University of Illinois Urbana-Champaign

Effects of rotation on fully non-axisymmetric chimmey convection convection during alloy solidification

Riahi, Daniel N.

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https://hdl.handle.net/2142/112593

Description

Title
Effects of rotation on fully non-axisymmetric chimmey convection convection during alloy solidification
Author(s)
Riahi, Daniel N.
Issue Date
1998-09
Keyword(s)
  • Non-axisymmetric Chimmey Convection Convection
  • Alloy Solidification
Abstract
Nonlinear buoyancy driven convection in the melt and in cylindrical chimneys within a mushy layer during alloy solidification is investigated under a high-gravity environment, where the rotation axis is inclined at an angle γ to the high-gravity vector. In the final form of the solidified material these chimneys produce freckles, which are imperfections that reduce the quality of the solidified material. Asymptotic and scaling analyses are applied to fully non-axisymmetric convection in the finite-Prandtl-number (Pr) melt and in the chimneys. It is found that there are Pr- and rotation-dependent ranges where the wall of chimneys may or may not be vertical. There are also γ-, Pr- and rotation-dependent ranges where convection in the chimneys can increase or decrease with increasing rotation rate. The results are generally in agreement with available experimental observations.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 887
  • 1998-6013
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112593
Copyright and License Information
Copyright 1998 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.