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
Emilie Dressaire (NYU School of Engineering)
Tuning macroscopic flows using micro-structures
In this talk, I will present experiments devoted to systems in which the presence of micrometer-scale structures has macroscopic, observable effects on the flow.
We will first consider thin liquid films formed when jets impinge on solid surfaces such as hydraulic jumps and water bells. On a smooth surface, the flow is radial and isotropic. The addition of a controlled micro-patterned surface allows tuning of the geometry of the flow into polygonal water structures. We will then discuss the sloshing dynamics, i.e. the formation of waves on the surface of a liquid, due to the sudden motion of a partially filled container. We studied the influence of the addition of foam on top of the liquid and show that foam can be used to damp the waves, through viscous dissipation in the micrometer-scale Plateau borders.
We will then focus on particle-laden flows in microchannels. Microchannels are used as a pore-scale model of porous membranes or filters that allow fluid to pass through but trap contaminants. Once a clog is formed in a pore, incoming particles aggregate upstream, which leads to a dramatic reduction of the flow rate. We use this microfluidic approach to study the clog formation and the growth of the aggregate.
Figure : From left to right : a polygonal hydraulic jump, two layers of bubbles on a sloshing liquid and clogs in parallel micro-channels.
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)
