Effect of Anisotropic Solid-Phase Thermal Conductivity on Vertical Bridgman Growth
Lee, Hanjie
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https://hdl.handle.net/2142/83993
Description
Title
Effect of Anisotropic Solid-Phase Thermal Conductivity on Vertical Bridgman Growth
Author(s)
Lee, Hanjie
Issue Date
1999
Doctoral Committee Chair(s)
Pearlstein, Arne J.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
The results for Bridgman growth of thermally anisotropic materials are illustrated for benzene, for which the thermal conductivity has been measured parallel and perpendicular to the growth direction of directionally solidified specimens. We study the effects of anisotropy by performing computations using measured components of the thermal conductivity tensor, and by considering macroscopically isotropic (e.g., polycrystalline) solid benzene, as well as fictitious materials whose properties differ from those of benzene only in that they have a larger solidphase conductivity in the direction of growth. Besides concave and convex interface shapes, commonly associated with vertical Bridgman growth, we also find, for a range of solidification conditions, interface shapes that are neither concave nor convex. We find that increasing the conductivity parallel to the growth direction has the effect of planarizing the interface over a large central core, and increasing the curvature near the wall. Differences between our computation and those not accounting for flow are discussed.
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