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Measurement of interstitial velocity of homogeneous bubbly flows at low to moderate void fraction

Published online by Cambridge University Press:  23 January 2007

V. ROIG  and
A. LARUE DE TOURNEMINE
V. ROIG
Affiliation:
Institut de Mécanique des Fluides de Toulouse, UMR 5502 CNRS-INP-UPS, Allée C. Soula, 31400 Toulouse, France
A. LARUE DE TOURNEMINE
Affiliation:
Institut de Mécanique des Fluides de Toulouse, UMR 5502 CNRS-INP-UPS, Allée C. Soula, 31400 Toulouse, France
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Abstract

We develop a new methodology to examine the conditional and unconditional vertical velocity induced by high-Reynolds-number bubbles rising in a uniform flow, at low to moderate void fraction α (up to 15%). These statistics provide a local description of the perturbation of the liquid velocity around a test bubble in the swarm. In particular, the attenuation of the length of the wakes with increasing void fraction is measured for a large range of void fraction. The strong attenuation of the wakes is related to wake intermingling mechanisms. The methodology also enables a definition of the interstitial liquid flow. The velocity of the fluid averaged over all the interstitial volume far away from the bubbles is introduced. It is a useful concept, in particular to define the relative velocity, or for drift models. Our experimental results allow a discussion of the predictions of irrotational drift models. For low void fraction (α≤2%), potential flow models provide practical estimates of the interstitial velocity field. At higher void fractions, the effect of vorticity is important. A simple phenomenological model is proposed to include the effect of the flow generated by the bubble wakes.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 572 , February 2007 , pp. 87 - 110
Copyright
Copyright © Cambridge University Press 2007

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