The solidification of a dilute alloy (bismuth-tin) under Bridgman crystal growth conditions is investigated. Computations are performed in two dimensions with a uniform grid. The simulation includes the species concentration, temperature and flow fields, as well as conduction in the ampoule. Fully transient simulations have been performed, with no simplifying steady state approximations. Results are obtained under microgravity conditions for pure bismuth, and for Bi-0.1 at.% Sn and Bi-1.0 at.% Sn alloys, and compared with experimental results obtained from crystals grown in the microgravity environment of space. For the Bi-1.0 at.% Sn case the results indicate that a secondary convective cell, driven by solutal gradients, forms near the interface. The magnitude of the velocities in this cell increases with time, causing increasing solute segregation at the solid/liquid interface. Finally, a comparison between model predictions and results obtained from a space experiment is reported. The concentration-dependence of the alloy melting temperature is incorporated in the model for this case. Satisfactory correspondence is obtained between the predicted and experimental results in terms of solute concentrations in the solidified crystal.
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Bridgman Crystal Growth of an Alloy With Thermosolutal Convection Under Microgravity Conditions
James E. Simpson,
James E. Simpson
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288
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Suresh V. Garimella,
Suresh V. Garimella
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288
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Henry C. de Groh, III,
Henry C. de Groh, III
NASA Glenn Research Center, Cleveland, OH 44135
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Reza Abbaschian
Reza Abbaschian
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
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James E. Simpson
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288
Suresh V. Garimella
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288
Henry C. de Groh, III
NASA Glenn Research Center, Cleveland, OH 44135
Reza Abbaschian
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division October 25, 1999; revision received March 13, 2001. Associate Editor: R. Mahajan.
J. Heat Transfer. Oct 2001, 123(5): 990-998 (9 pages)
Published Online: March 13, 2001
Article history
Received:
October 25, 1999
Revised:
March 13, 2001
Citation
Simpson , J. E., Garimella, S. V., de Groh , H. C., III, and Abbaschian, R. (March 13, 2001). "Bridgman Crystal Growth of an Alloy With Thermosolutal Convection Under Microgravity Conditions ." ASME. J. Heat Transfer. October 2001; 123(5): 990–998. https://doi.org/10.1115/1.1389058
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