乙醇-水双工质脉动热管传热性能实验研究

Experimental Study on the Thermal Performance of Ethanolwater Double-medium Pulsating Heat Pipe

通过对乙醇-水双工质脉动热管在风冷条件下进行的实验研究,探讨了加热功率、体积配比和充液率对热管振荡和传热性能的影响。结果显示,在实验条件下,功率小于100 W时,充液率、体积配比和加热功率对热管传热性能的影响较明显;中高功率时热管稳定性与热管中液态水体积份额有关,且随水份额增大热阻降低。而水份额低于21%时,热管稳定性较差,且水的份额越小,不稳定出现时的功率越低。50%~70%充液率热管的传热性能要优于30%充液率的热管,体积配比相当的热管振荡特性和传热性能相对较差。

Through experimental study ofpulsating heat pipe with ethanol-water double working medium in air-cooled mode,the effects of heating power,volume ratio,and filling ratio on heat pipe oscillation and heat transfer performance have been discussed.Under the experimental conditions,results show that with power less than 100 W,filling ratio,volume ratio,and heating power have relatively apparent effects on heat transfer performance of heat pipe,while under medium or high power,the stability of such heat pipe is related to volumetric quota of liquid water.The thermal resistance decreases with the increase of water quota.When water quota is below 21%,heat pipe has relatively poor stability and its power upon occurrence of instability decreases with the decrease of water quota.The thermal performance of heat pipe with 50% ~ 70% filling ratio is better than the one with 30% filling ratio,while the heat pipe of equal volume ratio demonstrates the worse oscillating characteristics and heat transfer performance.