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The flow generated by oblique impingement of granular material on an inclined plane

Johnson, CG; Gray, JM (Manchester)
Thursday 08 January 2009, 12:00-12:15

Seminar Room 1, Newton Institute


We consider a steady stream of granular material impinging on, and subsequently flowing down, an inclined plane. The flow exhibits a wide range of behaviours, depending on the slope angle and a non-dimensionalised fall velocity, ranging from kinetic gas-like flow to intermittant avalanche formation. As well as being of theoretical interest, the scenario is representative of many industrial granular flows. We study in detail a previously unreported steady state flow regime, which displays a teardrop-shaped hydrodynamic shock surrounding the area of impingement. We construct a depth-integrated hyperbolic flow model which predicts with good agreement the experimental location and shape of the shock. A number of the experimentally observed features cannot be predicted by current shallow-layer models of granular materials, and we discuss these with reference to the constitutive rheology of thin-layer granular flows.


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