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Open AccessReport10.2172/6861306

On the constitutive relation for frictional flow of granular materials: Topical report

Donald D. Gray,James M. Stiles-1988-03-01
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TL;DRAbstract

The flow of granular materials is an economically important phenomenon which is poorly understood. Granular materials may flow in several regimes: gas-solid two phase flow, rapid flow, or frictional flow. The purpose of this report is to develop a constitutive relation for the frictional flow regime in which the grains slide or roll over one another. Ultimately this relation will be incorporated into a large computer code which will be able to simulate all aspects of the motion of bed material in fluidized bed combustors. 13 refs., 6 figs., 2 tabs.

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The flow of granular materials is an economically important phenomenon which is poorly understood. Granular materials may flow in several regimes: gas-solid two phase flow, rapid flow, or frictional flow. The purpose of this report is to develop a constitutive relation for the frictional flow regime in which the grains slide or roll over one another. Ultimately this relation will be incorporated into a large computer code which will be able to simulate all aspects of the motion of bed material in fluidized bed combustors. 13 refs., 6 figs., 2 tabs.

Keywords

FluidizationFluidized bedGranular materialFlow (mathematics)MechanicsConstitutive equationViscosityGeotechnical engineering

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