(89f) Rayleigh-Taylor Instabilities in Granular Materials Undergoing Chute Flow and Gas Flow

Rayleigh-Taylor instabilities commonly occur in fluids of different densities due to a competition between gravitational and surface tension forces. Recently, these instabilities have been shown to occur in granular particles of different size and density subject to combined gas flow and vibration or more recently inclined or chute flow. Here, we investigate the effects of combined gas flow and chute flow on Rayleigh-Taylor instabilities in grains, focusing on the effects of gas flow rates at different values relative to the minimum fluidization velocities of each particle type. The study is conducted using computational fluid dynamics - discrete element method (CFD-DEM) simulations. The ability to enhance or eliminate the instability are demonstrated at different gas flow rates. Mechanistic insights are drawn.