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Shear instability of an axisymmetric air–water coaxial jet

Published online by Cambridge University Press:  23 March 2018

Jean-Philippe Matas Open the ORCID record for Jean-Philippe Matas [Opens in a new window] ,
Antoine Delon  and
Alain Cartellier
Jean-Philippe Matas*
Affiliation:
Laboratoire de Mécanique des Fluides et d’Acoustique, Ecole Centrale de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, F-69134 Ecully, France
Antoine Delon
Affiliation:
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institute of Engineering Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, France
Alain Cartellier
Affiliation:
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institute of Engineering Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, France
*
†Email address for correspondence: [email protected]
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Abstract

We study the destabilization of a round liquid jet by a fast annular gas stream. We measure the frequency of the shear instability waves for several geometries and air/water velocities. We then carry out a linear stability analysis, and show that there are three competing mechanisms for the destabilization: a convective instability, an absolute instability driven by surface tension and an absolute instability driven by confinement. We compare the predictions of this analysis with experimental results, and propose scaling laws for wave frequency in each regime. We finally introduce criteria to predict the boundaries between these three regimes.

JFM classification

Instability: Absolute/convective instability Wakes/Jets: Jets Wakes/Jets: Shear layers
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 843 , 25 May 2018 , pp. 575 - 600
Copyright
© 2018 Cambridge University Press 

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