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Bridgman crystal growth in low gravity - A scaling analysisThe results of an order-of-magnitude or scaling analysis are compared with those of numerical simulations of the effects of steady low gravity on compositional nonuniformity in crystals grown by the Bridgman-Stockbarger technique. In particular, the results are examined of numerical simulations of the effect of steady residual acceleration on the transport of solute in a gallium-doped germanium melt during directional solidification under low-gravity conditions. The results are interpreted in terms of the relevant dimensionless groups associated with the process, and scaling techniques are evaluated by comparing their predictions with the numerical results. It is demonstrated that, when convective transport is comparable with diffusive transport, some specific knowledge of the behavior of the system is required before scaling arguments can be used to make reasonable predictions.
Document ID
19920034431
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Alexander, J. I. D.
(Alabama Univ. Huntsville, AL, United States)
Rosenberger, Franz
(Alabama, University Huntsville, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Materials Processing
Accession Number
92A17055
Funding Number(s)
CONTRACT_GRANT: NAG8-684
CONTRACT_GRANT: NAG8-724
Distribution Limits
Public
Copyright
Other

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