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Theses

Nappes, trous, ligaments et gouttes

Abstract : This thesis tackles the problem of liquid films atomization through various experimental configurations dealing with their formation, destabilization and fragmentation. In a first part, two mechanisms of receding soap film disintegration are identified and described. When the film is released from a border, the acceleration sustained by the Plateau border explains the destabilization. When puncture occurs in the center, the film flapping is promoted by the interaction with the surrounding atmosphere which leads to its fragmentation. In a second study, the singular folding of liquid bells is explained by an original free surfaces hydraulic jump insuring transition from a subcritical to a supercritical flow with respect to capillary waves. The strong curvatures associated with this transition, also implying strong centripetal acceleration of the flowing liquid, may induce the downstream sheet destabilization. The question of marine aerosols formation via surface bubble bursting is investigated in a third part. Bubbles geometry, their film drainage mechanism and puncture events are studied in order to account for the film thickness at the onset of bursting. The subsequent bursting dynamics is detailed to characterize the spray production. In a last part, effervescent atomization is studied on a model experimental set up: a flat liquid sheet seeded with small air bubbles acting as heterogeneous hole nuclei. On the basis of holes nucleation and growth measurements, a statistical model of the liquid ligament red resulting from the holes rims combination offers a description of the spray generated by the red fragmentation.
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https://tel.archives-ouvertes.fr/tel-00600229
Contributor : Henri Lhuissier <>
Submitted on : Tuesday, June 14, 2011 - 12:07:59 PM
Last modification on : Tuesday, October 20, 2020 - 3:10:34 AM

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  • HAL Id : tel-00600229, version 1

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Henri Lhuissier. Nappes, trous, ligaments et gouttes. Dynamique des Fluides [physics.flu-dyn]. Université de Provence - Aix-Marseille I, 2011. Français. ⟨tel-00600229⟩

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