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Heat Transfer Research
Facteur d'impact: 1.199 Facteur d'impact sur 5 ans: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012005965
pages 43-57

STUDY OF THE EFFECTS OF LIQUID FRACTION AND VAPOR VOLUME ON THE FLUCTUATING TEMPERATURE IN AN OSCILLATING HEAT PIPE USING NEUTRON IMAGING

I. Yoon
Center of Thermal Management, Mechanical and Aerospace Engineering, University of Missouri, E2412 Lafferre Hall, Columbia, MO 65211, USA
Hongbin Ma
Marine Engineering College, Dalian Maritime University, Dalian, Liaoning 116026 China; Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri, 65211, USA
R. A. Winholtz
Department of Mechanical and Aerospace Engineering, University of Missouri; Columbia, Columbia, MO 65201

RÉSUMÉ

This paper presents an experimental study of the correlation between liquid motion and temperature change in an oscillating heat pipe (OHP). The images of the liquid motion were made using the neutron imaging technique. An algorithm to calculate the vapor and liquid fractions at each position of the OHP from the images has been developed. By comparing the average liquid fractions and the temperature data in the evaporator, it is shown that a quick liquid motion is synchronized with a quick temperature change. By comparing the distance from the two-phase interface to the edge of the evaporator with the vapor portion length and temperature, this study concludes that the vapor volume changes are directly related to those of temperature. A decrease in the temperature was observed before it increased due to the liquid motion. This temperature drop could also be due to thin film evaporation.


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