; Student Paper Competition, V005T17A042, July 7–11, 2014
Publisher: American Society of Mechanical Engineers
Paper No: ICONE22-30558
https://doi.org/10.1115/ICONE22-30558
View Paper titled, Effect of Pressure on Boiling Heat Transfer Mechanism by Using MEMS Technology
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Topics: Boiling, Heat transfer, Microelectromechanical systems, Pressure, Bubbles, Convection, Cavities, Semiconductor wafers, Copper, Heating
Proceedings Papers

Experimental Study on Model Development for Liquid Accumulation in Steam Generator U-Tube (First Report) Condensing Counter-Current Flow in Single Vertical Pipe

Tatsuya Yamaji, Kohei Yamazaki, Yasuo Koizumi, Hiroyasu Ohtake, Koji Hasegawa, Shota Araki, Akira Ohnuki, Hiroaki Nishi
Proc. ASME. ICONE22, Volume 5: Innovative Nuclear Power Plant Design and New Technology Application; Student Paper Competition, V005T17A043, July 7–11, 2014
Publisher: American Society of Mechanical Engineers
Paper No: ICONE22-30568
https://doi.org/10.1115/ICONE22-30568
View Paper titled, Experimental Study on Model Development for Liquid Accumulation in Steam Generator U-Tube (First Report) Condensing Counter-Current Flow in Single Vertical Pipe
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Topics: Boilers, Flow (Dynamics), Model development, Pipes, Water, Steam, Accidents, Coolants, Drainage, Film flow
Proceedings Papers

Study on Pressure Loss of Two Phase Flow and Flow Boiling Heat Transfer in Micro Channel

Yu Kadoguchi, Hiroyasu Ohtake
Proc. ASME. ICONE21, Volume 6: Beyond Design Basis Events; Student Paper Competition, V006T16A035, July 29–August 2, 2013
Publisher: American Society of Mechanical Engineers
Paper No: ICONE21-16329
https://doi.org/10.1115/ICONE21-16329
View Paper titled, Study on Pressure Loss of Two Phase Flow and Flow Boiling Heat Transfer in Micro Channel
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Topics: Boiling, Flow (Dynamics), Heat transfer, Microchannels, Pressure, Two-phase flow, Pipes, Temperature, Clearances (Engineering), Critical heat flux
Proceedings Papers

Study on Condensation Heat Transfer on Micro Structured Surfaces (Effect on Condensation Heat Transfer of Metal Sputtering Surfaces)

Kohei Yamazaki, Hiroyasu Ohtake, Koji Hasegawa
Proc. ASME. ICONE21, Volume 6: Beyond Design Basis Events; Student Paper Competition, V006T16A034, July 29–August 2, 2013
Publisher: American Society of Mechanical Engineers
Paper No: ICONE21-16315
https://doi.org/10.1115/ICONE21-16315
View Paper titled, Study on Condensation Heat Transfer on Micro Structured Surfaces (Effect on Condensation Heat Transfer of Metal Sputtering Surfaces)
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Topics: Condensation, Heat transfer, Metals, Sputtering (Irradiation), Copper, Film condensation, Metal surfaces, Metallic films, Mirrors, Heat transfer coefficients
Proceedings Papers

Study on Saturated Flow Boiling Heat Transfer Under Vibration Conditions

Yoshitaro Fujiyama, Hiroyasu Ohtake
Proc. ASME. ICONE20-POWER2012, Volume 5: Fusion Engineering; Student Paper Competition; Design Basis and Beyond Design Basis Events; Simple and Combined Cycles, 521-527, July 30–August 3, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICONE20-POWER2012-55060
https://doi.org/10.1115/ICONE20-POWER2012-55060
View Paper titled, Study on Saturated Flow Boiling Heat Transfer Under Vibration Conditions
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Topics: Boiling, Flow (Dynamics), Heat transfer, Vibration, Critical heat flux, Heating, Subcooling, Bubbles, Copper, Earthquakes
Proceedings Papers

Study on Gas Entrainment Rate Into Liquid From Free Surface by Vortex

Yasuo Koizumi, Kei Ito, Hiroyuki Ohshima, Hiroyasu Ohtake
Proc. ASME. IMECE2010, Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B, 837-842, November 12–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2010-39587
https://doi.org/10.1115/IMECE2010-39587
View Paper titled, Study on Gas Entrainment Rate Into Liquid From Free Surface by Vortex
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Topics: Vortices, Vessels, Bubbles, Water, Flow (Dynamics), Bubbly flow, Pipes, Video cameras
Proceedings Papers

Rising Velocity of a Gas Plug in Vertical-Rectangular-Narrow Channels

Tohru Miyashita, Yasuo Koizumi, Hiroyasu Ohtake
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 4, Parts A and B, 1223-1228, May 17–21, 2010
Publisher: American Society of Mechanical Engineers
Paper No: ICONE18-30235
https://doi.org/10.1115/ICONE18-30235
View Paper titled, Rising Velocity of a Gas Plug in Vertical-Rectangular-Narrow Channels
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Topics: Bubbles, Film thickness, Flow (Dynamics), Pipes, Shapes, Water
Proceedings Papers

Image Analysis of Carry-Under by Falling Liquid Flow

Tomohiko Ohtsuka, Naoki Haraguchi, Hiroyasu Ohtake, Yasuo Koizumi
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 2, 645-649, May 17–21, 2010
Publisher: American Society of Mechanical Engineers
Paper No: ICONE18-29631
https://doi.org/10.1115/ICONE18-29631
View Paper titled, Image Analysis of Carry-Under by Falling Liquid Flow
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Topics: Flow (Dynamics), Water, Waves, Nozzles, Bubbles, Video cameras
Proceedings Papers

Study on Subcooled Flow Boiling Heat Transfer Under Vibration Conditions of Sinusoids and Seismic Shock Waves

Hiroyasu Ohtake, Takehiko Mazume, Yasuo Koizumi
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 4, Parts A and B, 1117-1123, May 17–21, 2010
Publisher: American Society of Mechanical Engineers
Paper No: ICONE18-30180
https://doi.org/10.1115/ICONE18-30180
View Paper titled, Study on Subcooled Flow Boiling Heat Transfer Under Vibration Conditions of Sinusoids and Seismic Shock Waves
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Topics: Boiling, Flow (Dynamics), Heat transfer, Shock waves, Subcooling, Vibration, Critical heat flux, Earthquakes, Bubbles, Copper