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为掌握地面条件下分离结晶过程中熔体内部的流动规律,采用有限差分法对分离结晶生长CdZnTe晶体熔体内热毛细-浮力对流作了三维数值模拟,在计算过程中熔体无量纲高度H取1,无量纲气缝宽度B分别取0.100,0.075,0.050和0.025.结果表明:当Marangoni数较小时,熔体流动呈较弱的稳态流动;随着Marangoni数增加,熔体内部流动逐渐增强,温度梯度逐渐加大;当Marangoni数超过临界值,流动转变成非稳态流动,熔体内部流场和温度场出现振荡;随着气缝宽度减小临界Marangoni数增大.
In order to understand the internal flow of melt in the process of separation and crystallization under the ground conditions, the finite difference method was used to simulate the thermocapillary-buoyancy convection in the crystal growth of CdZnTe crystal. The dimensionless height H of the melt 1, the dimensionless air gap B is 0.100, 0.075, 0.050 and 0.025, respectively. The results show that when the Marangoni number is small, the melt flow has a weak steady-state flow; as the Marangoni number increases, the internal melt flow gradually increases , The temperature gradient gradually increases. When the Marangoni number exceeds the critical value, the flow transforms into unsteady flow, and the flow field and the temperature field in the melt oscillate. As the width of the air gap decreases, the critical Marangoni number increases.