Rheology of non-brownian suspensions: The role of inter- particle contact forces (INVITED)

Abstract eng:
Suspensions of non—Brownian particles display a complex rheology that originates in a subtle balance between hydrodynamic interactions and direct forces between particles, together with the so—called shear—induced microstructure. In particular, the influence of the microstructure has been qualitatively evidenced years ago in shear—reversal experiments. At the particle scale, experimental studies pointed the role played by the surface roughness of the particles in promoting direct contact between particles, and recent numerical computations suggest that contact friction between particles could be part of the explanation for the large viscosity of non—Brownian suspensions. We shall present both experimental and numerical results that highlight the links between contact forces, microstructure and rheology.

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