Rheology of dense suspensions

International audienceRheology of dense suspensions Adding rigid particles in a fluid is known to change its properties, which might be a strategy to control the behavior of complex fluids. However, despite its long research history and its practical relevance both in industrial applications and in geophysical problems, the mechanics of suspensions in the dense regime remains poorly understood. In this talk, the rheology of dense suspensions close to jamming will be discussed. The investigation of this extreme regime is made possible thanks to the development of a « pressure imposed rheometer » and measurements will be presented for suspensions of rigid spheres and fibers in different non newtonien suspending fluids