Linear stability of double-diffusive two-fluid channel flow

Sahu, K C and Govindarajan, R (2011) Linear stability of double-diffusive two-fluid channel flow. Journal of Fluid Mechanics, 687. pp. 529-539. ISSN 0022-1120

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Abstract

Double-diffusive density stratified systems are well studied and have been shown to display a rich variety of instability behaviour. However double-diffusive systems where the inhomogeneities in solute concentration are manifested in terms of stratified viscosity rather than density have been studied far less and, to the best of the authors' knowledge, not in high-Reynolds-number shear flows. In a simple geometry, namely the two-fluid channel flow of such a system, we find a new double-diffusive mode of instability. The instability becomes stronger as the ratio of diffusivities of the two scalars increases, even in a situation where the net Schmidt number decreases. The double-diffusive mode is destabilized when the layer of viscosity stratification overlaps with the critical layer of the perturbation.

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IITH Creators:
IITH CreatorsORCiD
Sahu, K Chttp://orcid.org/0000-0002-7357-1141
Item Type: Article
Uncontrolled Keywords: double diffusive convection; multiphase flow; transition to turbulence
Subjects: Chemical Engineering > Biochemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Team Library
Date Deposited: 29 Oct 2014 09:10
Last Modified: 11 Jul 2017 03:46
URI: http://raiith.iith.ac.in/id/eprint/523
Publisher URL: https://doi.org/10.1017/jfm.2011.388
OA policy: http://www.sherpa.ac.uk/romeo/issn/0022-1120/
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