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Nobuyuki Takenaka
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Proceedings Papers

Flow Pattern of Gas-Liquid Two-Phase Annular Flow in a Spiral Tube

Hitoshi Asano, Nobuyuki Takenaka, Terushige Fujii, Tetsuya Arakawa, Masahito Matsubayashi
Proc. ASME. IMECE98, Heat Transfer: Volume 5 — Numerical and Experimental Methods in Heat Transfer, 297-304, November 15–20, 1998
Paper No: IMECE1998-0747
DOI: https://doi.org/10.1115/IMECE1998-0747
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Topics: Flow (Dynamics), Centrifugal force, Aluminum tube, Gravity (Force), Image processing, Neutron radiography, Porosity, Two-phase flow, Water
Proceedings Papers

Development of Ultrasonic Flowmeter Using Pulsed Doppler Method With Staggered Trigger Pulse

Hideki Murakawa, Ei Muramatsu, Katsumi Sugimoto, Nobuyuki Takenaka, Noriyuki Furuichi
Proc. ASME. AJKFluids2015, Volume 2A: Fora, Part 2, V02AT10A003, July 26–31, 2015
Paper No: AJKFluids2015-10137
DOI: https://doi.org/10.1115/AJKFluids2015-10137
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Topics: Flow (Dynamics), Flow measurement, Flowmeters, Pipes, Transducers, Ultrasonic transducers, Velocity measurement, Waves
Proceedings Papers

Numerical Evaluation of Wall Temperature Measurement Methods Developed to Investigate Thermal Fatigue at T-Junction Pipe

Koji Miyoshi, Akira Nakamura, Nobuyuki Takenaka
Proc. ASME. ICONE20-POWER2012, Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries, 55-64, July 30–August 3, 2012
Paper No: ICONE20-POWER2012-54093
DOI: https://doi.org/10.1115/ICONE20-POWER2012-54093
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Topics: Computer simulation, Fatigue, Junctions, Pipes, Temperature, Thermocouples, Wall temperature
Proceedings Papers

Effect of Frequency Analysis Algorithms on Velocity Data Using Ultrasonic Doppler Method

Ryosuke Sakagami, Hideki Murakawa, Katsumi Sugimoto, Nobuyuki Takenaka
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 2773-2780, July 24–29, 2011
Paper No: AJK2011-11021
DOI: https://doi.org/10.1115/AJK2011-11021
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Topics: Algorithms, Fast Fourier transforms, Flow (Dynamics), Lasers, Particulate matter, Spectral energy distribution, Ultrasonic waves, Velocimeters, Velocity measurement, Waves
Proceedings Papers

Three-Dimensional Visualization of Water Behavior in Polymer Electrolyte Fuel Cell by Using Neutron Radiography

Michinori Hashimoto, Hideki Murakawa, Katsumi Sugimoto, Hitoshi Asano, Nobuyuki Takenaka, Koh-ichi Mochiki
Proc. ASME. POWER2011, ASME 2011 Power Conference, Volume 2, 427-432, July 12–14, 2011
Paper No: POWER2011-55376
DOI: https://doi.org/10.1115/POWER2011-55376
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Topics: Electrolytes, Fuel cells, Neutron radiography, Polymers, Visualization, Water, Neutrons, Automobiles, Energy generation, Fuels
Proceedings Papers

Results of a Steam-Water Experiment Simulating Two-Phase Flow in Pressurizer Spray Piping

Toru Oumaya, Akira Nakamura, Nobuyuki Takenaka
Proc. ASME. ICONE17, Volume 3: Thermal Hydraulics; Current Advanced Reactors: Plant Design, Construction, Workforce and Public Acceptance, 479-486, July 12–16, 2009
Paper No: ICONE17-75582
DOI: https://doi.org/10.1115/ICONE17-75582
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Topics: Pipes, Sprays, Steam, Two-phase flow, Water, Flow (Dynamics), Temperature, Atmospheric pressure, Condensation, Heat transfer coefficients
Proceedings Papers

Visualization and Measurement of Dynamic Water Behavior in PEFC by Neutron Radiography

Tadanobu Ueda, Nobuyuki Takenaka, Hitoshi Asano, Kazumi Tanimoto, Ko-Ichi Mochiki, Yuji Kawabata, Masahito Matsubayashi
Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 2, 93-99, July 8–12, 2007
Paper No: HT2007-32966
DOI: https://doi.org/10.1115/HT2007-32966
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Topics: Neutron radiography, Visualization, Water, Fuel cells, Water distribution, Condensation, Design, Fluctuations (Physics), Hydrogen, Image processing
Proceedings Papers

The Visualization of the Flow in Pressurizer Spray Line Piping and Estimation of Thermal Stress Fluctuation Caused by the Swaying of Water Surface

Toru Oumaya, Akira Nakamura, Nobuyuki Takenaka
Proc. ASME. ICONE16, Volume 4: Structural Integrity; Next Generation Systems; Safety and Security; Low Level Waste Management and Decommissioning; Near Term Deployment: Plant Designs, Licensing, Construction, Workforce and Public Acceptance, 251-259, May 11–15, 2008
Paper No: ICONE16-48809
DOI: https://doi.org/10.1115/ICONE16-48809
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Topics: Flow (Dynamics), Pipes, Sprays, Thermal stresses, Visualization, Water, Steam, Atmospheric pressure, Condensation, Construction
Proceedings Papers

Thermal Stress Evaluation of a Closed Branch Pipe Connected to Reactor Coolant Loop

Toru Oumaya, Akira Nakamura, Nobuyuki Takenaka, Daisuke Onojima
Proc. ASME. ICONE14, Volume 3: Structural Integrity; Nuclear Engineering Advances; Next Generation Systems; Near Term Deployment and Promotion of Nuclear Energy, 279-287, July 17–20, 2006
Paper No: ICONE14-89799
DOI: https://doi.org/10.1115/ICONE14-89799
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Topics: Nuclear reactor coolants, Pipes, Thermal stresses