EPJ Web Conf.
Volume 249, 2021Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Published online||07 June 2021|
Shear-induced diffusion: the role of granular clusters
Particles and Grains laboratory, School of Civil Engineering, The University of Sydney. Building J05, 2006 Sydney Australia.
Published online: 7 June 2021
This paper is concerned with the physical mechanisms controlling shear-induced diffusion in dense granular flows. The starting point is that of the granular random walk occurring in diluted granular flows, which underpins Bagnold’s scaling relating the coefficient of self-diffusion to the grain size and shear rate. By means of DEM simulations of plane shear flows, we measure some deviations from this scaling in dense granular flows with and without contact adhesion. We propose to relate these deviations to the development of correlated motion of grains in these flows, which impacts the magnitude of grain velocity fluctuations and their time persistence.
A video is available at https://doi.org/10.48448/9sd2-hg49
© The Authors, published by EDP Sciences, 2021
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