轴向磁场下分离结晶熔体内热毛细对流的数值模拟

Numerical simulation of thermocapillary convection in detached solidification under axial magnetic field

为研究轴向磁场对分离结晶Bridgman法生长CdZnTe晶体熔体热毛细对流的影响,采用有限差分法进行了三维数值模拟。结果表明轴向磁场能有效抑制熔体内的热毛细对流;轴向磁场对熔体内部温度分布也有较大的影响,能使等温线分布变得平缓;当磁场强度不变时,随着狭缝宽度的增大熔体内部的流动减弱。

In order to understand the effect of axial magnetic field on thermocapillary convection in detached solidification,a series of 3-D numerical simulations of thermocapillary convection of CdZnTe melt were conducted by using the finite-difference method.The results indicate that the approach of using axial magnetic field is an effective way to suppress the thermocapillary convection.At the same time,smooth isotherms and small temperature gradients are observed by using the axial magnetic field.Besides,when the magnetic field intensity is kept unchanged,the thermocapillary convection gets weaken with the increase of the gas gap.