回路型脉动热管的运行与传热

为深入了解脉动热管的运行和传热的机理与规律，研究了铜—水回路型脉动热管(Looped PHP)在空气冷却条件下，充液率、管径、加热段冷却段长度比等因素对传热性能的影响。结果发现，充液率在35%附近时传热功率达到最大值；相同的对流换热条件下，小管径热管的热阻更小，运行和传热性能更好；脉动热管本身的热阻与外部换热条件有很大的相关性。另外，通过分析脉动热管壁面温度波动的特征，揭示了波动的成因及其所反映的内部流动和传热状况。

Running and Heat Transfer of Looped Pulsating Heat Pipe

In order to understand the mechanism and characteristics of the running and heat transfer of pulsating heat pipe, this paper studied the influence of the filling rate, inner diameter and length ratio of heating section to cooling section on the heat transfer performance of copper-water Looped PHP under air cooling condition. It was found that the heat transfer rate reaches peak value at the filling rate of 35%. The heat resistance of PHP is strongly relevant to heat exchange condition. In the same environment, PHP of smaller diameter has better heat transfer performance. Besides, on the basis of analyzing the characters of the temperature fluctuation on walls of PHP, this paper also discussed the cause of this temperature fluctuation and the inside running and heat transfer status it reflected. The results and conclusions are beneficial to understanding of the mechanism of heat transfer and searching for PHP of better performance.