Investigating surprising phenomena at a liquid interface
| When |
Oct 08, 2024
from 11:00 to 12:00 |
|---|---|
| Where | Salle des thèses |
| Attendees |
Benjamin Apffel |
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During this seminar, I will present several surprising phenomena that can occur at a liquid
interface under suitable experimental conditions. In a first part, I will show how high frequency vertical
vibrations can be used to stabilize a liquid layer above an air cushion. Buoyant objects can moreover
float at the lower interface in a way that will be discussed. Some generalization with non-vertical or
spatially inhomogeneous shaking will also be considered. In a second part, I will show how an object
performing circular trajectories can be brought closer from its rotation center when the rotation speed
increases. Such effect occurs when one stirs the water surface with a small floating ball attached to a
deformable string. The combination of the string’s deformation and fluid’s action leads to a wide
variety of ball’s trajectories that will be described. In particular, I will discuss the existence of robust
self-trapped states, in which the ball traps itself at the rotation center.