Dynamiques d'imbibition en milieu confiné

Abstract : This experimental thesis deals with imbibition in confined media. This situation occurs when a fluid which preferentially wets the solid displaces another immiscible fluid. The divergence of the viscous stress at the contact line with the solid complicates the description of both the shape and the invasion dynamic of the meniscus that can no longer be described, even at the macroscopic length scale of the solid confinement, by only the displacement of a homogeneous liquid front. The absence of any intrinsic fluids length scale requires to take into account the coupling between the interface shape and the flow at all scales, from nanometers (molecular interaction) to solid confinement scale (hundred micrometers in our experiments). Multi-scale behavior will be the central point of this thesis. Using new microfluidics tools, we first made a quantitative study of imbibitions in Hele-Shaw geometry. We demonstrate a new class of liquid entrainment transition both experimentally and numerically. In addition, an extensive analysis of our numerical model shows that it consistently describes all scenarios that have been reported so far. We then study imbibitions in model porous media. We demonstrate a new invasion process, where the flow occurs along the corner of the porous? obstacles, that generalizes the previous entrainment. We finally propose a geometric criterion that discriminates between the different invasion scenarios.
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Bertrand Levaché. Dynamiques d'imbibition en milieu confiné. Physique Classique [physics.class-ph]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066049⟩. ⟨pastel-00966910v2⟩

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