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Forced flow boiling heat transfer of liquid hydrogen for superconductor cooling |
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| Authors: | Yasuyuki Shirai Hideki Tatsumoto Masahiro Shiotsu Koichi Hata Hiroaki Kobayashi Yoshihiro Naruo Yoshifumi Inatani Katsuhiro Kinoshita |
| Affiliation: | aDept. of Energy Science and Technology, Kyoto University, Kyoto 606-8501, Japan;bJ-PARC Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan;cInstitute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan;dInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 229-8510, Japan;eThe Kansai Electric Power Co. Inc., Amagasaki, Hyogo 661-0974, Japan |
| Abstract: | Heat transfer from inner side of a heated vertical pipe to liquid hydrogen flowing upward was first measured at the pressure of 0.7 MPa for wide ranges of flow rates and liquid temperatures. The heat transfer coefficients in non-boiling regime for each flow velocity were well in agreement with the Dittus–Boelter equation. The heat fluxes at the inception of boiling and the departure from nucleate boiling (DNB) heat fluxes are higher for higher flow velocity and subcooling. It was found that the trend of dependence of the DNB heat flux on flow velocity was expressed by the correlation derived by Hata et al. based on their data for subcooled flow boiling of water, although it has different propensity to subcooling. |
| Keywords: | Hydrogen (B) Heat transfer (C) Forced flow (C) Phase transitions (C) |
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