Signatures of shear thinning-thickening transition in dense athermal shear flows

Abstract

In non-equilibrium molecular dynamics simulations of dense athermal shear flows, we observe the transition from shear thinning to shear thickening at a crossover shear rate ${\dot{\gamma }}_c$. Shear thickening occurs when $\frac{\mathrm{d}(\ln T_g)}{\mathrm{d}(\ln \dot{\gamma })}>2$ with $T_g$ the granular temperature. At the transition, the pair distribution function shows the strongest anisotropy. Meanwhile, the dynamics undergo apparent changes, signified by distinct scaling behaviors of the mean squared displacement and relaxation time on both sides of ${\dot{\gamma }}_c$. These features serve as robust signatures of the shear thinning-thickening transition.

arXiv comment5 pages, 3 figures

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• Shear thickening in concentrated suspensions: phenomenology, mechanisms, and relations to jamming
• Jamming of packings of frictionless particles with and without shear