ÉCOULEMENTS BIDIMENSIONNELS DE MOUSSE AUTOUR D'OBSTACLES

Abstract : This thesis studies the bidimensional flows of foam around obstacles. After a recall of the context in foam rheology research, the experimental setup is presented: the goal is to generate the flow of a foam, constituted by a monolayer of bubbles confined between a soap solution and a glass plate, around an obstacle, and to simultaneously measure the force exerted by the foam on the obstacle, and the various fields describing locally the flow. A systematic study of the drag on various obstacles, and of the dissipation, versus numerous control parameters (flow rate, bubble size, bulk viscosity, monolayer thickness) is then described. The drag has two contributions: a yield one, at vansihing velocity, and a dynamic one, revealing that the foam behaves as a yield stress fluid. Then, the following fields: velocity, stress, deformation, topological rearrangements, are studied. The results strongly constrain the rhelogical models, evidencing an fore-and-aft asymmetry, of elastic origin. The thesis ends by a discussion of all presented results, and with some tracks to theoretically model the descibed phenomena.
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Theses
Dynamique des Fluides [physics.flu-dyn]. Université Joseph-Fourier - Grenoble I, 2005. Français
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Submitted on : Monday, December 11, 2006 - 4:38:37 PM
Last modification on : Tuesday, September 11, 2018 - 11:00:02 AM
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Benjamin Dollet. ÉCOULEMENTS BIDIMENSIONNELS DE MOUSSE AUTOUR D'OBSTACLES. Dynamique des Fluides [physics.flu-dyn]. Université Joseph-Fourier - Grenoble I, 2005. Français. 〈tel-00119699〉

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