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Experiments with constrained chimney-plume flows in the system ammonium chloride–water: comparison with the unconstrained case

Published online by Cambridge University Press:  10 June 1999

SHAN LIU  and
ANGUS HELLAWELL
SHAN LIU
Affiliation:
Metallurgical and Materials Engineering Department, Michigan Technological University, Houghton, MI 49931, USA
ANGUS HELLAWELL
Affiliation:
Metallurgical and Materials Engineering Department, Michigan Technological University, Houghton, MI 49931, USA
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Abstract

Thermo-solutal chimney-plume flows from a solidifying dendritic mushy region have been promoted in thin-walled glass tubes of internal radii from 0.3 mm–2.0 mm. Flow rates, liquid compositions and temperatures were measured as functions of the depth of immersion of capillary tubes in the advancing mushy region. The results demonstrate competition between buoyancy pressures and the restrictions of liquid recirculation within the dendritic array and have been analysed to provide permeability data for the mushy region at high liquid fractions. These data have been used to make some assessments of channel/plume dimensions for naturally occurring, unconstrained flows in the same system.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 388 , 10 June 1999 , pp. 21 - 48
Copyright
© 1999 Cambridge University Press

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