Abstract
The idea that the forces of a large granular intruder could be decomposed into a modified Archimedean buoyancy force and a segregation lift force has recently been presented. We show how this modified buoyancy force arises from microscale contact behavior and show how to link it to the previous Voronoi based description. Our model is in agreement with the Voronoi model for intermediate size ratios and better approaches the physical limits for large and small size ratios, suggesting it is a more accurate description of the buoyancy force.
Highlights
Granular mixtures that consist of different-sized grains have the ability to segregate when agitated, a complex mechanical process that leads to the spatial separation of grains by their size [1,2,3,4]
In this study we address the lack of physical or micromechanical understanding of the granular buoyancy force on a spherical grain introduced in Ref. [44]
To gain microscale insights into the granular buoyancy force we investigate the structural changes around the intruder when the size ratio increases
Summary
Granular mixtures that consist of different-sized grains have the ability to segregate when agitated, a complex mechanical process that leads to the spatial separation of grains by their size [1,2,3,4]. In dense granular flows [12,13], driven by gravity or externally applied shear, size segregation most commonly consist of larger grains rising against gravity towards the flow’s free-surface whilst smaller grains sink to the bed.
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