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Experiments on the fragmentation of a buoyant liquid volume in another liquid

Published online by Cambridge University Press:  16 May 2014

M. Landeau ,
R. Deguen  and
P. Olson
M. Landeau*
Affiliation:
Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA Dynamique des Fluides Géologiques, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, CNRS UMR 7154, 1 rue Jussieu 75238 Paris CEDEX 5, France
R. Deguen
Affiliation:
Laboratoire de Géologie de Lyon, Université Lyon 1, 2 rue Raphaël Dubois, 69622 Villeurbanne, France Institut de Mécanique des Fluides de Toulouse, Université de Toulouse (INPT, UPS) and CNRS, 2 allée Camille Soula, Toulouse, 31400, France
P. Olson
Affiliation:
Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA
*
†Email address for correspondence: mlandeau@jhu.edu
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Abstract

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We present experiments on the instability and fragmentation of volumes of heavier liquids released into lighter immiscible liquids. We focus on the regime defined by small Ohnesorge numbers, density ratios of the order of one, and variable Weber numbers. The observed stages in the fragmentation process include deformation of the released fluid by either Rayleigh–Taylor instability (RTI) or vortex ring roll-up and destabilization, formation of filamentary structures, capillary instability, and drop formation. At low and intermediate Weber numbers, a wide variety of fragmentation regimes is identified. Those regimes depend on early deformations, which mainly result from a competition between the growth of RTI and the roll-up of a vortex ring. At high Weber numbers, turbulent vortex ring formation is observed. We have adapted the standard theory of turbulent entrainment to buoyant vortex rings with initial momentum. We find consistency between this theory and our experiments, indicating that the concept of turbulent entrainment is valid for non-dispersed immiscible fluids at large Weber and Reynolds numbers.

JFM classification

Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Drops Convection: Plumes/thermals
Type
Papers
Information
Journal of Fluid Mechanics , Volume 749 , 25 June 2014 , pp. 478 - 518
Copyright
© 2014 Cambridge University Press 

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Landeau et al. supplementary movie

Movie of an experiment in the RT piercing fragmentation regime, We≈70, P≈0.22, Immersed configuration (24 frames per second).

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Landeau et al. supplementary movie

Movie of an experiment in the vortex ring destabilization regime, We≈40, P≈0.22, Surface configuration (24 frames per second).

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Video 715.2 KB

Landeau et al. supplementary movie

Movie of an experiment in the turbulent regime, immiscible turbulent thermal, We ≈ 1000, P ≈ 0.92, Immersed configuration (24 frames per second).

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