Capillary performance of bi-porous sintered metal wicks

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The capillary performance (K/R-eff) of the wick is a key design parameter for the thermal performance of heat pipes. In this study, the capillary performance of a bi-porous wick is investigated experimentally and analytically. The effects of particle size (40 <= d <= 600 mu m) and cluster size (250 <= D <= 1440 mu m) on the capillary performance are investigated. The capillary flows in the wicks are visualized using sintered glass powder wicks and a high speed camera. From the experiments, it is shown that the capillary performances of bi-porous wicks are significantly higher than those of mono-porous wicks. The capillary performance of 125/675 mu m bi-porous wick is 11 times larger than that of a 125 mu m mono-porous wick. In the bi-porous wick, three distinct capillary flow regimes are observed, depending on the ratio between particle and cluster sizes (d/D). A semi-analytic model for predicting the capillary performance of bi-porous wicks is developed for each regime. The model prediction shows excellent agreement with experimental results and indicates that the cluster size should be 4-6 times larger than the particle size for an optimal capillary performance. The effect of the contact angle on the capillary performance of bi-porous wicks is shown to be negligible. (C) 2012 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-07
Language
English
Article Type
Article
Keywords

BIPOROUS WICKS; HEAT PIPES; PERMEABILITY; EVAPORATION; FLOW

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.55, no.15-16, pp.4096 - 4103

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2012.03.051
URI
http://hdl.handle.net/10203/102798
Appears in Collection
ME-Journal Papers(저널논문)
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