Linear stability of double-diffusive two-fluid channel flow

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

Full text not available from this repository. (Request a copy)

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.

[error in script]

IITH Creators: