Modeling and simulation on melt flow and thermal in crystal growth

Abstract

A coupled thermal flow crystal growth model based on Lattice Boltzmann Method (LBM) is constructed for the internal melt in a single crystal furnace, according to the characteristic that the internal temperature distribution of the melt is difficult to measure. Considering the melt's characteristic on the free surface boundary, the specular reflection scheme is used on the free surface. The flow pattern and the temperature of the internal melt under different growth environment are simulated by the proposed model. Simulation results show that, in the pure heating environment, the fiercer melt flows, the greater the temperature gradient below the crystal growth interface, and the more uneven the temperature distribution on the free surface; crystal rotation and crucible rotation reduce the temperature gradient below the growth interface, and improve the temperature distribution uniformity of the free surface. The simulation result is consistent with the experiment result, which proves the correctness of the simulation model and the boundary scheme on the free surface.