Manufacturing and Performance Test Of The Loop heat Pipe With Bidisperse Wick Structures
Date Issued
2005
Date
2005
Author(s)
Chen, Po-Lun
DOI
zh-TW
Abstract
In this paper, bidisperse wick structures were manufactured for enhancing the heat transfer capabilities of the loop heat pipe. Use two particle sizes of the same material to manufacture two types of the bidisperse wick structures, called “the two layers” and “the powders mixed” for increasing more effective vapor region to promote the performance of the loop heat pipe. In the meanwhile, the monodisperse wick structure is manufactured for a contrast. Both of the monodisperse and the bidisperse wick structures were then installed into the loop heat pipe, then the heat transfer performance of the loop heat pipe system was tested.
Find the relationship among the different particle sizes with the temperature of the forming wick structures by many times of sintering experiment. Based on the relationship, acquire a proposal of manufacturing bidisperse wick structures successfully. In the wick structure’s parameters, the permeability of “the powders mixed” is enhancing 30% by the monodisperse wick structure when the ratio of the two types of the powders is 1：1 , meanwhile, the porosity of the bidisperse wick structure is close to the one of the monodisperse wick structure.
Summing up the tested results of the loop heat pipe with the bidisperse and with the monodisperse wick structures, the two types of the bidisperse wick structures have a shorter time of reaching steady state than the time of the monodisperse structure. Indicating the bidisperse structures improves the vapor and liquid distribution in the porous media when vaporization phenomena occur in it. Series of testing results showed that the maximum heat transport capacity of the loop heat pipe with monodisperse structure was up to 200-Watts and the thermal resistance was 0.26℃/W , meanwhile , the one with bidisperse structure of “the powders mixed” by the ratio is 1：1 was up to 300-Watts and the thermal resistance was 0.17℃/W at 80℃ allowable temperature.On the preliminary measuring, the loop heat pipe with bidisperse wick structures is referred to have high potential for the application.
Subjects
雙孔徑毛細結構
迴路式熱管
燒結
the bidisperse wick structures
loop heat pipe
sintering
Type
thesis
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