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采用有限容积法和焓-多孔介质模型数值模拟了组合式吸液芯内金属钠熔化的固-液相变过程.由于液态金属钠和组合式吸液芯的导热系数在同一数量级,因而采用单温度模型,模拟过程中考虑了非达西效应影响和液态金属钠的自然对流现象.研究结果发现,组合式吸液芯中金属纤维毡厚度越小,金属钠受热熔化的速度越快,且熔化后的液态钠流速达到最大值所用的时间越短,进而可以缩短热管启动时间;组合式吸液芯中金属纤维毡厚度越大,竖直加热壁面的温度分布越均匀、壁面温差越小,进而减少了加热壁面产生过热点的可能.
The finite volume method and the enthalpy-porous media model were used to simulate the solid-liquid phase transition of the sodium metal fusion in the wick.As the liquid metal sodium and the combined wick have the same thermal conductivity, Temperature model, the non-Darcy effect and the natural convection of liquid metal sodium were taken into account in the simulation.The results showed that the smaller the thickness of the metal fiber felt in the wick, the faster the metal sodium heated and melted and melted The shorter the time it takes for the flow rate of liquid sodium to reach the maximum value, which in turn can shorten the start-up time of the heat pipe. The greater the thickness of the metal fiber felt in the combination wick, the more uniform the temperature distribution of the vertical heating wall and the smaller the temperature difference of the wall, Reduce the heating wall may produce hot spots.