新型液线毛细芯环路热管启动及传热性能

Start-up and Heat Transfer Performance of a Novel Loop Heat Pipe with Liquid Line Wick

为了解决传统环路热管(loop heat pipe,LHP)低负荷下启动难,运行不稳定的问题,设计了一种无储液室,且带有液线毛细芯的新型环路热管,对比分析了其与传统结构环路热管的启动及传热性能,还测试分析了该新型环路热管在变工况和重力辅助条件下的运行性能。结果表明:环境温度25℃,热沉温度20℃时,新型液线毛细芯环路热管可以在10~130 W成功启动,运行温度最高为91.3℃,热阻0.33 K/W,有良好的变工况及重力辅助运行性能。与传统环路热管相比,新型液线毛细芯环路热管在低负荷启动时热阻较小且有效消除了温度振荡现象,高负荷启动时热阻较大但启动时间大幅减少。

In order to solve the problems of difficult start-up and unstable operation of the traditional loop heat pipe(LHP)at low load,a novel LHP with liquid line wick and without compensation chamber was designed and fabricated,and its start-up and heat transfer performance were compared with a traditional LHP.In addition,the operation performance of the novel LHP under variable conditions and gravity assisted conditions were tested and analyzed.The results show that when the ambient temperature is 25℃and the heat sink temperature is 20℃,the novel LHP can start up smoothly at heat loads of 10~130 W,with the maximum operating temperature of 91.3℃and the thermal resistance of 0.33 K/W.Comparing to the tested traditional LHP,the thermal resistance of the novel LHP is smaller and the temperature oscillation phenomenon is effectively eliminated when starting at low heat loads.However,the thermal resistance of the novel LHP is higher at high heat loads,but the start-up time is greatly reduced.