Instability in Granular Chute Flows

by Brian E. Sanders, Clarkson Univ, Potsdam, NY, USA,
Norbert L. Ackermann, Clarkson Univ, Potsdam, NY, USA,



Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond

Abstract:

Numerical simulations showed that granular flows in a vertical chute can flow as a steady, uniform stream or as an intermittent slug flow. In numerical experiments slugs or grouping of the flowing solids was found to be enhanced with decreases in the coefficient of restitution of the granular particles and with decreases in the bulk number density or concentration of the solids. A statistical parameter was developed to describe the degree of uniformity of the flow along the chute. When tested over a wide range of solid concentrations this parameter was found to have an approximately constant value at a well defined transition point when the flow changed from a uniform to a slug-like flow.

Subject Headings: Granular materials | Flow patterns | Stream channels | Numerical models | Solids flow | Parameters (statistics) | Wells (water)

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