Abstract

Under standard experimental conditions, a liquid layer placed above an air layer (e.g. paintingon a ceiling) tends to fall due to gravity. However, it has been demonstrated few decades ago thatvertical high-frequency vibrations can prevent the liquid’s fall. In a first part of the seminar, I willdiscuss such phenomenon as well as other unexpected phenomena due to high-frequency vibrations influids. In particular, I will show that the vibrations allow inverted buoyancy of small objects at thelower interface of the liquid. In a second part, I will discuss the case of non-vertical vibrations. As aresult, non-horizontal liquid interfaces can be stabilized in so-called «vibro-equilibria». As for thecase of vertical vibrations, floating objects behave as if gravity was directed orthogonally to the liquid’sinterface. To end-up, I will show how vibrations and bubbles can be used to deform liquids in arbitrarymanners as well as transport phenomena at such interfaces.