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Dynamics of drop breakup in inhomogeneous turbulence at various volume fractions

Published online by Cambridge University Press:  26 April 2007

SOPHIE GALINAT ,
FRÉDÉRIC RISSO ,
OLIVIER MASBERNAT  and
PASCAL GUIRAUD
SOPHIE GALINAT
Affiliation:
Laboratoire de Génie Chimique, UMR 5503 CNRS-INP-UPS, 5 rue Paulin Talabot, 31106 Toulouse Cedex 1, France
FRÉDÉRIC RISSO*
Affiliation:
Institut de Mécanique des Fluides de Toulouse, UMR 5502 CNRS-INP-UPS, Allée C. Soula, 31400 Toulouse, France
OLIVIER MASBERNAT
Affiliation:
Laboratoire de Génie Chimique, UMR 5503 CNRS-INP-UPS, 5 rue Paulin Talabot, 31106 Toulouse Cedex 1, France
PASCAL GUIRAUD
Affiliation:
Laboratoire d'Ingénierie des Procédés de l'Environnement, INSA Toulouse, 135 avenue de Rangueil, 31077 Toulouse Cedex 4, France
*
†Author to whom correspondence should be addressed: risso@imft.fr
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Abstract

We report experimental and numerical determinations of the breakup probability of a drop travelling through inhomogeneous turbulent flow generated in a pipe downstream of a restriction. The model couples the Rayleigh–Lamb theory of drop oscillations with the Kolmogorov–Hinze theory of turbulent breakup. The interface deformation is modelled by a linear oscillator forced by the Lagrangian turbulent Weber number measured in experiments. The interface is assumed to rupture when either (i) the instantaneous Weber number exceeds a critical value or (ii) the predicted deformation exceeds a given threshold. Seven flow configurations have been tested, corresponding to various Reynolds numbers, damping coefficients and drop volume fractions. The history of the drop deformation proves to play an important role, and simulations assuming a critical Weber number fail to reproduce the experiments. Simulations assuming a critical deformation predict well the main features observed in the experiments. The linear oscillator appears able to describe the main feature of the dynamics of the drop deformation in inhomogeneous turbulence. Provided the oscillation frequency and the damping rate are known, the model can be used to compute the breakup probability in concentrated dispersed two-phase flows.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 578 , 10 May 2007 , pp. 85 - 94
Copyright
Copyright © Cambridge University Press 2007

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