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Proceedings Paper

Novel method to detect flow profiles in liquid metals in a Bridgman configuration
Author(s): S. R. Prasad; C. Mallika; Timothy J. Anderson; Ranga Narayanan
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Paper Abstract

A solid state electrochemical method for flow visualization was developed to investigate the orientation of flow due to natural convection in semiconductor melts, contained in a simulated vertical Bridgman configuration. The Bridgman ampoule was constructed from recrystallized alumina and multiple solid-state electrochemical cells/sensors were incorporated along the periphery of the ampoule, electrically insulated from one another. Liquid tin was used as the model fluid to represent a high temperature, low Prandtl number, opaque Bridgman melt. Atomic oxygen was used as a tracer species, which could be potenstiostatically injected or extracted locally at one of the sensors and the oxygen concentration changes were monitored at the other cell locations on the melt/electrolyte boundaries in the potentiometric mode as a function of time. Various convective flow patterns were inferred from these results for different aspect ratios of the melt and as a function of the imposed temperature gradient. The experimental results were shown to agree well with theoretical predictions. The technique was also able to discern transcritical points in the dynamic state of the melt.

Paper Details

Date Published: 7 July 1997
PDF: 9 pages
Proc. SPIE 3123, Materials Research in Low Gravity, (7 July 1997); doi: 10.1117/12.277731
Show Author Affiliations
S. R. Prasad, Univ. of Florida (United States)
C. Mallika, Univ. of Florida (United States)
Timothy J. Anderson, Univ. of Florida (United States)
Ranga Narayanan, Univ. of Florida (United States)

Published in SPIE Proceedings Vol. 3123:
Materials Research in Low Gravity
Narayanan Ramachandran, Editor(s)

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