The Effects of Surface Roughness on Particle Dispersion, Migration, and Self-Diffusivity in Linear and Nonlinear Shear Flows

The Effects of Surface Roughness on Particle Dispersion, Migration, and Self-Diffusivity in Linear and Nonlinear Shear Flows

M. Darbeheshti J. Stokan U. Dam M.S. Ingber

Department of Mechanical Engineering, University of Colorado Denver, Denver, CO, USA

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Particle interactions in highly-viscous nonlinear and linear shear flows play an important role in a variety of applications including composite materials processing, microfluidics, chromatography, and particle resuspension, to name a few. Binary interactions among particles can provide information used in rheological models for suspension flows such as migration rates and self-diffusivity. In past numerical studies, particle roughness has been treated, for the most part, as a constant, static quantity. In the current study, roughness is treated as a stochastic parameter. Hence, quantities such as dispersion, net particle migration, and self-diffusivity also become stochastic parameters. Numerical simulations are performed using a semi-analytic solution for the motion of two particles in an arbitrary unbounded flow field to determine the effects of random particle roughness.


particle dispersion, particle interactions, particle migration, self-diffusivity, suspension flows


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