Evaporative heat transfer model of a loop heat pipe with bidisperse wick structure |
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Authors: | Fang-Chou Lin Bing-Han Liu Chi-Ting Huang Yau-Ming Chen |
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Affiliation: | 1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;2. Department of Material Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China |
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Abstract: | A mathematical model of evaporative heat transfer in a loop heat pipe was developed and compared with experiments. The steady-state thermal performance was predicted for different sintered nickel wicks, including monoporous and bidisperse structures. The effect of wick pore size distribution on heat transfer was taken into consideration. The wick in the evaporator was assumed to possess three regions during vaporization from an applied heat load: a vapor blanket, a two-phase region, and a saturated liquid region. The evaporator wall temperature and the total thermal resistance at different heat loads were predicted using ammonia as the working fluid. The predictions showed distinct heat transfer characteristics and higher performance for the bidisperse wick in contrast with monoporous wick. A bidisperse wick was able to decrease the thickness of the vapor blanket region, which presents a thermal resistance and causes lower heat transfer capacity of the evaporator. Additionally, a validation test presented good agreement with the experiments. |
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