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On the inviscid stability of parallel bubbly flows

Published online by Cambridge University Press:  25 May 1997

LUCA D'AGOSTINO ,
FABRIZIO D'AURIA  and
CHRISTOPHER E. BRENNEN
LUCA D'AGOSTINO
Affiliation:
Università degli studi di Pisa, Pisa 56125, Italy
FABRIZIO D'AURIA
Affiliation:
Università degli studi di Pisa, Pisa 56125, Italy
CHRISTOPHER E. BRENNEN
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

This paper investigates the effects of bubble dynamics on the stability of parallel bubbly flows of low void fraction. The equations of motion for the bubbly mixture are linearized for small perturbations and the parallel flow assumption is used to obtain a modified Rayleigh equation governing the inviscid stability problem. This is then used for the stability analysis of two-dimensional shear layers, jets and wakes. Inertial effects associated with the bubble response and energy dissipation due to the viscosity of the liquid, the heat transfer between the two phases, and the liquid compressibility are included. Numerical solutions of the eigenvalue problems for the modified Rayleigh equation are obtained by means of a multiple shooting method. Depending on the characteristic velocities of the various flows, the void fraction, and the ambient pressure, the presence of air bubbles can induce significant departures from the classical stability results for a single-phase fluid.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 339 , 25 May 1997 , pp. 261 - 274
Copyright
© 1997 Cambridge University Press

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