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Rhéologie et écoulement de fluides chargés : application aux réseaux d'assainissement urbains : étude expérimentale et modélisation

Abstract : This experimental work is a contribution to the study of rheological and pipe flow proprieties of complex fluids (yield stress and thixotropic). Bentonite suspensions and mixtures containing bentonite and carboxymethyl cellulose were investigated. The axial velocity distribution was determined using ultrasonic pulsed Doppler velocimetry technique. In the first experimental part of the thesis, rheological and pipe flow measurements were performed for pure bentonite suspensions at different concentrations. A detailed study is presented on the evolution of the friction factors and velocity profiles for different flow regimes. In a second part, suspension of bentonite and mixtures of bentonite / CMC at different mass concentrations of polymer were studied in terms of their rheological and hydrodynamic flow behavior. It was shown that the polymer has viscosifying properties in laminar regime. However, in the turbulent regime, the polymer acts as a friction reducer. The last part of the thesis was devoted to the study of the effect of temperature on the rheological behavior of polymer solutions and mixtures of clay / polymer. The rheological measurements at different temperatures showed a thermodependent character of the different fluids.
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Abdelhakim Benslimane. Rhéologie et écoulement de fluides chargés : application aux réseaux d'assainissement urbains : étude expérimentale et modélisation. Mécanique des fluides [physics.class-ph]. Université de Strasbourg, 2012. Français. ⟨NNT : 2012STRAD036⟩. ⟨tel-00804350⟩

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