Computational study of the role of surfactants in sheared foams for foam stability
Andrea Titta  1@  , Peter Spelt  2@  , Marie Le Merrer  1@  , François Detcheverry  1@  , Anne-Laure Biance  1@  
1 : Institut Lumière Matière  (ILM)  -  Site web
CNRS : UMR5306, Université Claude Bernard - Lyon I
Domaine Scientifique de La Doua Bâtiment Kastler, 10 rue Ada Byron 69622 Villeurbanne CEDEX -  France
2 : Laboratoire de Mecanique des Fluides et d'Acoustique  (LMFA)  -  Site web
CNRS : UMR5509, Université Claude Bernard - Lyon I (UCBL), Ecole Centrale de Lyon, Institut National des Sciences Appliquées [INSA] - Lyon
36 Av Guy de Collongue 69134 ECULLY CEDEX -  France

The dynamics of sheared wet foams is investigated computationally in this study. For this purpose, an established 3D (parallel) implementation of a level-set method for incompressible two-phase flow has been extended to account for the presence of surfactants that are soluble in the liquid, and the associated modified stress conditions at interfaces. In particular, we account for surface rheological behavior (such as surface viscosity) beyond minimal surfactant models, to describe realistic systems. The results of 2D and 3D tests will be demonstrated to compare favourably with the literature. We shall report on the role of surfactants and their properties on T1 events, wherein adjacent bubbles are sheared past each other, with implications for foam instability.

 


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