Abstract
Small particles fall through sheared beds of larger particles in settings ranging from geophysics to industry, but the study of large-to-small size ratios R, spanning the trapping threshold Rt, has been neglected. In simulations of noncohesive spheres for R<Rt, the small-sphere vertical velocity vp first increases with shear rate γ̇ as trapping time decreases, but vp then decreases as velocity fluctuations frustrate downward mobility. For R>Rt, vp is constant at low γ̇, but again decreases at high γ̇. We model these behaviors and discuss analogies with electron transport in solids. Published by the American Physical Society 2024
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