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Proceedings Paper

Control of convection during directional solidification in terrestrial and low gravity
Author(s): C. Marin; Aleksandar G. Ostrogorsky
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Paper Abstract

The key parameters controlling the interference of convection with segregation are examined. A numerical model was developed to evaluate the suitability of the Peclet number and the Segregation number for predicting segregation behavior in microgravity. The model demonstrates the drawbacks of the Peclet number. The recently proposed Segregation number includes the equilibrium segregation coefficient k and the growth rate R and therefore appears to be a more appropriate scaling parameter for predicting segregation behavior in space experiments. On earth, diffusion-controlled growth is possible only in very small melts, under special conditions. When diffusion-controlled growth is not feasible, controlled stirring is preferred to the free convection. The advantages of steady forced convection over the unsteady unpredictable natural convection are discussed.

Paper Details

Date Published: 6 July 1999
PDF: 12 pages
Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); doi: 10.1117/12.351269
Show Author Affiliations
C. Marin, Univ. of Alabama in Huntsville (United States)
Aleksandar G. Ostrogorsky, Univ. of Alabama in Huntsville (United States)

Published in SPIE Proceedings Vol. 3792:
Materials Research in Low Gravity II
Narayanan Ramachandran, Editor(s)

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