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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Recent seminars (2)
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Séminaire PMMH - Carlos Málaga Iguiñiz (UNAM, Mexico)
Vendredi 5 juin de 11h00 à 12h00 - Salle réunion PMMH 1
The Lattice Boltzmann Method
The lattice-Boltzmann method is a relatively new numerical scheme for fluid dynamics simulations. It is a non-conventional method in the sense that it is not built around the equations of fluid motion. Instead, it computes solutions to the Navier-Stokes equations indirectly based on the Boltzmann equation that (…) -
Séminaire PMMH - Vladimir Gligorov (LPNHE, IN2P3))
Vendredi 22 mai de 11h00 à 12h00 - Salle réunion PMMH 1
The conception and performance of real-time analysis @ the LHCb experiment
The real-time processing of data created by the Large Hadron Collider's (LHC) experiments, amounting to over 10% of worldwide internet traffic, is one of the greatest computing challenges ever attempted. I will discuss the concrete real-time processing challenges faced by one of the LHC's main experiments, LHCb, (…)
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)
