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Journal Articles

A Simple Analytical Model to Predict the Freeze Plug Opening Time in Molten Salt Reactors

Muhammad Ilham, Tomio Okawa
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Technical Briefs
ASME J of Nuclear Rad Sci. October 2023, 9(4): 041107.
Paper No: NERS-22-1162
https://doi.org/10.1115/1.4062879
Published Online: July 17, 2023
View Article titled, A Simple Analytical Model to Predict the Freeze Plug Opening Time in Molten Salt Reactors
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Topics: Molten salt reactors, Simulation, Wall thickness, Safety, Computer simulation, Design, Temperature, Heat conduction, Melting, Solidification
Proceedings Papers

Numerical Analysis of Simple Heat Equation to Predict the Opening Time of the Freeze Plug in Molten Salt Reactors

Muhammad Ilham, Tomio Okawa
Proc. ASME. ICONE29, Volume 4: SMRs, Advanced Reactors, and Fusion, V004T04A026, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-92284
https://doi.org/10.1115/ICONE29-92284
View Paper titled, Numerical Analysis of Simple Heat Equation to Predict the Opening Time of the Freeze Plug in Molten Salt Reactors
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Topics: Heat, Molten salt reactors, Numerical analysis
Proceedings Papers

Experiment Study on the Effect of Nozzle Shape on Liquid Jet Breakup

Guofu Sun, Yi Zhan, Tomio Okawa, Mitsuhiro Aoyagi, Akihiro Uchibori, Yasushi Okano
Proc. ASME. ICONE29, Volume 7B: Thermal-Hydraulics and Safety Analysis, V07BT07A032, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-93074
https://doi.org/10.1115/ICONE29-93074
View Paper titled, Experiment Study on the Effect of Nozzle Shape on Liquid Jet Breakup
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Topics: Flow (Dynamics), Nozzles, Shapes
Proceedings Papers

Experimental Study on Measurement of Boiling Entrainment Rate From Falling Liquid Film With Gas Sheared Flow

Raka Firman Baskara Permana, Junpei Tabuchi, Tomio Okawa, Yuki Narushima, Hajime Furuichi, Kenichi Katono
Proc. ASME. ICONE29, Volume 15: Student Paper Competition, V015T16A022, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-90420
https://doi.org/10.1115/ICONE29-90420
View Paper titled, Experimental Study on Measurement of Boiling Entrainment Rate From Falling Liquid Film With Gas Sheared Flow
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Topics: Boiling, Flow (Dynamics), Liquid films, Drops, Heat flux, Two-phase flow, Gas flow, Nucleate boiling, Separation (Technology), Steady state
Journal Articles

Dr. Romney B. Duffey on His 80th Birthday

Igor Pioro, Richard R. Schultz, Dr. Hideki Kamide, Dr. Sama Bilbao y Leon, Dr. Nils Diaz, Alexander V. Bychkov, Dr. Leon Cizelj, Francesco D'Auria, Dr. Yanping Huang, Dr. Yasuo Koizumi, Tomio Okawa, Dr. Robert Walker, Dr. Robert Youngblood, Enrico Zio
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Editorial
ASME J of Nuclear Rad Sci. July 2022, 8(3): 030201.
Paper No: NERS-22-1030
https://doi.org/10.1115/1.4054329
Published Online: May 3, 2022
View Article titled, Dr. Romney B. Duffey on His 80th Birthday
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Topics: Accidents, Design, Electricity (Physics), Governments, Innovation, Japan Society of Mechanical Engineers, Nuclear engineering, Nuclear power, Risk, Safety
Proceedings Papers

Experimental Observation of Nucleate Boiling Entrainment in a Liquid Film

Junpei Tabuchi, Yuki Narushima, Kenichi Katono, Tomio Okawa
Proc. ASME. ICONE28, Volume 4: Student Paper Competition, V004T14A020, August 4–6, 2021
Publisher: American Society of Mechanical Engineers
Paper No: ICONE28-63813
https://doi.org/10.1115/ICONE28-63813
View Paper titled, Experimental Observation of Nucleate Boiling Entrainment in a Liquid Film
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Topics: Liquid films, Nucleate boiling
Proceedings Papers

Numerical Investigation of Safety System Parameters in Molten Salt Reactor: Wall Effect on Freeze Valve Opening Time

Muhammad Ilham, Indarta Kuncoro Aji, Tomio Okawa
Proc. ASME. ICONE28, Volume 1: Operating Plant Challenges, Successes, and Lessons Learned; Nuclear Plant Engineering; Advanced Reactors and Fusion; Small Modular and Micro-Reactors Technologies and Applications, V001T03A003, August 4–6, 2021
Publisher: American Society of Mechanical Engineers
Paper No: ICONE28-64134
https://doi.org/10.1115/ICONE28-64134
View Paper titled, Numerical Investigation of Safety System Parameters in Molten Salt Reactor: Wall Effect on Freeze Valve Opening Time
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Topics: Melting, Molten salt reactors, Safety, Solidification, Valves
Proceedings Papers

Microscopic Heat Transfer Characteristics During Cooling of High Temperature Surface by a Falling Liquid Film

Yutaro Umehara, Tomio Okawa
Proc. ASME. ICONE28, Volume 2: Nuclear Fuels, Research, and Fuel Cycle; Nuclear Codes and Standards; Thermal-Hydraulics, V002T07A003, August 4–6, 2021
Publisher: American Society of Mechanical Engineers
Paper No: ICONE28-61737
https://doi.org/10.1115/ICONE28-61737
View Paper titled, Microscopic Heat Transfer Characteristics During Cooling of High Temperature Surface by a Falling Liquid Film
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Topics: Boiling, Cooling, Heat transfer, High temperature, Liquid films
Proceedings Papers

Prediction of Extremely High Minimum Heat Flux Point During Quenching in Nanofluid

Yutaro Umehara, Tomio Okawa
Proc. ASME. ICONE2020, Volume 3: Student Paper Competition; Thermal-Hydraulics; Verification and Validation, V003T12A001, August 4–5, 2020
Publisher: American Society of Mechanical Engineers
Paper No: ICONE2020-16032
https://doi.org/10.1115/ICONE2020-16032
View Paper titled, Prediction of Extremely High Minimum Heat Flux Point During Quenching in Nanofluid
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Topics: Heat flux, Nanofluids, Quenching (Metalworking)
Journal Articles

Special Section: Selected Papers from ICONE-27

Jovica Riznic, Tomio Okawa, Asif Arastu, Leon Cizelj, Shripad Revankar, Richard Schultz
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Guest Editorial
ASME J of Nuclear Rad Sci. October 2020, 6(4): 040301.
Paper No: NERS-20-1062
https://doi.org/10.1115/1.4047731
Published Online: September 4, 2020
View Article titled, Special Section: Selected Papers from ICONE-27
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Topics: Japan Society of Mechanical Engineers, Mechanical engineers, Nuclear engineering, Radiation (Physics), Students, Nuclear power, Engineers, Governments, Industrial research, Maintenance
Journal Articles

An Experimental and Numerical Study of Wall Effect on Freeze Valve Performance in a Molten Salt Reactor

Indarta Kuncoro Aji, Tokushima Tatsuya, Motoyasu Kinoshita, Tomio Okawa
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Research-Article
ASME J of Nuclear Rad Sci. April 2020, 6(2): 021105.
Paper No: NERS-19-1051
https://doi.org/10.1115/1.4045180
Published Online: January 29, 2020
View Article titled, An Experimental and Numerical Study of Wall Effect on Freeze Valve Performance in a Molten Salt Reactor
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Topics: Cylinders, Molten salt reactors, Temperature, Valves, Brass (Metal), Thermal conductivity, Melting, Computer simulation, Copper, Fuels
Journal Articles

Greetings From JSME and the Report on ICONE27

Tomio Okawa
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Guest Editorial
ASME J of Nuclear Rad Sci. January 2020, 6(1): 010302.
Paper No: NERS-19-1148
https://doi.org/10.1115/1.4045120
Published Online: November 29, 2019
View Article titled, Greetings From JSME and the Report on ICONE27
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Topics: Japan Society of Mechanical Engineers, Nuclear engineering
Proceedings Papers

An Experimental Study on Freeze Valve Performance in a Molten Salt Reactor

Indarta Kuncoro Aji, Tokushima Tatsuya, Motoyasu Kinoshita, Tomio Okawa
Proc. ASME. ICONE26, Volume 9: Student Paper Competition, V009T16A044, July 22–26, 2018
Publisher: American Society of Mechanical Engineers
Paper No: ICONE26-81679
https://doi.org/10.1115/ICONE26-81679
View Paper titled, An Experimental Study on Freeze Valve Performance in a Molten Salt Reactor
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Topics: Molten salt reactors, Valves, Fuels, Melting, Accidents, Metals, Drainage, Mathematics, Numerical analysis, Safety
Proceedings Papers

Modeling of Bubble Behavior in Low Void Fraction Subcooled Flow Boiling

Shintaro Sakamoto, Hiroki Ohori, Koji Enoki, Tomio Okawa
Proc. ASME. ICONE26, Volume 9: Student Paper Competition, V009T16A010, July 22–26, 2018
Publisher: American Society of Mechanical Engineers
Paper No: ICONE26-81173
https://doi.org/10.1115/ICONE26-81173
View Paper titled, Modeling of Bubble Behavior in Low Void Fraction Subcooled Flow Boiling
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Topics: Boiling, Bubbles, Flow (Dynamics), Modeling, Porosity, Subcooling, Computer simulation, Condensation, Engineering simulation, Heat transfer
Proceedings Papers

Experiments on the Splashing Limit During Drop Impact Onto a Thin Liquid Film

Sota Kitabayashi, Koji Enoki, Tomio Okawa
Proc. ASME. ICONE25, Volume 9: Student Paper Competition, V009T15A032, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-67021
https://doi.org/10.1115/ICONE25-67021
View Paper titled, Experiments on the Splashing Limit During Drop Impact Onto a Thin Liquid Film
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Topics: Accidents, Cooling, Dimensionless numbers, Drops, Film thickness, Liquid films, Lubrication theory, Nuclear engineering, Silicones, Sprays
Proceedings Papers

Splash During Liquid Jet Impingement Onto a Horizontal Plate

Yi Zhan, Naoki Oya, Koji Enoki, Tomio Okawa, Shuji Ohno, Mitsuhiro Aoyagi, Takashi Takata
Proc. ASME. ICONE25, Volume 9: Student Paper Competition, V009T15A007, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-66334
https://doi.org/10.1115/ICONE25-66334
View Paper titled, Splash During Liquid Jet Impingement Onto a Horizontal Plate
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Topics: Combustion, Coolants, Drops, Fire, Flow (Dynamics), Jets, Leakage, Liquid films, Nozzles, Numerical analysis
Proceedings Papers

Experimental Study on Splashing During Liquid Jet Impingement Onto a Liquid Film

Zhan Yi, Naoki Oya, Koji Enoki, Tomio Okawa, Shuji Ohno, Mitsuhiro Aoyagi
Proc. ASME. ICONE24, Volume 5: Student Paper Competition, V005T15A001, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60033
https://doi.org/10.1115/ICONE24-60033
View Paper titled, Experimental Study on Splashing During Liquid Jet Impingement Onto a Liquid Film
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Topics: Liquid films, Drops, Nozzles, Sodium, Accidents, Fire, Combustion, Jet engines, Jets, Leakage
Proceedings Papers

Accurate Estimation of Vaporization Rate in Subcooled Flow Boiling Based on the Results of Visualization Experiment

Kazuhiro Kaiho, Koji Enoki, Tomio Okawa
Proc. ASME. ICONE24, Volume 5: Student Paper Competition, V005T15A019, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60318
https://doi.org/10.1115/ICONE24-60318
View Paper titled, Accurate Estimation of Vaporization Rate in Subcooled Flow Boiling Based on the Results of Visualization Experiment
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Topics: Boiling, Flow (Dynamics), Subcooling, Visualization, Bubbles, Nucleation (Physics), Gaussian distribution, Density, Experimental methods, Atmospheric pressure
Proceedings Papers

Numerical Simulation of Subcooled Flow Boiling Using a Bubble Tracking Method

Tomio Okawa, Naoki Miyano, Kazuhiro Kaiho, Koji Enoki
Proc. ASME. ICONE24, Volume 3: Thermal-Hydraulics, V003T09A004, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60088
https://doi.org/10.1115/ICONE24-60088
View Paper titled, Numerical Simulation of Subcooled Flow Boiling Using a Bubble Tracking Method
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Topics: Boiling, Bubbles, Computer simulation, Flow (Dynamics), Subcooling, Porosity, Nucleation (Physics), Simulation
Journal Articles

Enhancing Numerical Stability of a Two-Fluid Model by the Use of Interfacial Pressure Terms

Tomio Okawa
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Research Papers
ASME J of Nuclear Rad Sci. April 2015, 1(2): 021001.
Paper No: NERS-14-1036
https://doi.org/10.1115/1.4029415
Published Online: March 24, 2015
View Article titled, Enhancing Numerical Stability of a Two-Fluid Model by the Use of Interfacial Pressure Terms
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Topics: Boiling, Flow (Dynamics), Fluids, Numerical stability, Pressure, Subcooling, Two-phase flow, Simulation, Bubbles