Abstract: The working principle and properties characterization of two closed thermosyphon were introduced in this paper. The research on the closed thermosyphon heat transfer enhancement was summarized from aspects of inherent parameters and operating conditions. The main mechanism of influence on performance of the closed thermosyphon by changing parameters was introduced,such as type of working fluid,filling ratio,structural parameters,surface treatment, heating power, operating temperature, inclination angle and,cooling medium flow rate. Research status and influence of variation of the above factors on heat transfer performance of closed thermosyphon were summarized. Shortcomings and limitations of the present study on heat transfer enhancement of closed thermosyphon were also pointed out. Suggestions were put forward for further researches,for example,the synergy between various factors should be determined,influence of other factors should be eliminated,scope of variables should be expanded in researches. In addition,it was suggested that study on enhancement of heat transfer in closed thermosyphon and strengthening mechanism of heat transfer and mass transfer in the closed space,such as boiling and condensation,should be combined. Heat and mass transfer theory and calculation formula should be improved.

Key words: closed thermosyphon, heat transfer enhancement, properties characterization, inherent parameters, operating conditions

摘要： 介绍了闭式热虹吸管的工作原理和性能表征方式，从固有参数和操作条件两个方面对闭式热虹吸管强化传热研究进行了综述，阐述通过改变工质种类、充液率、结构参数、表面处理、加热功率、运行温度、倾角和冷却介质流量等因素对闭式热虹吸管性能影响的主要机理。归纳总结了上述因素对闭式热虹吸管传热性能影响的研究现状和变化规律，并指出目前闭式热虹吸管强化传热研究中的不足和局限性。建议研究中应确定各性能影响因素之间的协同关系，消除其他因素的影响，扩大所研究变量变化范围。此外建议将闭式热虹吸管强化传热研究与封闭空间内沸腾和冷凝等传热传质过程强化机理研究相结合，完善传热传质理论及计算公式。

关键词: 闭式热虹吸管, 强化传热, 性能表征, 固有参数, 操作条件