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Superposition d’écoulements orthogonaux dans des fluides complexes : mise en place de l’expérience, application aux suspensions et aux fluides à seuil

Abstract : The scalar relation between stress and strain obtained by simple shear within classical rheometers is not rich enough to describe complex flows. To obtain more information, we shall superimpose two orthogonal flows and for that, we shall use the parallel-plate geometry. The volume of fluid has a cylindrical shape and can be sheared by the rotation of a plate or squeezed by the move closer (or stretched by the move away) of the plates. We detail theoretical considerations that allow us to determine the link between stresses and shear rates and associated macroscopic efforts and velocities. Then we precisely describe the experimental setup developed to impose all kind of flows : steady or oscillating flows, rotation or squeeze. After that, we present the results of comparison between rotational and squeeze flow. Finally, we present the experiments with both superimposed flows. We create complex flows to measure and understand, among others, 3D behavior and 3D flow criteria of yield stress fluids
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https://pastel.archives-ouvertes.fr/pastel-00657329
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Submitted on : Friday, January 6, 2012 - 1:12:24 PM
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  • HAL Id : pastel-00657329, version 1

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Quentin Barral. Superposition d’écoulements orthogonaux dans des fluides complexes : mise en place de l’expérience, application aux suspensions et aux fluides à seuil. Autre. Université Paris-Est, 2011. Français. ⟨NNT : 2011PEST1065⟩. ⟨pastel-00657329⟩

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