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Effect of convection on the microstructure of a lamellar eutectic growing with a stepped interfaceA two dimensional model developed to study the influence of convective flow on the concentration field ahead of a growing lamellar eutectic is described when one phase projects out into the melt creating a stepped interface. The two dimensional convective flow field, which is periodic in the horizontal direction, was computed numerically using the software FLUENT. The velocity field generated due to the flow of melt over the steps was then incorporated into a finite difference scheme employed to solve the concentration field. The average interfacial composition was calculated and converted to lamellar spacing using the Jackson and Hunt minimum supercooling criterion. It was found that a stepped interface is more sensitive to convection than a planar interface.
Document ID
19920042808
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Seth, Jayshree
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Wilcox, W. R.
(Clarkson University Potsdam, NY, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Journal of Crystal Growth
Volume: 114
Issue: 3
ISSN: 0022-0248
Subject Category
Materials Processing
Accession Number
92A25432
Funding Number(s)
CONTRACT_GRANT: NAG8-753
Distribution Limits
Public
Copyright
Other

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