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TECHNICAL PAPERS: Heat Transfer in Manufacturing

Bridgman Crystal Growth of an Alloy With Thermosolutal Convection Under Microgravity Conditions

[+] Author and Article Information
James E. Simpson, Suresh V. Garimella

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288e-mail: sureshg@ecn.purdue.edu

Henry C. de Groh

NASA Glenn Research Center, Cleveland, OH 44135

Reza Abbaschian

Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611

J. Heat Transfer 123(5), 990-998 (Mar 13, 2001) (9 pages) doi:10.1115/1.1389058 History: Received October 25, 1999; Revised March 13, 2001
Copyright © 2001 by ASME
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Figures

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Traces of solute concentration across the solidified material at various x-locations for Bi-1.0 at.% Sn. The dotted lines correspond to diffusion only (no convection) results.
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Longitudinal solute concentration traces at three different y-locations for Bi-1.0 at.% Sn
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A comparison of average concentration values in the solidified material. The solid line is the one-dimensional analytical result of Smith et al. 24.
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A comparison of numerically predicted and experimentally measured concentration values for the Bridgman growth of Bi-1.0 at.% Sn. The numerical results are shown for simulations with and without the effect of concentration-dependent melting temperature being included. Reasonable agreement is observed between experimental data and numerical results including concentration-dependent melting temperature.
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Schematic of the Bridgman crystal growth process and furnace temperature profile
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Velocity vectors and isotherms for the Bridgman growth of pure bismuth at (a) 3000, (b) 6000, and (c) 9000 s. The thick solid line indicates the location of the solid/liquid interface. The velocity vectors are shown at every third location in the x-direction.
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Traces of solute concentration across the solidified material at various x-locations for Bi-0.1 at.% Sn. The dotted lines correspond to diffusion only (no convection) results.
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Longitudinal solute concentration traces at three different y-locations for Bi-0.1 at.% Sn
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Velocity vectors and isotherms for the Bridgman growth of Bi-1.0 at.% Sn at (a) 3000, (b) 6000, and (c) 9000 s. The thick solid line indicates the location of the solid/liquid interface. A primary counter-clockwise convective cell is evident in all three panels. A secondary clockwise cell, driven by solutal gradients, develops with time.

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