Analysis of Convective Instability in Melt of Floating Zone Crystal Growth with Different Aspect Ratio

Abstract

Abstract: In this paper, the evolution of thermocapillary convection in melt of half-floating zone liquid bridge under the condition of zero gravity was studied by means of numerical simulation. Under the condition that the height L of the liquid bridge and the temperature difference ΔT remain unchanged, the aspect ratio (Ar=L/R) of the liquid bridge can be changed by changing the radius R of the liquid bridge. The convection in the liquid bridge exhibits various flow characteristics with the change of the aspect ratio Ar. Thermocapillary convection is in a three-dimensional steady state when Ar=0.5. The flow field and temperature field change from the steady state mode to the unsteady periodic multi-frequency oscillation mode satisfying the frequency doubling relationship (f_n=nf₁) when Ar=1. When Ar=1.25, the velocity oscillation frequency of the monitoring point increases, showing a smaller amplitude oscillation mode, and the temperature oscillation disappears.

Key words: floating zone crystal growth, liquid bridge, thermocapillary convection, aspect ratio, numerical simulation, melt

CLC Number:

WANG Miaomiao, ZHANG Chuancheng, REN Hao, TANG Xubing, DING Shoujun, ZOU Yong, HUANG Hulin. Analysis of Convective Instability in Melt of Floating Zone Crystal Growth with Different Aspect Ratio[J]. Journal of Synthetic Crystals, 2023, 52(2): 220-228.

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