Opening and retraction of particulate soap films
1 Université Paris-Est, Laboratoire Navier (UMR CNRS 8205, École des Ponts ParisTech, IFSTTAR) 2, allée Kepler, 77420 Champs-Sur-Marne, France
2 Université Paris-Est, Laboratoire Navier (UMR CNRS 8205, École des Ponts ParisTech, IFSTTAR) 5 Bd Descartes, 77454 Champs-Sur-Marne, France
Received: 14 April 2015
Accepted: 10 July 2015
We study for the first time the bursting dynamics of thin liquid films laden with hydrophobic micronic particles either with free or constrained edges. We highlight that the particles can arrange in bilayer or monolayer configurations and explore a range of particles coverage from zero to random close packing. When the particles bridge the two interfaces (monolayer configuration) of free-edge films, the hole opens intermittently. For the other cases, we observe constant retraction velocities, modeled by balancing liquid and particles inertia against surface tension as in Taylor-Culick theory. But, this approach is only valid up to a critical value of particles coverage due to the interplay between the interfaces and the friction between particles.
PACS: 68.15.+e – Liquid thin films / 47.55.nb – Capillary and thermocapillary flows / 47.57.Gc – Granular flow
© EPLA, 2015