充液量对回路热管性能的影响

实验研究了以Cu粉烧结块为吸液芯、Al制太阳花散热器为冷凝器的回路热管(LHP)在不同充液率条件下充入工质为无水乙醇后的启动、温度波动以及热阻等传热性能。Cu粉烧结块吸液芯相对丝网吸收层可以产生更大的毛细力,Al制太阳花散热器可以使整个LHP更轻便,利于不同安装场合的应用。研究结果表明:1)LHP的启动受热负荷大小和充液率共同作用;2)温度波动随功率的增加而变得平缓,而随着充液率的增加,温度波动频率却有所上升;3)充液率影响LHP的热阻变化,最佳充液率为60%。

The influence of filling ratio on the performance of loop heat pipe

Loop heat pipe (LHP) is an efficient heat transfer devic e for electronics cooling.In order to improve the heat transfer performance of loop heat pipe,the effect of ethanol o n the transfer performance (such as start-up,temperature oscillation and the thermal resistance) of a loop heat pi pe is investigated experimentally. The loop heat pipe with sinter wick and the condenser is an aluminum sun-flower heat sink.The sinter wick provides larger capillary force to get liquid flow back.The aluminum sun-flower hea t sink can make the whole loop heat pipe system more portable,which is better for the loop heat pipe heat sink with different installation conditions. The experimental results show that the start-up characteristic is related to the input heat and the filling ratio, when the input heat increases or the filling ratio is proper,the loop heat pip e could startup successfully;the temperature oscillation is gentle with the input heat increases,but the freque ncy increases with the filling rate increases;there is an optimum filling ratio (60%) at the same input heat w ith the lowest thermal resistance. These results are expected to provide a theoretical reference when loop h eat pipe is applied to electronics for effective heat dissipation.