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Title: The amazing bouncing droplet

Description: When a low viscosity oil droplet is laid on the surface of a high viscosity oil liquid, it stays at rest for a moment before coalescing. The coalescence can be delayed and sometimes inhibited by injecting fresh air under the droplet. This happens when the surface of the bath oscillates vertically. In this case, the droplet basically bounces on the interface. We observe that the conditions for bouncing depends on the frequency: more precisely we observe resonance when the eigenfrequency of the droplet is excited. In some conditions, a non axi-symmetric mode is excited, leading to a rotation of the droplet and to a horizontal displacement.

Credits: Denis Terwagne, Stephane Dorbolo, Nicolas Vandewalle, Tristan Gilet


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Contributed By: Tausif Billah

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