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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018017363
pages 1171-1183

NUMERICAL INVESTIGATION OF THERMAL PERFORMANCE OF A CRYOGENIC OSCILLATING HEAT PIPE

Qing Liang
Institute of Electrical Engineering, Chinese Academy of Sciences, Beij ing 100190, China; School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China; University of Chinese Academy of Sciences, Beij ing 100049, China
Yi Li
Institute of Electrical Engineering, Chinese Academy of Sciences, Beij ing 100190, China
Qiuliang Wang
Institute of Electrical Engineering, Chinese Academy of Sciences, Beij ing 100190, China; University of Chinese Academy of Sciences, Beij ing 100049, China

ABSTRAKT

The oscillating heat pipe (OHP) with simple structure and high heat transfer effi ciency has been proposed recently for cryogenic use. In this paper, a model of fluid flow and heat transfer on multiple liquid slugs and vapor plugs in an OHP has been developed. The cryogenic OHP with working fluid of nitrogen is studied using the model. Oscillatory flow and circulatory flow are observed. The mass flow rate of liquid slugs and the mean wall temperature of the evaporator section are calculated. Furthermore, the effective thermal conductivity of the cryogenic OHP is determined, which shows much higher thermal performance than that of high purity metal. The effects of the heat input and the filling ratio on the effective thermal conductivity are discussed. Finally, the calculated effective thermal conductivity is compared with experimental results, and it is seen that this model correctly predicts the thermal performance of a cryogenic OHP in the case of a medium and low heat input.


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