Prediction of liquid hydrogen flow boiling critical heat flux condition under microgravity based on the wall heat flux partition model |
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| Affiliation: | 1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China;3. Wuhan Second Ship Design and Research Institute, Wuhan 430064, China;1. Department of Energy Science & Technology, Kyoto University, Sakyo-ku, Kyoto, Japan;2. J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, Japan;3. Institute of Advanced Energy, Kyoto University, Uji, Kyoto, Japan;4. Institute of Space and Astronautical Science, JAXA, Kanagawa, Japan;1. Institute of Refrigeration & Cryogenic Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China;1. Propulsion and Propellants Branch, National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135, United States;2. Turbine Durability, Hot Section Engineering, Pratt & Whitney, East Hartford, CT 06118, United States;3. Fluid Physics Branch, National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135, United States;4. National Center for Space Exploration Research, National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135, United States;5. Department of Mechanical and Aeronautical Engineering, University of Florida, Gainesville, FL 32611, United States;1. Dept. of Energy Science and Technology, Kyoto University, Kyoto 606-8501, Japan;2. J-PARC Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan;3. Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan;4. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 229-8510, Japan;1. G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332-0405, Georgia;2. Propulsion System Department, NASA/Marshall Space Flight Center, United States |
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| Abstract: | Critical heat flux (CHF) of liquid hydrogen (LH2) flow boiling under microgravity is vital for designing space cryogenic propellant conveying pipe since the excursion of wall temperature may cause system failure. In this study, a two-dimensional axisymmetric model based on the wall heat flux partition (WHFP) model was proposed to predict the CHF condition under microgravity including the wall temperature and the CHF location. The proposed numerical model was validated to demonstrate a good agreement between the simulated and experimentally reported results. Then, the wall temperature distribution and the CHF location under different gravity conditions were compared. In addition, the WHFP and vapor-liquid distribution along the wall under microgravity were predicted and its difference with terrestrial gravity condition was also analysed and reported. Finally, the effects of flow velocity and inlet sub-cooling on the wall temperature distributions were analysed under microgravity and terrestrial gravity conditions, respectively. The results indicate that the CHF location moves upstream about 5.25 m from 1g to 10−4g since the void fraction near the wall reaches the breakpoint of CHF condition much earlier under the microgravity condition. Furthermore, the increase of the velocity and decrease of the sub-cooling have smaller effects on the CHF location during LH2 flow boiling under microgravity. |
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| Keywords: | Liquid hydrogen Flow boiling Critical heat flux Microgravity Wall heat flux partition Numerical study |
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