ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH- Kristina Davitt (ENS)
Wetting hysteresis and dynamics : interpreting dissipation mechanisms at the contact line
A liquid moving over a solid substrate is an everyday occurrence, and the hysteresis and dynamics of the three-phase contact line have been measured in innumerable experiments over the years. In addition, the ingredients needed to describe the phenomenon are known : in the most basic picture, there is viscous dissipation in the bulk of the liquid meniscus, and a dissipation that occurs at the nanometer scale, in the vicinity of the contact line. The latter is often attributed to thermally activated hopping of the contact line over heterogeneities on the surface, which are also implicated in the observation of contact angle hysteresis. Despite this, a unified description taking all of this into account is lacking and extracting meaningful parameters from experiments remains a challenge. In this talk I will describe our approach to disentangle bulk viscous dissipation and dissipation at the contact line in order to interpret our measurements. We perform experiments on well-characterised surfaces with either nano-scale defects or molecular coatings and attempt to link the observed hysteresis and dynamics to measureable surface properties.
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
