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SUMMARY:Liquid interface and buoyancy stabilization using high-frequency v
 ibrations - Dr. Benjamin Apffel (ESPCI)
DTSTART:20221021T113000Z
DTEND:20221021T123000Z
UID:TALK178505@talks.cam.ac.uk
CONTACT:99736
DESCRIPTION:Under standard experimental conditions\, a liquid layer placed
  above an air layer (e.g. paintingon a ceiling) tends to fall due to gravi
 ty. However\, it has been demonstrated few decades ago thatvertical high-f
 requency vibrations can prevent the liquid’s fall. In a first part of th
 e seminar\, I willdiscuss such phenomenon as well as other unexpected phen
 omena due to high-frequency vibrations influids. In particular\, I will sh
 ow that the vibrations allow inverted buoyancy of small objects at thelowe
 r interface of the liquid. In a second part\, I will discuss the case of n
 on-vertical vibrations. As aresult\, non-horizontal liquid interfaces can 
 be stabilized in so-called «vibro-equilibria». As for thecase of vertica
 l vibrations\, floating objects behave as if gravity was directed orthogon
 ally to the liquid’sinterface. To end-up\, I will show how vibrations an
 d bubbles can be used to deform liquids in arbitrarymanners as well as tra
 nsport phenomena at such interfaces.
LOCATION:LR12
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