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 - Mónica S. N. Oliveira (Univ. of Strathclyde)
Extension dominated flows at the microscale : from instabilities to optimisation
James Weir Fluids Laboratory, Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow G1 1XJ, United Kingdom
The use of microfluidic devices has found applications in a range of different areas, many of which make use of complex fluids, such as biofluids and polymer solutions that exhibit viscoelastic behaviour. Taking advantage of the sub-millimetre length scales in microfluidic devices, we are able to probe regions in the Weissenberg (Wi) - Reynolds (Re) number space typically unreachable at the macro-scale, i.e. high Wi and low Re. This ability makes these platforms very interesting for studies that require high elasticity numbers (El=Wi/Re). Here, we focus on the use of microfluidic platforms to study flows of viscoelastic fluids with a strong extensional component, such as the cross-slot and contraction flow devices. In particular, we examine elastic driven flow instabilities that develop even under inertialess flow conditions. We discuss the different flow transitions which appear depending on the fluid rheology, the device geometry, Wi and Re. We also look into the optimisation of microfluidic devices for homogeneous extension deformation, with applications in extensional rheology, in which case we typically want to harness these elastic instabilities as much as possible to obtain the ideal flow field.
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)
