Operational characteristics of flat type loop heat pipe with biporous wick
Operational characteristics of flat type loop heat pipe with biporous wick
复制标题
双孔芯平板式环路热管的工作特性
DOI：
10.1016/j.ijthermalsci.2012.02.027
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发表时间：
2012-08-01
影响因子：
4.5
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Liu, ZhiChun;Li, Huan;Liu, Wei
环状热管是一种利用工质蒸发和冷凝来传递热量的两相换热装置。本文对一种新型平板式液压机进行了实验研究，采用双孔介质和不锈钢网分别作为一次液芯和二次液芯，这种创新的结构可以支撑一次液芯并辅助其泵送工作液。该回路由铜制成，以烧结镍粉为主要芯材，以甲醇为工质。为了验证环路的可靠性和性能，进行了启动试验和性能试验。试验结果表明，在水平位置，循环启动时的热负荷范围为20~160W(热流密度为16.8W/cm(2))，蒸发器壁温低于85℃。在30~80W的热负荷范围内，环路内出现温度振荡，但这种振荡对环路性能的影响不大。在随机加载测试中，该回路可以承受高达100W的负载跳跃，而不会出现操作故障。LHP的热阻在0.46℃/W到2.28℃/W之间。Crown版权所有(C)2012由Elsevier Masson SAS出版。版权所有。
Loop heat pipes (LHPs) are two-phase heat transfer devices that utilize the evaporation and condensation of working liquid to transfer heat. In present paper, experimental researches are conducted for a new type of flat type LHP, in which biporous porous media and stainless steel mesh are adopted as primary wick and secondary wick respectively, and this innovative structure can support the primary wick and assist it pumping working liquid. The loop is made of copper with sintered nickel powder as primary wick and methanol as the working fluid. Both start-up test and performance test are conducted to validate the reliability and performance of the loop. From the test results, it is found that, in the horizontal position, the loop is able to start-up with a heat load rang between 20 W and 160 W(heat flux of 16.8 W/cm(2)) with evaporator wall temperature below 85 degrees C. At heat load between 30 W and 80 W, temperature oscillations are observed throughout the loop, however, the effect of this oscillation on the performance of the loop is not significant. During a random loading test, the loop can stand a load jump as high as 100W without an operation failure. The thermal resistance of the LHP lies between 0.46 degrees C/W to 2.28 degrees C/W. Crown Copyright (C) 2012 Published by Elsevier Masson SAS. All rights reserved.