Exploring shear-induced segregation in controlled-velocity granular flows

Lu Jing, Julio M. Ottino, Richard M. Lueptow*, Paul B. Umbanhowar

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

Particle segregation in geophysical and industrial granular flows is typically driven by gravity and shear. While gravity-induced segregation is relatively well understood, shear-induced segregation is not. In particular, what controls segregation in the absence of gravity and the interplay between shear- and gravity-driven segregation remain unclear. Here, we explore the shear-induced segregation force on an intruder particle in controlled-velocity granular flows where the shear profile is systematically varied. The shear-induced segregation force is found to be proportional to the shear rate gradient, which effectively pushes the large intruder from lower to higher shear rate regions. A scaling law is developed for the segregation force that is accurate over a wide range of overburden pressures and shear rates, and hence inertial numbers.

Original languageEnglish (US)
DOIs
StatePublished - Jun 7 2021
Event9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021 - Virtual, Online, Argentina
Duration: Jul 5 2021Aug 6 2021

Conference

Conference9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021
Country/TerritoryArgentina
CityVirtual, Online
Period7/5/218/6/21

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

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