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Soret-driven thermosolutal convection

Published online by Cambridge University Press:  29 March 2006

D. T. J. Hurle  and
E. Jakeman
D. T. J. Hurle
Affiliation:
Royal Radar Establishment, Great Malvern, Worcs., U.K.
E. Jakeman
Affiliation:
Royal Radar Establishment, Great Malvern, Worcs., U.K.
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Abstract

The suggestion made by the authors in a previous paper (Hurle & Jakeman 1969) that the Soret effect could give rise to overstable solutions of the thermosolutal Rayleigh–Jeffreys problem is investigated theoretically and experimentally.

Oscillatory instability is shown to occur in initially homogeneous layers of water-methanol mixtures when they are heated from below. This instability triggers a finite-amplitude steady mode. The magnitude and sign of the Soret coefficient was changed by varying the composition of the mixture; as predicted, overstable modes were observed when the sign of the coefficient was such as to produce a stabilizing contribution to the density gradient. The observed critical Rayleigh numbers and temporal frequencies are consistent with theory.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 47 , Issue 4 , 29 June 1971 , pp. 667 - 687
Copyright
© 1971 Cambridge University Press

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