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Three-dimensional free convection in molten gallium

Published online by Cambridge University Press:  22 June 2001

A. JUEL ,
T. MULLIN ,
H. BEN HADID  and
D. HENRY
A. JUEL
Affiliation:
Schuster laboratory, The University of Manchester, Manchester M13 9PL, UK
T. MULLIN
Affiliation:
Schuster laboratory, The University of Manchester, Manchester M13 9PL, UK
H. BEN HADID
Affiliation:
Laboratoire de Mécanique des Fluides et d'Acoustique UMR 5509, Ecole Centrale de Lyon/Université Claude Bernard Lyon 1, ECL, BP 163, 69131 Ecully Cedex, France
D. HENRY
Affiliation:
Laboratoire de Mécanique des Fluides et d'Acoustique UMR 5509, Ecole Centrale de Lyon/Université Claude Bernard Lyon 1, ECL, BP 163, 69131 Ecully Cedex, France
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Abstract

Convective flow of molten gallium is studied in a small-aspect-ratio rectangular, differentially heated enclosure. The three-dimensional nature of the steady flow is clearly demonstrated by quantitative comparison between experimental temperature measurements, which give an indication of the strength of the convective flow, and the results of numerical simulations. The three-dimensional flow structure is characterized by cross-flows which are an order of magnitude smaller than the main circulation, and spread from the endwall regions to the entire enclosure when the Grashof number is increased beyond Gr = 104. The mergence of these effects in the centre of the enclosure leads to a complex central divergent flow structure which underpins the observed transition to oscillatory convection.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 436 , 10 June 2001 , pp. 267 - 281
Copyright
© 2001 Cambridge University Press

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