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

Liping Yao, Zhong Zeng, Xiaohong Li, Jingqiu Chen, Yongxiang Zhang, Hiroshi Mizuseki, Yoshiyuki Kawazoe

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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 λ=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.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalJournal of Crystal Growth
Volume316
Issue number1
DOIs
Publication statusPublished - 2011 Feb 1

Keywords

  • A1. Computer simulation
  • A1. Rotating magnetic fields
  • A1. Thermocapillary flow
  • A2. Floating zone technique
  • A2. Microgravity conditions
  • B2. Semiconducting materials

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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