Effects of rotating magnetic fields on thermocapillary flow in a floating half-zone

被引：14

作者：

Yao, Liping ^{[1
]}

Zeng, Zhong ^{[1
]}

Li, Xiaohong ^{[1
]}

Chen, Jingqiu ^{[1
]}

Zhang, Yongxiang ^{[1
]}

Mizuseki, Hiroshi ^{[2
]}

Kawazoe, Yoshiyuki ^{[2
]}

机构：

[1] Chongqing Univ, Coll Resources & Environm Sci, Dept Engn Mech, Chongqing 400044, Peoples R China

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2011年 / 316卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Computer simulation; Rotating magnetic fields; Thermocapillary flow; Floating zone technique; Microgravity conditions; Semiconducting materials; PHASE DIFFUSION GROWTH; MARANGONI CONVECTION; NUMERICAL-SIMULATION; LIQUID BRIDGE; MELT FLOW; SILICON; INSTABILITY; TRANSPORT;

D O I：

10.1016/j.jcrysgro.2010.12.065

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Three-dimensional numerical simulation of thermocapillary flow in a floating half-zone is performed. The effects of rotating magnetic fields (RMF) on thermocapillary flow of semiconductor melt (Pr=0.01) under microgravity are investigated. With increase in the Marangoni number (Ma) from 15 to 75, the melt flow loses stability changing from a steady axisymmetric flow to a three-dimensional steady flow, and then to a three-dimensional oscillatory flow. Due to the excellent electrical conductivity of the semiconductor melt, the induced Lorentz force under RMF with rotating frequency lambda=50 Hz is effective in stirring the melt in the azimuthal direction and suppressing axial convection, which are both effective in returning the thermocapillary flow after the first and second instabilities to a steady axisymmetric flow. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：177 / 184

页数：8

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