Effect of static magnetic field on a thermal conductivity measurement of a molten droplet using an electromagnetic levitation technique

Takao Tsukada, Ken ichi Sugioka, Tomoya Tsutsumino, Hiroyuki Fukuyama, Hidekazu Kobatake

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Recently, a novel method of measuring the thermophysical properties, particularly thermal conductivity, of high-temperature molten materials using the electromagnetic levitation technique has been developed by Kobatake et al. [H. Kobatake, H. Fukuyama, I. Minato, T. Tsukada, S. Awaji, Noncontact measurement of thermal conductivity of liquid silicon in a static magnetic field, Appl. Phys. Lett. 90 (2007) 094102]; this method is based on a periodic laser-heating method, and entails the superimposing of a static magnetic field to suppress convection in an electromagnetically levitated droplet. In this work, to confirm the fact that a static magnetic field really suppresses convection in a molten silicon droplet in an electromagnetic levitator, numerical simulations of convection in the droplet and periodic laser heating in the presence of convection have been carried out. Here, the convections driven by buoyancy force, thermocapillary force due to the temperature dependence of the surface tension on the melt surface, and electromagnetic force in the droplet were considered. As a result, it was found that applying a static magnetic field of 4 T can suppress convection in a molten silicon droplet enough to measure the real thermal conductivity of molten silicon.

Original languageEnglish
Pages (from-to)5152-5157
Number of pages6
JournalInternational Journal of Heat and Mass Transfer
Volume52
Issue number21-22
DOIs
Publication statusPublished - 2009 Oct

Keywords

  • Convection
  • Droplet
  • Electromagnetic levitation
  • Molten silicon
  • Numerical simulation
  • Static magnetic field
  • Thermal conductivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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