A Rayleigh-Bénard convection instability analog in vibrated gas-fluidized granular particles.
basic_science · Level V
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- Record sourced from PubMed, PMID 35466965.
- Also identified by DOI 10.1039/d1sm01803e.
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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.