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Theses

Dynamiques sur des surfaces texturées et imprégnées

Abstract : This thesis aims at characterizing drops, bubbles and thin films dynamics on biomimetic textured surfaces, impregnated with oil (known as LIS in the literature). When an aqueous liquid is deposited on such surfaces, the four phases at stake (oil, air, textures and deposited liquid) generate multiple interfaces, playing a crucial role in the various dynamics observed. The viscous friction opposing the motion of a drop on an inclined LIS at low capillary numbers is studied as a function of the oil/drop viscosity ratio. The results revealed the crucial role of the microscopic oil meniscus surrounding the foot of the drop. Then, two experiments focusing on the dynamics of a receding contact lines are studied: the dewetting of a thin aqueous film and the pearling instability. In both cases, the qualitative behavior is similar to the one reported in the literature on conventional solid surfaces. However, a deeper study reveals that the presence of oil changes quantitatively the dynamics. The flow in both the aqueous and the oil phases must then be taken into account simultaneously. The results obtained in this work highlight the originality of those surfaces, and shed new light on the very peculiar role of the oil meniscus surrounding the contact lines.
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  • HAL Id : tel-02612233, version 1

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Armelle Keiser. Dynamiques sur des surfaces texturées et imprégnées. Dynamique des Fluides [physics.flu-dyn]. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS601⟩. ⟨tel-02612233⟩

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