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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℃。
In order to meet the requirement of electronic equipment working at lower temperature, heat transfer experiment of plate-type pulsating heat pipe with low boiling point such as R141b and R600a and channel side length of 1 mm is carried out. The results show that under different heating power, the pulsating heat pipe with low boiling point has shorter start-up time, lower start-up temperature, smaller temperature difference between hot and cold ends, lower hot end temperature and lower thermal resistance under different heating powers. Low boiling point working fluid can greatly improve the heat transfer performance of micro-channel pulsating heat pipe. When R600a is working fluid, the starting time of pulsating heat pipe is only 12 seconds. In normal operation, R141b is the minimum temperature difference between cold and hot end of pulsating heat pipe 0.8 ℃ .