Abstract
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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