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Inviscid versus viscous instability mechanism of an air–water mixing layer

Published online by Cambridge University Press:  06 March 2015

Jean-Philippe Matas
Jean-Philippe Matas*
Affiliation:
Université Grenoble Alpes, LEGI, CNRS, F-38000 Grenoble, France
*
†Email address for correspondence: matas@legi.grenoble-inp.fr
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Abstract

We study how confinement affects the viscous spatiotemporal instability of a two-phase mixing layer. We show that the absolute instability triggered by the inclusion of finite liquid and gas thicknesses leads to a good prediction of experimental data. In addition, this new mechanism provides a justification for the relevance of both simplified inviscid scaling laws and more sophisticated viscous approaches.

JFM classification

Instability: Absolute/convective instability Multiphase and Particle-laden Flows: Gas/liquid flow Wakes/Jets: Shear layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 768 , 10 April 2015 , pp. 375 - 387
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Copyright
© 2015 Cambridge University Press 

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