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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v14.i2.70
pages 175-187

Study on Miniature Oscillating Heat Pipes

Shigefumi Nishio
Key Laboratory of Enhanced Heat Transfe and Energy Conservation, Ministry of Education, School of Chemical and Energy Engineering, South China University of Technology, China; and Institute of Industrial Science and Technology, University of Tokyo, Japan
Shuangfeng Wang
Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, PR China

SINOPSIS

Heat transport rates of miniature heat pipes with inner diameter of 1.5 mm, 1.2 mm, and 0.9 mm were investigated by using R141b, ethanol and water as working fluids. The effects of the inner diameter, liquid volume faction, and material properties of the working fluids are examined. It is shown that the smaller the inner diameter, the higher the thermal transport density. For removing high heat flux, the water is the most promising working fluid as it has the largest critical heat transfer rate and the widest operating range among the three kinds of working fluids. A one-dimensional numerical simulation is carried out to describe the heat transport characteristics and the two-phase flow behavior in the closed-loop oscillating heat pipes. The numerical prediction agrees with the experimental results fairly well, when the input heat through is not very high and the flow pattern is slug flow.