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 : Valentin Leroy, MSC, Université de Paris
What can ultrasounds tell us on aeration phenomena
Aeration sounds like a very familiar process. We all have an experience of making bubbles in a liquid. However, despite abundant literature on foaming and fragmentation, there are still open questions on how bubbles are entrained by a flow, sliced by an eddy, or even simply how they pop at a surface. Even determining what is the key characteristic of the liquid that will matter is not that obvious. Of course, interfaces will play a role. Does it mean that everything is dictated by surface tension ?
In this talk, we will show that ultrasounds can be a good tool for investigating the aeration of liquids : they allow us to get real-time information on the bubble population in a turbulent flow. We will present experimental results on the particular case of lubricating oils. When a gear rotates in a bath of oil, it entrains bubbles. The level of aeration depends on the speed of rotation, but it is also very sensitive to the formulation of the oil. We will show how oils with different additives lead to different levels of aeration, and how the results correlate with physico-chemical measurements.
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)
