Spatio-temporal linear stability of double-diffusive two-fluid channel flow

Sahu, K C and Govindarajan, R (2012) Spatio-temporal linear stability of double-diffusive two-fluid channel flow. Physics of Fluids, 24 (054103). 054103-1. ISSN 1070-6631

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Abstract

Absolute instabilities in shear flows can cause a catastrophic breakdown into a new unsteady state, or even into turbulence. We demonstrate that in a double-diffusive channel flow with a viscosity stratification across the channel, rapidly growing absolute instability may be obtained at Reynolds numbers of a few hundreds. The instability is much weaker in an equivalent single solute fluid with the same viscosity contrast, or even in one which is made up only of the more dangerous of the two diffusing species. This is a novel characteristic of double-diffusive systems driven by viscosity, rather than density variations. Convective instabilities too are stronger in the double-diffusive case.

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IITH Creators:
IITH CreatorsORCiD
Sahu, K Chttp://orcid.org/0000-0002-7357-1141
Item Type: Article
Subjects: Chemical Engineering > Biochemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Mr. Siva Shankar K
Date Deposited: 19 Sep 2014 06:53
Last Modified: 11 Jul 2017 03:43
URI: http://raiith.iith.ac.in/id/eprint/17
Publisher URL: https://doi.org/10.1063/1.4718775
OA policy: http://www.sherpa.ac.uk/romeo/issn/1070-6631/
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