【摘要】 采用三维数值模拟手段对微重力条件下熔体内部的热毛细对流以及常重力条件下熔体内部的热毛细-浮力对流进行研究。模拟中选取无磁场、施加轴向磁场和施加勾形磁场3种不同的磁场条件进行对比。模拟结果表明,轴向磁场和勾形磁场都能够有效地抑制熔体内部的流动和温度波动;在相同磁场强度下,轴向磁场的抑制效果比勾形磁场更为显著。此外,还对重力条件下熔体内部热毛细-浮力对流的失稳机理进行分析,以研究磁场对临界Ma数的影响。更多还原

【Abstract】 A series of three-dimensional numerical computations were conducted to understand the effects of different static magnetic fields on thermal fluctuation and melt flow during the detached solidification of CdZnTe.Numerical calculations were carried out by three different configurations of magnetic field:without magnetic field,with an axial magnetic field(AMF) and with a cusp-shaped magnetic field(CMF).The results reveal that the magnetic fields can effectively suppress the melt flow and thermal fluctuation and the suppression effect of the AMF is stronger than that of the CMF.Besides,the physical mechanism of thermocapillary-buoyancy convection instability was discussed and the effects of magnetic field on the critical Marangoni number were also obtained.更多还原