Effects of static magnetic fields on melt flow in detached solidification
(Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education,
College of Power Engineering, Chongqing University, Chongqing 400044, China)
College of Power Engineering, Chongqing University, Chongqing 400044, China)
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.
Key words: detached solidification; static magnetic field; thermocapillary-buoyancy convection; numerical simulation; CdZnTe