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本文借助有限差分法对新型分离结晶法生长CdZnTe晶体过程中熔体内部的热毛细对流进行了三维数值模拟,获得了Marangoni数、高径比及狭缝宽度等无因次参数对流动的影响。结果表明;当Marangoni数较小时,流动为稳态流动,传热以导热为主,当Marangoni数超过一定数值后,流动发展为非稳态热毛细对流,对流的影响加大,中心竖直截面上的等温线变形加剧;随着高径比的增大,下自由表面处的流胞流动强度增强;随着狭缝宽度的增大,上下自由表面处的温度梯度和速度都有所减小。
In this paper, the thermo-capillary convection of the melt in the process of growing a CdZnTe crystal by the new separation crystallization method was simulated by finite difference method, and the influence of dimensionless parameters such as Marangoni number, height-diameter ratio and slit width on the flow was obtained. The results show that when the Marangoni number is small, the flow is steady flow and the heat transfer is dominated by heat conduction. When the Marangoni number exceeds a certain value, the flow develops into unsteady hot capillary convection and the convection is more affected. The central vertical section As the aspect ratio increases, the flux density increases at the lower free surface. As the width of the slit increases, the temperature gradient and the velocity at the upper and lower free surfaces decrease .