| Wed November 13th 2013 16:00 ZH286 | Seminar | Extension of a suspended soap film: a two-step process Isabelle Cantat |
Details:Liquid foams are widely used in industry, often for their high effective viscosity, whose local origin is still unclear.We present new results on the extension of a suspended film, in a configuration mimicking the elementary deformation occurring during foam shearing. We evidence a surprising two-step evolution: the film first extends homogeneously, then its extension stops and a new thicker film is extracted from the meniscus. The second step is independent of the nature of the surfactant solution, whereas the initial extension is only observable for "rapid" surfactants. We predict this complex behavior by a model based on Frankel's theory, and on interface rigidification induced by confinement. | ||
