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Shear-induced diffusion in cohesive granular flows: effect of enduring clusters
Published online by Cambridge University Press: 08 November 2018
Abstract
We investigate the effect of intergranular cohesive forces on the properties of self-diffusion in dense granular flows. The study is based on a series of simulated plane shear flows at different inertial and cohesion numbers, in which transverse diffusivities are measured. Results evidence an increase in diffusivity by up to two orders of magnitude when introducing cohesion. This strong effect is analysed using the Green–Kubo framework, expressing the diffusivity in terms of instantaneous grain velocity fluctuations and their time correlation. This analysis shows that cohesion, by forming enduring clusters in the flow, enhances the velocity fluctuations and their time persistence, which both contribute to enhancing grain mixing and self-diffusion.
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- © 2018 Cambridge University Press
References
Macaulay and Rognon supplementary movie 1
Shear induced diffusion at high inertial number and without cohesion (I = 0.3 and C=0) . Grains initially at the centre of the shear cell are coloured in red, while other grains are coloured in blue. All grains keep their colour during shear.
Macaulay and Rognon supplementary movie 2
Shear induced diffusion at high inertial number and with cohesion (I = 0.3 and C=25) . Grains initially at the centre of the shear cell are coloured in red, while other grains are coloured in blue. All grains keep their colour during shear.
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