微尺度型腔内液态金属流动规律模拟研究

修正了传统的Navier-Stoke方程，并利用修正后的方程与Fluent软件对微尺度型腔内Zn-Al合金微流动规律进行了数值模拟.模拟结果表明：液态金属在微尺度管道内的流动规律在管径为0.5mm时出现临界状态，管径越细，速度附面层相对厚度就越大.同时,微管流动存在着宏观流动中没有的“凸进效应”，且随着入口压力增大，流动前沿自由液面的凸进效应减弱.在流动前沿区域和上游区域之间出现负压力梯度区，且管径越细越明显.关键词：微管道微流动Zn-Al合金

Simulation research on the law of flow of liquid metal in micro-channels

We modified the traditional Navier-Stokes equation, and used the Fluent software to simulate the microscopic law of flow of Zn-Al alloy melt in the micro-channel. The simulation results show that when the diameter of the channel is 0.5mm， the liquid metal in the micro-channel is in a critical state. Relative thickness of boundary-velocity layer increases with the decrease of diameter of the channel, and micro-channel flow shows obvious convex-front effect, which has not been observed in the macroflow. The convex-front effect weakens when the inlet pressure increases. Between the flow front and upstream region, there exist negative pressure gradient zones, which become more outstanding in finer channels.