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Viscoélasticité et écoulements de fluides structurés

Abstract : Under this thesis, we look at the different behaviors of structured fluids (aqueous solutions of polymers, suspensions) under sheared flow. In the first part, we give a comprehensive description of the items constituting the material using a structural modeling, on the one hand and carrying out birefringence measures to qualify anisotropy objects on the other. Through the tentio-law, we show that the behavior of objects depends only on the applied stress. In addition, we study the conditions of objective measures to conduct a rigorous characterization, comparing creep and oscillations measures, and using an analytical approach. This will help develop a method for identifying viscoelastic parameters and their developments under shear, in both a linear and a no linear regime. The second part concerns the two-dimensional flows of fluids in a coaxial cylinder geometry centered and eccentred, in a wide gap. The objective is to study the local behavior of different fluids using the PIV technic. To do this, we realize an experimental reliable and accurate enough, in all the gap. The experimental device is validated by measurements on a Newtonian fluid. The measures allow to access the local law behavior of each material that we compare with the overall behavior of law given by the rheometer in the case of centered geometry . In addition, digital simulations on Fluent, were made to complement our study. The results for laminar flow, for different fluids: newtonian, little rhéofluidifiant and very rhéofluidifiant, show that it is possible to describe and predict the behavior of some fluid but the existing model in Fluent can not describe the behavior of very rheofluidifiant fluids which have a very strong heterogeneity gradients speed in the gap
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Submitted on : Thursday, March 29, 2018 - 11:52:43 AM
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Ghania Benbelkacem Benbelkacem-Benmouffok. Viscoélasticité et écoulements de fluides structurés. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL012N⟩. ⟨tel-01748911⟩



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