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Déplacement d’un objet à travers un fluide à seuil : couche limite, contrainte seuil et mouillage

Abstract : The behavior (flow, adhesion,...) of a yield stress fluid along a solid surface is a recurrent problem in many industrial processes. The non-Newtonian character of this type of material makes it difficult to apply the concepts established in the case of similar flows of simple liquids. In this thesis, we study this problem experimentally by analyzing the flow generated along a solid plate moving vertically (penetration and withdrawal) through a simple yield stress fluid. We first determine the relationship between the measured force along the object and the rheological properties of the material. We derive a new technique for measuring the yield stress of the material. We describe then the local characteristics of the flow generated during the penetration of the plate. We show that the flow is located around the object in a layer of uniform thickness, while the rest of the fluid is deformed but remains in its solid state. We describe the process by which the boundary layer develops and determine the distribution of solid / liquid zones around the object. Finally, we study the effects of wetting and adhesion on the plate. In particular, we present an experimental approach to evaluate the surface tension of a yield stress fluid
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Submitted on : Wednesday, February 13, 2013 - 5:57:14 PM
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Jalila Boujlel. Déplacement d’un objet à travers un fluide à seuil : couche limite, contrainte seuil et mouillage. Autre. Université Paris-Est, 2012. Français. ⟨NNT : 2012PEST1114⟩. ⟨pastel-00788130⟩



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