Liquid interface and buoyancy stabilization using high-frequency vibrations

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• Dr. Benjamin Apffel (ESPCI)
• Friday 21 October 2022, 12:30-13:30
• LR12.

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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.

This talk is part of the Engineering Fluids Group Seminar series.

This talk is included in these lists:

• Acoustics Lab Seminars
• Engineering Department Acoustics/Combustion Student seminars
• Engineering Fluids Group Seminar
• LR12

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