Pattern Formation and Time-Dependence in Flowing Sand

by R. P. Behringer, Duke Univ, Durham, United States,
G. W. Baxter, Duke Univ, Durham, United States,

Document Type: Proceeding Paper

Part of: Engineering Mechanics


The authors present results for a number of experiments on flowing granular materials and a novel cellular automata model for the flow of these materials when the grains are long and thin. In the first experiment, they present results for the time-dependent stress associated with sand flow in a hopper. In a second set of experiments they show the existence of propagating fronts. These results imply that an additional degree of freedom, not included in conventional models, may be necessary, to describe the experiments. The authors describe experimental observations for the flow of materials with long thin grains; these experiments form the basis for the cellular automata model.

Subject Headings: Time dependence | Sandy soils | Automation | Grain (material) | Flow measurement | Fluid flow | Soil stress | X rays

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