Evaporative heat transfer model of a loop heat pipe with bidisperse wick structure
Resource
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 54(21-22), 4621-4629
Journal
International Journal of Heat and Mass Transfer
Pages
4621-4629
Date Issued
2011
Date
2011
Author(s)
Lin, Fang-Chou
Liu, Bing-Han
Huang, Chi-Ting
Chen, Yau-Ming
Abstract
A mathematical model of evaporative heat transfer in a loop heat pipe was developed and compared with experiments. The steady-state thermal performance was predicted for different sintered nickel wicks, including monoporous and bidisperse structures. The effect of wick pore size distribution on heat transfer was taken into consideration. The wick in the evaporator was assumed to possess three regions during vaporization from an applied heat load: a vapor blanket, a two-phase region, and a saturated liquid region. The evaporator wall temperature and the total thermal resistance at different heat loads were predicted using ammonia as the working fluid. The predictions showed distinct heat transfer characteristics and higher performance for the bidisperse wick in contrast with monoporous wick. A bidisperse wick was able to decrease the thickness of the vapor blanket region, which presents a thermal resistance and causes lower heat transfer capacity of the evaporator. Additionally, a validation test presented good agreement with the experiments. © 2011 Elsevier Ltd. All rights reserved.
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journal article
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