Ecoulements, imbibition et fragmentation de phase dans les milieux poreux

Abstract : Porous media are ubiquitous in today’s society due to chance or necessity. Some of them allow the transportation of one or several immiscible fluid phases simultaneously. This property is both usual and critical in many industrial processes. The transport of a wetting phase, imbibition, has been widely studied but lots of issues remain opened. In this manuscript, three of them are addressed. Gravity induced phase fragmentation has been studied in an asymmetric pore junction. Fragmentation criterion and dynamic are predicted analytically and confirmed experimentally. Then, the broadening of an imbibition front in a capillary network has been investigated numerically. Results resolved a controversy in the literature. Finally, imbibition in a medium made of flexible sheets has been studied both numerically and experimentally. It showed that sheets flexibility induces their clustering and influences the imbibition dynamic.
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Jean-Baptiste Charpentier. Ecoulements, imbibition et fragmentation de phase dans les milieux poreux. Mécanique des fluides [physics.class-ph]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMLH20⟩. ⟨tel-01944902⟩

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