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Collisions de gouttes asymétriques

Abstract : In this experimental thesis, we are interested in droplets collisions involving asymmetric interfaces. We consider either two droplets made of different liquids or droplets of different sizes, coated (or not) by a monolayer of hydrophobic particles.In a first part, collisions of droplets made of immiscible liquids are studied. The asymmetry of such systems relies on the contrast of the two liquids properties : surface tension, viscosity and density. The outcome of those collisions is a full encapsulation of one liquid by the other one which can be followed by a fragmentation. We pay attention to describe the observed regimes and to establish a scaling law to predict the fragmentation limits of the resulting object. The second part is dedicated to interfaces covered by hydrophobic particles. For those systems, the asymmetry is due to both the interaction of a covered interface with a non covered one and to the size contrast between the objects studied. Studying the propagation of capillary waves, we first characterize the mechanical properties of such interfaces : effective surface tension and modulus of curvature. Further on, we probe, using different impacts configurations, the robustness of those covered objects with the aim of estimating the ability of the particles monolayer to prevent coalescence
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Submitted on : Saturday, December 3, 2011 - 9:12:33 AM
Last modification on : Wednesday, February 26, 2020 - 7:06:03 PM
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  • HAL Id : tel-00647892, version 1



Carole Planchette. Collisions de gouttes asymétriques. Autre. Université Paris-Est, 2011. Français. ⟨NNT : 2011PEST1110⟩. ⟨tel-00647892⟩



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