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Turbulent bubbly flow in pipe under gravity and microgravity conditions

Published online by Cambridge University Press:  27 September 2012

Catherine Colin ,
Jean Fabre  and
Arjan Kamp
Catherine Colin
Affiliation:
Institut de Mécanique des Fluides, Institut National Polytechnique de Toulouse, Allée du Prof. Camille Soula, 31400 Toulouse, France
Jean Fabre*
Affiliation:
Institut de Mécanique des Fluides, Institut National Polytechnique de Toulouse, Allée du Prof. Camille Soula, 31400 Toulouse, France
Arjan Kamp
Affiliation:
Centre Scientifique et Technique Jean-Féger, TOTAL, Avenue Larribau, 64018 Pau, France
*
†Email address for correspondence: Jean.Fabre@imft.fr
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Abstract

Experiments on vertical turbulent flow with millimetric bubbles, under three gravity conditions, upward, downward and microgravity flows (, and ), have been performed to understand the influence of gravity upon the flow structure and the phase distribution. The mean and fluctuating phase velocities, shear stress, turbulence production, gas fraction and bubble size have been measured or determined. The results for flow obtained during parabolic flights are taken as reference for buoyant and flows. Three buoyancy numbers are introduced to understand and quantify the effects of gravity with respect to friction. We show that the kinematic structure of the liquid is similar to single-phase flow for flow whereas it deviates in and buoyant flows. The present results confirm the existence of a two-layer structure for buoyant flows with a nearly homogeneous core and a wall layer similar to the single-phase inertial layer whose thickness seems to result from a friction–gravity balance. The distributions of phase velocity, shear stress and turbulence are discussed in the light of various existing physical models. This leads to a dimensionless correlation that quantifies the wall shear stress increase due to buoyancy. The turbulent dispersion, the lift and the nonlinear effects of added mass are taken into account in a simplified model for the phase distribution. Its analytical solution gives a qualitative description of the gas fraction distribution in the wall layer.

JFM classification

Drops and Bubbles: Bubble dynamics Multiphase and Particle-laden Flows: Gas/liquid flow

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Type
Papers
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Journal of Fluid Mechanics , Volume 711 , 25 November 2012 , pp. 469 - 515
Copyright
Copyright © Cambridge University Press 2012

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