Effects of geometrical parameters on the boiling limit of bi-porous wicks

Title
Effects of geometrical parameters on the boiling limit of bi-porous wicks
Author(s)
변찬김성진[김성진]
Keywords
BIPOROUS WICKS; HEAT-PIPE; MEDIA; FLOW
Issue Date
201212
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.55, no.25-26, pp.7884 - 7891
Abstract
In this paper, the boiling limit of bi-porous sintered metal wicks is considered. The effects of the particle size (45 <= d <= 200 mu m) and the cluster size (250 <= D <= 675 mu m) on the boiling limit are investigated experimentally and analytically. In order to gain understanding of the boiling phenomena in bi-porous wicks, the bubble movements in the bi-porous wicks are visualized using glass particle wicks and a high speed camera. Based on the visualization results, an analytic model for predicting the boiling limit of the bi-porous wicks is developed. The model predicts the experimental data well within the error of 11%, and indicates that the permeabilities of liquid and vapor are key parameters for determining the boiling limits of wicks. The bi-porous wicks have higher boiling limits than the mono-porous wicks by up to 67%, since they have much higher liquid/vapor permeabilities, by having separate flow paths for each phase. From the model, an optimal configuration of bi-porous wick is found to be 4 < D/d < 6. (C) 2012 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/26705http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.08.016
ISSN
0017-9310
Appears in Collections:
공과대학 > 기계공학부 > Articles
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