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将加扩展项的轴对称双倒易边界元方法拓展应用于数值模拟垂直Bridgman法生长HgCdTe及CdZnTe晶体过程中非等温相变传热传质问题,印证了轴向溶质浓度的分区分布并且研究了拉晶速度对分区的影响,同时分析了晶体生长过程中产生的一维瞬态非等温相变现象,获得了由初始过渡区经稳定生长区,最后到末端过渡区全过程的非等温相变数值结果.进一步,通过数值模拟捕获了拉晶速度为零时,稳态情况下的二维轴对称相变界面位置和形状,并得到了熔体和晶体温度场,最后着重研究了瞬态拉晶过程中的二维轴对称非等温相变现象,比较了其与等温相变的差异,并揭示了不同拉晶速度对非等温相变现象的影响.
The axisymmetric double reciprocal boundary element method with extended term is extended to solve the problem of non-isothermal phase-change heat and mass transfer in the growth of HgCdTe and CdZnTe crystals by numerical simulation of vertical Bridgman method. The partitioning of axial solute concentration is confirmed and studied The effects of crystal growth rate on the zoning and the one-dimensional transient non-isothermal phase transitions during the crystal growth were analyzed. The non-isothermal phase transition from the initial transition zone through the stable growth zone to the final transition zone was obtained. Numerical results.Furthermore, the position and shape of the two-dimensional axisymmetric phase change interface under steady-state condition were captured by numerical simulation, and the temperature field of melt and crystal was obtained. Finally, the transient pull The two-dimensional axisymmetric non-isothermal phase transformation during the crystallization process was compared with that of the isothermal phase transformation, and the effect of different crystal pulling speeds on the non-isothermal phase transformation was revealed.