中文摘要：

本文对取热器与冷凝器分离的被动式相变冷却系统的热阻及响应时间进行了研究。热阻与响应时间分别是冷却系统在稳态及非稳态条件下的表征参数。通过建立热输运管路内的换热模型，着重分析了管径、管长、倾斜角度对这两个参数的影响。实验研究表明：整个冷却系统在负荷突然增加时，响应特性良好；管径与管长的减小、倾斜角的降低均有利于热阻的减小，而且热阻随着负荷的增加而减小；热阻较小时，热输运管内冷凝换热较弱，管路沿程温度场的均匀性较好，相应的响应时间较短。

英文摘要：

An experimental study of thermal resistance and response time of a separate-type passive phase change cooling system was conducted in this paper. Thermal resistance and response time of the cooling system were the characteristics of steady and transient states, respectively. Based on the established heat transfer model in the heat transport pipeline, the study focused primarily on the effects of inner diameter, tube length, and inclination angle on these two parameters. Experimental study showed that the cooling system had a good performance when the supplied heat loads increased suddenly. Thermal resistance decreased with decreasing inner diameter, tube length and inclination angle, while decreasing as the heat loads increased. When the thermM resistance became lower, it was indicated that the heat transfer during in-tube condensation in the heat transport pipeline was low and the temperature field along the pipeline was uniform, thereby the corresponding response time was shorter.