Laboratoire de Mécanique des Fluides et d'Acoustique - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Accueil > Activités de Recherche > Fluides Complexes et Transferts > Séminaire du groupe > Archives (2016)

le 02 juin 2016 - Andrea TITTA
Computational study of the role of surfactants in sheared foams for foam stability

13h @ Amphi, Bibliothèque de l’INSA (Doua)

 le 02 juin 2016 - Andrea TITTA Computational study of the role of surfactants in sheared foams for foam stability

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, and on the onset of bubble coalescence, with implications for foam instability.

* Support from grant ARC Energie, by Rhône-Alpes region, is gratefully acknowledged.

Sheared foams : computations using Level-Set method

Andrea TITTA est un doctorant de 2ème année avec Peter SPELT & Anne-Laure Biance