【摘要】 选取甲醇-丙酮混合物为工质,对小充液率(20%)、大充液率(60%)和不同混合体积比条件下脉动热管的温度振荡和传热特性进行了实验研究。由结果可知:在启动阶段,甲醇-丙酮体积比越小,启动时间越短;与大充液率相比,小充液率的启动时间短,且温度振幅较大。在稳定运行阶段,小充液率的热阻随着加热功率增大先减小然后略有增大,存在最小热阻,且随着体积比的减小,最小热阻对应的加热功率也减小;大充液率下的热阻随加热功率增大单调减小,最后逐渐趋于平缓,并且不同体积比热阻间的差值逐渐减小。更多还原

【Abstract】 The methanol and acetone are mixed as working mediums to study the heat transfer characteristic and temperature oscillation of pulsating heat pipe with small filing ratio( 20%) and large filling ratio( 60%) through different situations including various volume ratio. The results show that the mixing working medium with smaller mixing volume ratio has shorter start time in the startup stage. Compared with the large filling ratio,the small filling ratio has shorter start time and larger temperature amplitude. In the steady operation stage,the thermal resistances of the mixed working medium with small filling ratio,first decrease to a minimum and then increase slightly as the heating power increases. As the volume ratio decreases,the heating power corresponding to the minimum thermal resistance reduces. With the large filling ratio, the thermal resistances of the working mediums decrease monotonously and get close to each other as the heating power increases.更多还原