Rhéophysique des suspensions granulaires vibrées

Abstract : Quantify the impact of vibrations on the rheological properties of granular suspensions is of paramount importance in many environmental or industrial areas. For example, the soil liquefaction mechanisms, as a result of an earthquake, remain poorly understood by now. The purpose of this thesis is to provide a fundamental understanding of the modifications induced by the vibrations on physical and mechanical properties of a model concentrated suspension (PHI~~0.61), made up of spherical monodisperse glass beads immersed in a Newtonian fluid. In a first step, the macroscopic rheological behavior of this system has been studied using a classical rheometer coupled with a vibrating cell. The vibrations induce the vanishing of the yield stress of the material and the emergence of a Newtonian plateau at low shear. Thus, it has been shown that the viscosity of the suspension is controlled by a competition between lubrication and frictional stresses. Another type of experiment, the falling ball rheometry by Magnetic Resonance Imaging, shows similar results. In a second step, the local dynamics of the grains was probed by diffusing wave spectroscopy using a CCD camera based on the analysis of the intensity fluctuations of speckle patterns. This technique allowed to probe the dynamics of particles at long times. It appears that the characteristic relaxation time obtained is related to the suspension viscosity, thereby linking the macroscopic rheological properties to the diffusional dynamics at the grain scale
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Caroline Hanotin. Rhéophysique des suspensions granulaires vibrées. Autre [cond-mat.other]. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0150⟩. ⟨tel-01751185⟩

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