University of Illinois Urbana-Champaign

Oscillatory instabilities of the liquid and mushy layers during solidification of alloys under rotational constraint

Sayre, Tracy L.; Riahi, Daniel N.

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https://hdl.handle.net/2142/112507

Description

Title
Oscillatory instabilities of the liquid and mushy layers during solidification of alloys under rotational constraint
Author(s)
  • Sayre, Tracy L.
  • Riahi, Daniel N.
Issue Date
1995-09
Keyword(s)
  • Matrix-reinforcement Interface
  • Diffusion Coefficient
  • Composite Materials
  • High Temperatures
Abstract
Linear flow instabilities due to oscillatory disturbances of the liquid and mushy regions during solidification of binary alloys are investigated under a rotational constraint where the rotation axis is inclined to the gravity vector. Results of stability analyses and numerical computations for a preferred centrifugal mode of general oscillatory disturbances at zero and non-zero rotation rates are determined which provide information about the preference of oscillatory flow and its role on the solidification system as modified .by the rotational effects. The main results are due to a preferred oscillatory mode of convection which is more significant for non-zero rotation case and is restricted mostly to the mushy region. The preferred oscillatory mode of convection is a traveling wave in the presence of rotation, but it is a standing wave in the absence of rotation. The results for different Prandtl numbers indicate that the freckles formation tendency for metallic alloys is less than that for aqueous solutions. Freckles are imperfections that reduce the quality of the solidified materials.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 808
  • 1995-6030
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112507
Copyright and License Information
Copyright 1995 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.