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Experimental Study on cooling down Process of a Nitrogen-Charged Cryogenic Loop Heat Pipe

Journal of Thermal Science 2023年第1期32卷 153-165页

作者： ZHAO Ya'nan YAN Tao LIANG Jingtao Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academyof SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Cryogenic loop heat pipes are highly efficient heat transfer devices at cryogenic temperature range,which have promising application prospects in satellites,spacecrafts,electronics,and so *** down process is a most critical process for a CLHP before *** present,secondary loop is a major way for a CLHP to fulfil cooling down and most studies are concentrated on heat transfer characteristics during normal ***,few investigations have been carried out on the cooling down *** this paper,the cooling down process of a nitrogen-charged CLHP assisted with a secondary loop was experimentally investigated.A simple qualitative approach to estimate the cooling down time was proposed according to the law of conservation of *** two flow paths of the working fluid in the CLHP during the cooling down process were *** studies on the cooling down process with various secondary heat loads and working fluid inventory were presented in *** the increase of secondary heat load,the elapsed time of Stage III decreased significantly due to the larger mass flow rate in Path *** addition,the effect of the working fluid inventory on the cooling down time was generally small in the range from 2.99 MPa to 3.80 ***,with 2.80 MPa working fluid inventory,it required much longer cooling down time,which was because of the lack of liquid in the CLHP with low working fluid ***,the influence of gravity on the temperature variation of the components during the experiments was *** work is beneficial for better understanding of the cooling down process and optimizing of CLHPs.

关键词： cryogenic loop heat pipe secondary loop cooling down heat transfer

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