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Title:High rayleigh number convection in rotating melt during alloy solidification
Author(s):Riahi, Daniel N.
Subject(s):Rayleigh Number Convection
Alloy Solidification
Abstract:This paper reviews high Rayleigh number compositional convection in the melt and in cylindrical chimneys within a mushy layer during alloy solidification and under external constraint of rotation. These chimneys produce freckles in the final form of the solidified material, which are imperfections that reduce the quality of the solidified materials. External constraint of rotation imposed on the solidification system is used to predict particular ranges of the parameter values under which undesirable chimney convection can be suppressed or reduced as much as possible leading to elimination or reduction of the effects of chimneys as much as possible . Asymptotic and scaling analyses can be applied effectively to both axisymmetric and non-axisymmetric convection in the melt and in the chimneys to determine the effects of the centrifugal and Coriolis forces on the motion of the melt. The flow system is reviewed here for high or moderate values of the Prandtl number, and new results are also reported in this paper for such parameter regime.
Issue Date:1999-07
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 913
Genre:Technical Report
Rights Information:Copyright 1999 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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