Abstract: The temperature field and the velocity field of the water heat pipe are numerically simulated in order to analyze the temperature uniformity in the thermometer well. The mathematical models of three coupled heat transfer areas, which include the pipe wall, the wick, the liquid water in the cavity and the vapor, are established. By using VOF model, the heat and mass transfer process of fluid flow and heat transfer in the water heat pipe were simulated to obtain the temperature distribution and velocity distribution under steady state. The effects of the heating temperature, the length of the heating section, and the filling volume on the temperature field in the water heat pipe are analyzed. Moreover, the comparison result indicates that there is a good agreement between the numerical simulation results and the experimental results. The results of this paper can provide theoretical basis and guidance for water heat pipe design, operation and improvement.

Key words: water heat pipe, VOF model, temperature distribution, numerical simulation

摘要： 为了研究水热管内腔里的温度均匀性，进行了水热管内腔的温度场和速度场的数值模拟。建立了包括管壁、吸液芯及内腔里的液体水和水蒸气3个耦合传热区域的水热管数理模型，采用VOF模型对水热管内部的流动与传热传质过程进行了数值模拟分析，得到了水热管稳定运行时的温度场和速度场分布，并探讨了加热温度、加热段长度和充液量等参数对热管内腔温度场分布的影响规律，计算结果与实验结果的对比结果表明两者能够较好吻合。本文研究结果可为水热管的设计、运行和改进提供理论依据和参考。

关键词: 水热管, VOF模型, 温度分布, 数值模拟