勾形磁场作用下分离结晶中熔体热毛细对流的数值模拟

摘要

为了更好地了解勾形磁场对分离结晶法制备 CdZnTe 晶体过程中熔体热毛细对流的影响,采用有限差分法对熔体内的热量和动量传递进行数值模拟.假定熔体为不可压缩牛顿流体,熔体的高径比为1,狭缝自由表面无因次宽度为0．1,研究了不同 Ma 数下,Ha 数分别为0、45、90、135时的 CdZnTe 晶体生长过程.结果表明,勾形磁场能够有效地抑制熔体内部的对流,并且随着磁场强度的增加,抑制作用增强,熔体内部流动减弱.%A numerical study about heat and momentum transfers in the melt was proformed to clarify the effect of cusp magnetic field on the melt thermocapillary convection in detached solidification by the method of the fi-nite-difference method.During the calculation the melt was considered to be an incompressible Newtonian fluid, the ratio of height and radius and the width of gap were 1 and 0.1,respectively.The process of crystal growth was simulated for Ha = 0,45,90 and 135 under different Ma numbers.The results indicated that the cusp magnetic field can effectively suppress the flow in the melt,and the inhibition effect was enhanced with the in-crease of magnetic field strength.