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Interfaces en grande déformation : oscillations, impacts, singularités

Abstract : We consider three experiments which deal with interfaces. First, we report gravity oscillations of a liquid column immersed in a bath. We stress some peculiarities of this open system and focus on the sources of dissipation (dominated by the entrance and exit effects). We give an analytical expression for it as a function of the geometry of the flow. Then, we are interested in the way a filter (a grid for example) can stop the liquid phase of an aerosol passing through it. We decompose this problem in three model situations: 1) impact of drop on a solid with small holes; 2) capture of a large drop by a small fibre; 3) for irregular grids, behaviour of a drop on a conical wire. We finally study the impact of a jet of a viscous fluid in a same liquid bath. We measure the radius of curvature of the interface which decreases exponentially with the speed of impact. Above a critical speed, the liquid fractures and air is pulled down in a narrow film, the thickness of which has been measured.
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https://tel.archives-ouvertes.fr/tel-00003275
Contributor : Elise Lorenceau <>
Submitted on : Tuesday, August 26, 2003 - 5:39:06 PM
Last modification on : Tuesday, November 10, 2020 - 9:04:03 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:25:23 PM

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  • HAL Id : tel-00003275, version 1

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Elise Lorenceau. Interfaces en grande déformation : oscillations, impacts, singularités. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00003275⟩

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