Seminars
Contact :
Matthieu Labousse
Tel : +33 (0) 1 40 79 45 97
Joshua McGraw
Tel : +33 (0) 1 40 79 59 62
Gulliver seminars take place on Mondays at 11:30 AM in the F304 room, and typically last one hour including questions. The seminars are in English, and the scientific topics are mainly those studied in the laboratory.
Gulliver Seminar, Isabelle Cantat (Institut de Physique de Rennes)
Visco-elasticity of foam films
Liquid foam exhibits surprisingly high viscosity, higher than each of its phases. This dissipation enhancement has been rationalized by invoking either a geometrical confinement of the shear in the liquid phase, or the influence of the interface viscosity. However, a precise localization of the dissipation, and its mechanism at the bubble scale, is still lacking. To this aim, we simultaneously monitored the evolution of the local flow velocity, film thickness and surface tension of a five films assembly, induced by di-erent controlled deformations. These measurements allow us to build local constitutive relations for this foam elementary brick. We first show that, for our millimetric foam films, the main part of the film has a purely elastic, reversible behavior, thus ruling out the interface viscosity to explain the observed dissipation. We then highlight a generic frustration at the menisci, controlling the interface transfer between neighbor films and resulting in the localization of a bulk shear flow close to the menisci. A model accounting for surfactant transport in these small sheared regions is developed. It is in good agreement with the experiment, and demonstrate that most of the dissipation is localized in these domains. The length of these sheared regions, determined by the physico-chemical properties of the solution, sets a transition between a large bubble regime in which the films are mainly stretched and compressed, and a small bubble regime in which they are sheared. Finally, we discuss the parameter range where a model of foam viscosity could be built on the basis of these local results.
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Seminars (4)
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Gulliver Seminar : Martin van Hecke (AMOLF, Univ. Leiden, Chaire Paris Science)
Lundi 30 mai 11:30-12:30 - Bibliothèque PCT - F3.04
Pathways and Information in Complex Matter
Collections of two-state hysteretic elements called hysterons describe the intricate pathways, hysteresis loops and memory effects observed in crumpled sheets and amorphous media. Such hysterons also naturally arise in many mechanical metamaterials and are then associated with buckling and snapping. Here we bridge (...) -
Gulliver Seminar : Arezki Boudaoud (Ecole Polytechnique)
Lundi 13 juin 11:30-12:30 - Bibliothèque PCT - F3.04
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Gulliver Seminar : Julia Yeomans (University of Oxford)
Lundi 20 juin 11:30-12:30 - Bibliothèque PCT - F3.04
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Gulliver Seminar : Thomas Machon (University of Bristol)
Lundi 27 juin 11:30-12:30 - Bibliothèque PCT - F3.04
The audience is often heterogeneous - because of the wide range of scientific topics covered in the lab - so planning a talk for a broader audience would be preferred. The seminar is in English, and speakers are thus invited to prepare their slides in English.
The seminar starts at 11:30 AM. The speaker is asked to arrive in the lab at least 15 minutes in advance to set up their computer. The talks last typically 45 minutes, and are followed by a discussion time.