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Granular particles subject to both vertical gas flow and vertical vibration are shown experimentally to exhibit structured convection cells in a densely packed yet fluidized state without gas voids traveling… Click to show full abstract
Granular particles subject to both vertical gas flow and vertical vibration are shown experimentally to exhibit structured convection cells in a densely packed yet fluidized state without gas voids traveling through the particles. Continuum gas-granular simulations reproduce the phenomenon and demonstrate that the convection occurs due to buoyant force arising from a positive vertical gradient in bulk solid density competing with viscous force created by interparticle friction. Simulations further show that convection structures persist in a controllable manner when increasing system width.
Journal Title: Soft matter
Year Published: 2022
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