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Coupled convective and morphological instability in a simple-model of the solidification of a binary alloy, including a shear-flow

Forth, S.A. and Wheeler, A.A. (1992) Coupled convective and morphological instability in a simple-model of the solidification of a binary alloy, including a shear-flow Journal of Fluid Mechanics, 236, pp. 61-94.

Record type: Article

Abstract

In this paper we provide a detailed description of the interaction of solutal convection and morphological instability in the presence of a model boundary-layer flow. We present a detailed investigation of the structure of the marginal surfaces in Rayleigh-number, Sekerka-number, Reynolds-number space associated with a linear stability analysis. We give mathematical arguments and physical mechanisms to explain the results and present a coherent description of this complicated situation. We identify two new modes, one convective and one morphological. We show that the oscillatory so-called 'mixed' modes that result from the coupling of morphological and convective modes play a central role in the unfolding of the solution structure by the shear flow. This flow has the effect of decoupling the convective and morphological modes.

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More information

Published date: 1992
Keywords: Directional solidification, unidirectional solidification, solutal convection, stability, interface, growth, melt

Identifiers

Local EPrints ID: 815
URI: http://eprints.soton.ac.uk/id/eprint/815
ISSN: 0022-1120
PURE UUID: 4fcc1a98-673e-4621-955c-b41fc0911565

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Date deposited: 25 Mar 2004
Last modified: 17 Jul 2017 17:17

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Contributors

Author: S.A. Forth
Author: A.A. Wheeler

University divisions

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