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Drop breakup modelling in turbulent flows

Lalanne, Benjamin and Tanguy, Sébastien and Vejražka, Jiří and Masbernat, Olivier and Risso, Frédéric Drop breakup modelling in turbulent flows. (2014) In: 10th International Conference on Computational Fluid Dynamics in the Oil & Gas, Metallurgical and Process Industries - CFD 2014, 17 June 2014 - 19 June 2014 (Trondheim, Norway).

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Abstract

This paper deals with drop and bubble break-up modelling in turbulent flows. We consider the case where the drop/bubble slip velocity is smaller than or of the order of the turbulent velocity scales, or when the drop/bubble deformation is mainly caused by the turbulent stress (atomisation is not addressed here). The deformation of a drop is caused by continuous interactions with turbulent vortices; the drop responds to these interactions by performing shape-oscillations and breaks up when its deformation reaches a critical value. Following these observations, we use a model of forced oscillator that describes the drop deformation dynamics in the flow to predict its break-up probability. Such a model requires a characterization of the shape- oscillation dynamics of the drop. As this dynamics is theoretically known only under restrictive conditions (without gravity, surfactants), CFD two-phase flow simulations, based on the Level-Set and Ghost Fluid methods, are used to determine the interface dynamics in more complex situations: deformation of a drop in the presence of gravity, bubble-vortex interactions. Results are compared with experimental data. The perspectives to apply this model to breakup in emulsification processes are also discussed.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to CFD editor. The definitive version is available at http://www.sintef.no The original PDF of the article can be found at CFD website : http://www.sintef.no/globalassets/project/cdf2014/docs/official_proceedings_cfd2014-redusert-filstr.pdf
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Other partners > Academy of Sciences (CZECH REPUBLIC)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Benjamin LALANNE
Deposited On:26 Jun 2015 15:58

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