不同加热功率下充液率对无芯环路热管性能的影响

The influence of filling ratio on the performance of wickless loop heat pipe under different heating powers

设计了以铝为管材、丙酮为传热工质的无芯环路热管。其蒸发段采用加热带加热,冷凝段用风冷降温。热管依靠蒸发压头使工质循环,并依靠重力作用,使冷凝液回流到蒸发段。搭建试验台并研究了不同加热功率下充液率对无芯环路热管的传热温差、传热量、热效率、热阻和当量导热系数的影响。结果表明:加热功率为150.00 W、充液率为30%时,无芯环路热管的均温性最好;传热温差和热阻均最小,分别为6.75℃、0.045 K/W。传热量132.00 W、热效率0.88、当量导热系数168125 W/(m·K),均达到最大值。所以,该无芯环路热管在本实验研究范围内的最佳工作条件为加热功率150.00 W、充液率30%。

A wickless loop heat pipe(WLHP)is designed using aluminum as tube material and acetone as heat transfer working fluid.The evaporation section is heated by a heating belt,and the cooling section is cooled by air.The heat pipe utilizes the evaporation pressure to recycle the working fluid,and the condensate is recirculated to the evaporation section by gravity.The test bench was built to investigate the effects of filling ratio on the heat transfer temperature difference,heat transfer capacity,thermal efficiency,thermal resistance,and equivalent thermal conductivity under different heating powers.The results show that as the heating power is 150 W and the filling ratio is 30%,the WLHP has the best temperature uniformity,and the smallest heat transfer temperature difference and thermal resistance,which are 6.75℃and 0.045 K/W,respectively.The heat transfer capacity,thermal efficiency,and theequivalent thermal conductivity are 132 W,0.88,and 168125 W/(m·K),respectively,which reach their maximum values.Therefore,the best working condition of the WLHP in the experimental research range is the heating power of 150 W with the filling rate of 30%.