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Theses

Effets du mouillage en hydrodynamique macroscopique : traînée, impacts et ruissellement

Abstract : The influence of the surface properties on a micro-scale liquid flow near a solid wall has been pointed out in the last years; surface properties means here the liquid-solid affinity, in terms of the wetting angle formed between the liquid and the solid phase when a drop is deposited on the solid surface. In particular superhydrophobic surfaces allowed to reach a huge slip in microfluidic flows. One can wonder if the wetting properties do have any influence in macroscopic hydrodynamic situations. This thesis work aspires to provide some answers to this issue.
In a first part, drag force measurements on immersed solids show that a superhydrophobic coating on the surfaces does not lead to the great expected drag reduction. The second aspect of this work concerns solid-liquid impacts situations, where triple contact lines are created : first, solid spheres falling on a liquid-gas interface, then liquid jet hitting solid impactors, what leads to liquid bells formation. In both cases, a huge coupling between surface properties and macroscopic hydrodynamics has been evidenced and rationalized.
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https://tel.archives-ouvertes.fr/tel-00396584
Contributor : Cyril Duez <>
Submitted on : Thursday, June 18, 2009 - 3:11:38 PM
Last modification on : Thursday, October 15, 2020 - 9:00:04 AM
Long-term archiving on: : Tuesday, June 15, 2010 - 5:41:01 PM

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  • HAL Id : tel-00396584, version 1

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Cyril Duez. Effets du mouillage en hydrodynamique macroscopique : traînée, impacts et ruissellement. Dynamique des Fluides [physics.flu-dyn]. Université Claude Bernard - Lyon I, 2008. Français. ⟨tel-00396584⟩

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