针对电子设备需要在较低的温度下工作的要求,本文对采用R141b与R600a等低沸点工质,槽道边长为1 mm的板式脉动热管进行传热实验研究.结果表明,对比丙酮工质脉动热管,在不同加热功率下,低沸点工质脉动热管启动时间短,启动温度低,正常运行时冷热端温差小,热端温度低,热阻小.低沸点工质能大幅提高微通道脉动热管传热性能,R600a为工质时,脉动热管启动时间最短仅需要12 s,正常运行时,R141b为工质脉动热管冷热端温度差最小为0.8℃.
To meet the need of electronic equipment work at lower temperature,experiment study on PHP charged with R141b and R600a.Experimental results indicate that low-boiling point fluid pulsating heat pipes start up more quickly and start-up temperature is lower compared with acetone at different heat power.During operation low-boiling pulsating heat pipe has smaller temperature difference、lower heating-surface temperature and smaller thermal resistance.Low-boiling point fluid improve PHP heat transfer performance,with R600a as working fluid,the shortest start-up time is 12 s,during operation,the smallest temperature difference is 0.8℃ with R141b as working fluid.
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