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 – Romain Mari (LiPhy, Grenoble)
Complex fluids under shear rotation
When thinking about non-Newtonian fluids, phenomena that come to mind
are dependence of the viscosity on shear rate (shear thinning or
thickening) or effects related to anisotropic normal stresses, like the
Weissenberg (or "rod climbing") effect. Thanks to a two-dimensional
parallel plate rheometer where relative plate motion is possible in any
direction parallel to the gap, we show that under varying flow
directions (that we dub shear rotations), complex fluids routinely
exhibit shear forces misaligned with the flow direction. We measure
these forces on a few complex fluids : a simple non-Brownian suspension
of hard spheres, which otherwise has a viscosity which is independent of
the flow rate (a quasi-Newtonian fluid), a microgel suspension
(Carbopol), which is a simple yield stress fluid, and a mayonnaise. The
physical origin of forces orthogonal to the flow direction depends on
the system. For the hard sphere suspension, an interplay between contact
and hydrodynamic forces is at work, whereas for yield stress fluids, the
effects comes from the disorder in the local yield stress at the
microscopic scale.
- Seminar archive
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- Seminars
Seminars (5)
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Séminaire PMMH – Christina Kurzthaler (MPI Dresden)
Vendredi 7 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
Microbes in motion : from surface interactions to porous media
Swimming microorganisms represent fascinating exemplars of non-equilibrium systems and display a range of unusual physical phenomena. These active agents often operate in complex environments, characterized by confining boundaries and flows, that can strongly modify their swimming dynamics. In this talk, I will (…) -
Séminaire PMMH – Christiana Mavroyiakoumou (Oxford University)
Vendredi 21 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Paddy Royall (Gulliver, ESPCI Paris)
Vendredi 28 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Francesca Borghi (U. Milan)
Vendredi 5 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Cécile Callou (Muséum d'Histoire naturelle)
Vendredi 9 janvier 2026 de 11h00 à 12h00 - Salle réunion PMMH 1
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)
