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Flows of large numbers of macroscopic particles (sand grains, cereals, ball bearings, etc.) occur in natural phenomena like land slides or avalanches and are an important part of many industrial processes. The flow behavior of granular fluids displays a rich rheology including Newtonian, shear thinning, and shear thickening regimes as well as the famous Bagnold scaling. The non-equilibrium nature of granular flows and the high densities and shear rates involved make a theoretical description challenging. I will begin with a qualitative discussion of what determines the flow behavior. Based on this discussion I will develop a theory from first principles that makes it quantitative and allows the prediction of flow curves and transport coefficients.

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Till Kranz, ITP & DLR
TP seminar room 0.03
Contact: not specified