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Theory for the rheology of dense non-Brownian suspensions: divergence of viscosities and
$\unicode[STIX]{x1D707}$–
$J$ rheology
Published online by Cambridge University Press: 14 February 2019
Abstract
A systematic microscopic theory for the rheology of dense non-Brownian suspensions characterized by the volume fraction $\unicode[STIX]{x1D711}$ is developed. The theory successfully derives the critical behaviour in the vicinity of the jamming point (volume fraction
$\unicode[STIX]{x1D711}_{J}$), for both the pressure
$P$ and the shear stress
$\unicode[STIX]{x1D70E}_{xy}$, i.e.
$P\sim \unicode[STIX]{x1D70E}_{xy}\sim \dot{\unicode[STIX]{x1D6FE}}\unicode[STIX]{x1D702}_{0}\unicode[STIX]{x1D6FF}\unicode[STIX]{x1D711}^{-2}$, where
$\dot{\unicode[STIX]{x1D6FE}}$ is the shear rate,
$\unicode[STIX]{x1D702}_{0}$ is the shear viscosity of the solvent and
$\unicode[STIX]{x1D6FF}\unicode[STIX]{x1D711}=\unicode[STIX]{x1D711}_{J}-\unicode[STIX]{x1D711}>0$ is the distance from the jamming point. It also successfully describes the behaviour of the stress ratio
$\unicode[STIX]{x1D707}=\unicode[STIX]{x1D70E}_{xy}/P$ with respect to the viscous number
$J=\dot{\unicode[STIX]{x1D6FE}}\unicode[STIX]{x1D702}_{0}/P$.
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- © 2019 Cambridge University Press
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