ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Alice Pelosse
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 – Jonas Miguet (MSC, Univ. Paris Cité)
Antibubbles : optical interferometry, gas transfers and acoustic signature
An antibubble is a spherical thin film of gas, that encapsulates a droplet, within a liquid medium. The typical size of an antibubble is one centimeter while the thickness of the gas film is of micrometric order. Because of the higher hydrostatic pressure at the bottom, the gas film undergoes a gravitationally-driven drainage from the bottom to the top, that eventually leads to the film rupture and antibubble collapse. I will present recent experiments conducted on antibubbles made in surfactants-containing aqueous solutions. After introducing how one can produce these unusual objects by hand, I will show that the spherical geometry of the system allows for the determination of the thickness profile using only a monochromatic light source and a camera. This technique allowed to show that the thickness evolution in time is strongly affected by mass exchanges with the surrounding bulk ie by gas dissolution/desorption. An “antibubble column” was then designed to measure these fluxes and how the nature of surfactants used may affect them. Finally, I will describe an ongoing work on the acoustic response of an antibubble under exitation. Two resonances are measured with a 4 ms time resolution, I will discuss these results and our first steps to understand them.
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Seminars (8)
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Séminaire PMMH – Pas de séminaire
Vendredi 6 mars de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Pas de séminaire
Vendredi 6 mars de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Christophe Gissinger (LPENS)
Vendredi 13 mars de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Cédric Beaume (U. Leeds)
Vendredi 20 mars de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Philippe Beltrame (U. Avignon)
Vendredi 27 mars de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Gautier Verhille (IRPHÉ)
Vendredi 10 avril de 11h00 à 12h00 - Salle réunion PMMH 1
Formation and fragmentation of fiber aggregate in turbulent flows
Fiber aggregates are commonly encountered in environmental and industrial flows (paper industry, fiber recycling, etc.). However, the physical mechanisms leading to their formation are still misunderstood. Hence, there is still no clear answer to simple questions such as : how long will it take for an aggregate to (…) -
Séminaire PMMH – Nicolas Roméo (James Franck Institute, Chicago)
Vendredi 17 avril de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Pas de séminaire
Vendredi 24 avril 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)
