WIT Press

THE EFFECTS OF SURFACE ROUGHNESS ON PARTICLE DISPERSION, MIGRATION, AND SELF-DIFFUSIVITY IN LINEAR AND NONLINEAR SHEAR FLOWS

Price

Free (open access)

Paper DOI

10.2495/CMEM-V4-N4-561-572

Volume

Volume 4 (2016), Issue 4

Pages

11

Page Range

561 - 572

Author(s)

M. DARBEHESHTI, J. STOKAN, U. DAM & M.S. INGBER

Abstract

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.

Keywords

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