Séminaire

Mardi 12 Mars 2019 à 11h00.

Coupling between adjacent soap films by interface transfer

''The highly-confined flow of the liquid phase, trapped between the gas bubbles, is at the origin of the large effective viscosity of the liquid foams. Despite the industrial relevance of this complex fluid, the foam viscosity remains difficult to predict, because of the lack of flow characterization at the bubble scale. In particular, the transfer of interface from one film to its first neighbour through a meniscus during a film deformation, a key parameter for the current predictions of foam dissipation, has never been measured. In this seminar, we will present our experimental results on this interface transfer obtained using a dedicated deformable frame and synchronous thickness and velocity field measurements. Moreover, we will show how this transfer can induce an intense swelling of the neighbour films, which may play an important role in the thickness distribution in 3D foams and in their apparent viscosity.''