Rheology of dense Newtonian and viscoplastic suspensions

Abstract eng:
Despite its long research history and its practical relevance, the mechanics of dense suspensions remain poorly understood. A frictional approach, which stems from the rheology of dry granular materials, has been successfully applied to Newtonian suspensions using an original pressure-imposed shear cell. This alternative way of looking at suspensions provides a way to circumvent the divergence observed in volume-imposed rheometry and yields examination of the rheology close to the jamming transition. This has been also applied to suspensions of non-Brownian spheres in yield-stress fluids. Accurate measurements of the shear stress and particle normal stress are favorably compared with a model based on scaling arguments and homogenization method.

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