Tuesday, July 9, 2013

1307.2133 (Claus Heussinger)

Shear thickening in granular suspensions: inter-particle friction and
dynamically correlated clusters

Claus Heussinger
We consider the shear rheology of concentrated suspensions of non-Brownian frictional particles. The key result of our study is the emergence of a pronounced shear-thickening regime, where frictionless particles would normally undergo shear-thinning. We clarify that shear thickening in our simulations is due to enhanced energy dissipation via frictional inter-particle forces. Moreover, we evidence the formation of dynamically correlated particle-clusters of size $\xi$, which contribute to shear thickening via an increase in \emph{viscous} dissipation. A scaling argument gives $\eta\sim \xi^2$, which is in very good agreement with the data.
View original: http://arxiv.org/abs/1307.2133

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