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采用有限差分法对CdZnTe分离结晶过程中熔体内热毛细对流作了三维数值模拟,讨论了浮力和轴向磁场对熔体热毛细对流的影响规律。结果表明:熔体内热毛细对流以上下两个流动方向相反的流胞存在,并随着Marangoni数(Ma)的加大,流动增强;在Ma数较小时,浮力加强熔体内热毛细对流,而当Ma数较大时,浮力却抑制熔体内热毛细对流;轴向磁场能很好的抑制熔体热毛细对流,并随着Hartmann数(Ha)的增大,抑制作用加强。
The finite difference method was used to simulate the three-dimensional numerical simulation of hot capillary convection in the melt during the separation and crystallization of CdZnTe. The influence of buoyancy and axial magnetic field on the thermal capillary convection was discussed. The results show that the flow of hot capillary convection in the melt flows in the opposite direction, and the flow increases with increasing of the Marangoni number (Ma). When the Ma number is small, the buoyancy strengthens the thermal capillary convection in the melt. When the Ma number is large, the buoyancy suppresses the thermal capillary convection in the melt. The axial magnetic field can effectively suppress the convection of the melt capillary and enhance the inhibition with the increase of the Hartmann number (Ha).