Issue 17, 2022

Self-diffusion of spherocylindrical particles flowing under non-uniform shear rate

Abstract

This work is devoted to study numerically the self-diffusion of spherocylindrical particles flowing down an inclined plane, using the discrete element method (DEM). This system is challenging due to particles being non-spherical and because they are subjected to a non-uniform shear rate. We performed simulations for several aspect ratios and inclination angles, tracking individual particle trajectories. Using the simulation data, we computed the diffusion coefficients D, and a coarse-graining methodology allowed accessing the shear rate spatial profiles [small gamma, Greek, dot above](z). This data enabled us to identify the spatial regions where the diffusivity strongly correlates with the local shear rate. Introducing an effective particle size d, we proposed a well-rationalized scaling law between D and [small gamma, Greek, dot above]. Our findings also identified specific locations where the diffusivity does not correlate with the shear rate. This observation corresponds to zones where [small gamma, Greek, dot above] has non-linear spatial variation, and the velocity probability density distributions exhibit asymmetric shapes.

Graphical abstract: Self-diffusion of spherocylindrical particles flowing under non-uniform shear rate

Supplementary files

Article information

Article type
Paper
Submitted
06 Oct 2021
Accepted
04 Apr 2022
First published
07 Apr 2022

Soft Matter, 2022,18, 3335-3341

Self-diffusion of spherocylindrical particles flowing under non-uniform shear rate

D. Hernández-Delfin, T. Weinhart and R. C. Hidalgo, Soft Matter, 2022, 18, 3335 DOI: 10.1039/D1SM01436F

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