中文摘要：

本文通过实验研究了工质类型和工质充液率对竖直式脉动热管换热特性的影响。采用了去离子水、甲醇和乙醇三种液体作为工质,加热功率为5~80 W。结果表明,脉动热管的换热特性与工质充液率密切相关。当去离子水充液率为50%时,脉动热管内能够形成稳定的气柱和液塞流动,具有最佳的换热表现,获得的最低热阻为80 W加热功率下的0.47K/W。在较小的加热功率下,乙醇和去离子水具有比甲醇更小的热阻,随加热功率增加,采用甲醇时加热段温度上升波动剧烈,而采用去离子水和乙醇时温度上升平缓,具有更好换热效果。甲醇和乙醇做工质时获得的最小热阻分别为80 W加热功率下的0.56 K/W和0.48 K/W。

英文摘要：

An experimental investigation was conducted to study the thermal performance of pulsating heat pipe（PHP） with different working fluids.Deionized water,methanol and ethanol were used in this studied at varying thermal loads ranging from 5 W to 80 W.Experimental results showed that the heat transfer capability of the tested PHP was highly dependent on the filling ratios of the working fluids.At a 50%filling ratio,a stable gas-liquid slug flow can be generated and the PHP had the best performance：a minimum thermal resistance of 0.47 K/W at 80 W thermal load was obtained.At low thermal loads,the PHP with ethanol and deionized water had lower thermal resistance than with methanol.With the increase of thermal load,strong fluctuations of temperature increase at the heating section appeared when using methanol as working fluid,while the temperature was increased gently with a better heat transfer performance when using deionized water or ethanol.The obtained minimum thermal resistances for the cases using methanol and ethanol were 0.56 K/W and 0.48 K/W,respectively,at 80 W thermal load.