Gouttes, films et jets : quand les écoulements modèlent les interfaces

Abstract : Liquid interfaces may undergo important deformations when subjected to flows. In the first part, we study the shapes of water drops falling into air. In particular, we describe the disintegration mechanism of the largest globules and propose a law for the evolution of this shape. We then focus on the dynamics of fluid films in viscous environments. The lifetime of the antibubbles is determined by the drainage of film of air under the influence of gravity. The bursting of films of soapy water or air immersed in a very viscous environment is strongly affected. We propose a model describing the hole opening in such films. During the bursting process, the fluid in the film is collected in a rim which, owing to its cylindrical geometry and to the flows which it undergoes, is destabilized. Lastly, we tackle the problem of air entrainment by the impact of a liquid jet on a bath of the same liquid. We show that the entrainment threshold is shifted by the widening out and the deceleration of the jet right before its impact.

The first appendix is a simple experimental approach of the propulsion mechanism of the pop-pop boat. The second aims at understanding the behavior of the dynamic receding contact angle in the vicinity of the entrainment transition.
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Contributor : Etienne Reyssat <>
Submitted on : Monday, September 3, 2007 - 6:13:18 PM
Last modification on : Sunday, March 31, 2019 - 1:23:21 AM
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Etienne Reyssat. Gouttes, films et jets : quand les écoulements modèlent les interfaces. Dynamique des Fluides [physics.flu-dyn]. Université Paris-Diderot - Paris VII, 2007. Français. ⟨tel-00169432⟩

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