Buoyant Convection During the Growth of Compound Semiconductors by the Liquid-Encapsulated Czochralski Process With an Axial Magnetic Field and With a Non-Axisymmetric Temperature

[+] Author and Article Information
Nancy Ma, J. S. Walker

Department of Mechanical and Industrial Engineering, 140 Mechanical Engineering Building, University of Illinois, Urbana, IL 61801

J. Fluids Eng 118(1), 155-159 (Mar 01, 1996) (5 pages) doi:10.1115/1.2817494 History: Received March 20, 1995; Revised November 06, 1995; Online December 04, 2007


This paper treats the buoyant convection of a molten semiconductor in a cylindrical crucible with a vertical axis, with a uniform vertical magnetic field, and with a non-axisymmetric temperature. Most previous treatments of melt motions with vertical magnetic fields have assumed that the temperature and buoyant convection were axisymmetric. In reality, the temperature and resultant buoyant convection often deviate significantly from axisymmetry. For a given non-axisymmetric temperature, the electromagnetic suppression of the axisymmetric part of the buoyant convection is stronger than that of the non-axisymmetric part, so that the deviation from an axisymmetric melt motion increases as the magnetic field strength is increased. The non-axisymmetric part of the buoyant convection includes relatively strong azimuthal velocities adjacent to the electrically insulating vertical crucible wall, because this wall blocks the radial electric currents needed to suppress azimuthal velocities.

Copyright © 1996 by The American Society of Mechanical Engineers
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