Microscopic Origin of Hydrodynamic Diffusion ?

Orateur : Bloen METZGER (IUSTI-CNRS, Aix-Marseille University, France)

Torus formation, destabilization into droplets, then self-similar cascade : the sedimentation of a cloud of particles in a viscous fluid is spectacular. How can such a conceptually simple system develop such a rich phenomenology ? The long range nature of the hydrodynamic interactions between particles and their collective aspect (N-body problem) are the essential ingredients to understand this dynamic. We will discuss in particular the phenomenon called “hydrodynamic diffusion” and will show that, despite a similar phenomenology, its origin is very different in sedimenting and in sheared suspensions.

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