Exploring shear-induced segregation in controlled-velocity granular flows

Lu Jing; Julio M. Ottino; Richard M. Lueptow; Paul B. Umbanhowar

doi:10.1051/epjconf/202124903012

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 conference › Paper › peer-review

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 language	English (US)
DOIs	https://doi.org/10.1051/epjconf/202124903012
State	Published - Jun 7 2021
Event	9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021 - Virtual, Online, Argentina Duration: Jul 5 2021 → Aug 6 2021

Conference

Conference	9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021
Country/Territory	Argentina
City	Virtual, Online
Period	7/5/21 → 8/6/21

ASJC Scopus subject areas

Materials Science (miscellaneous)

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10.1051/epjconf/202124903012

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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.",

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AU - Jing, Lu

AU - Ottino, Julio M.

AU - Lueptow, Richard M.

AU - Umbanhowar, Paul B.

PY - 2021/6/7

Y1 - 2021/6/7

N2 - 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.

AB - 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.

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DO - 10.1051/epjconf/202124903012

M3 - Paper

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T2 - 9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021

Y2 - 5 July 2021 through 6 August 2021

ER -

Exploring shear-induced segregation in controlled-velocity granular flows

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