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Interfaces à grains, et autres situations de mouillage nul

Abstract : Adding an intermediate phase (gaseous or granular) between a drop and a surface prevent the wetting of the liquid. We study experimentally the consequences of the presence of this phase on the movement of liquid drops. In a first part, we focus on situations of non-wetting induced by the presence of a gaseous film between the liquid and the surface. One consequence of this film is to set in motion a Leindenfrost drop on a hot asymmetric (ratchet-like) surface. We found that the asymmetric flow of gas through the vapor film between the droplet and the surface causes the propulsion of the drop by rocket effect. Conversely, the thin film insulation may induce additional viscous dissipation as observed for example in the rebound of a soap bubble on a liquid. The second part of this work is devoted to another situation of non-wetting achieved by adding grains at the surface of a drop (called liquid marble). It then forms a composite interface, both capillary and granular which can be highly dissipative : when the density of grains is low, it behaves like a gaz-liquid interface but when the density of grains on the surface densities approach of jamming, the granular nature of the interface prevails. Then, the friction between the grains determines the shape and dynamics of the liquid marbles. We show that the rheology of these interfaces is similar to that of dense granular flows.
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Submitted on : Friday, January 14, 2011 - 2:49:24 PM
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  • HAL Id : pastel-00555816, version 1

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Guillaume Lagubeau. Interfaces à grains, et autres situations de mouillage nul. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨pastel-00555816⟩

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