University of Illinois Urbana-Champaign

High rayleigh number convection in rotating melt during alloy solidification

Riahi, Daniel N.

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https://hdl.handle.net/2142/112621

Description

Title
High rayleigh number convection in rotating melt during alloy solidification
Author(s)
Riahi, Daniel N.
Issue Date
1999-07
Keyword(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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 913
  • 1999-6015
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112621
Copyright and License Information
Copyright 1999 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.