Aller au contenu. | Aller à la navigation

Outils personnels


UMR 5672

logo de l'ENS de Lyon
logo du CNRS
Vous êtes ici : Accueil / Séminaires / Colloquium / Marangoni flows.

Marangoni flows.

Isabelle Cantat (Institut de Physique de Rennes)
Quand ? Le 25/04/2016,
de 11:00 à 12:00
Où ? Amphi. Schrödinger
Participants Isabelle Cantat
Ajouter un événement au calendrier vCal

Surfactant distribution heterogeneities at a fluid/fluid interface trigger the Marangoni effect, i.e. a bulk flow due to a surface tension gradient. These flows are important at small scale, for exemple to control bubble or drop motion, or flows in diphasic medium. In the case of surfactant-induced Marangoni flows, surfactant solubility leads to coupled problems involving hydrodynamics, diffusive and convective transport and free interfaces. In this talk, I will focus on the flow induced by the steady  injection of hydrosoluble surfactants at a flat air/water interface. This flow has a finite extension that increases with a decrease of the critical micelle concentration of the surfactants. Scaling laws based on the boundary layer theory captures the flow features and allow to predict the flow extension as a function of the physico-chemical properties of the surfactants.

Plus d'information sur cet événement…