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RESEARCH PAPERS: Heat Conduction With Solidification

Magnetically Damped Convection During Solidification of a Binary Metal Alloy

[+] Author and Article Information
P. J. Prescott, F. P. Incropera

Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Heat Transfer 115(2), 302-310 (May 01, 1993) (9 pages) doi:10.1115/1.2910680 History: Received July 01, 1992; Revised November 01, 1992; Online May 23, 2008

Abstract

The transient transport of momentum, energy, and species during solidification of a Pb-19 percent Sn alloy is numerically simulated with and without magnetic damping. The system is contained in an axisymmetric, annular mold, which is cooled along its outer vertical wall. Since thermosolutal convection accompanies solidification and is responsible for final macrosegregation patterns, application of a steady magnetic field, which is parallel to the axis of the mold, has the potential to reduce macrosegregation by damping buoyancy-driven flow during solidification. Results show that, during early stages of solidification, the magnetic field significantly affects thermally driven flow in the melt, as well as interactions between thermally and solutally driven flows. However, interdendritic flows and macrosegregation patterns are not significantly altered by moderate magnetic fields. Scaling analysis reveals that extremely strong fields would be required to effectively dampen convection patterns that contribute to macrosegregation.

Copyright © 1993 by The American Society of Mechanical Engineers
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