Abstract

Flows of granular materials play an important role in industry and in nature. This research focuses on shear flows of particles of the same size and of two different sizes and the energy dissipation associated with these flows. The study was performed using a two dimensional discrete element computer simulation of a bounded, gravity-free Couette flow of particles. The heat dissipation rate per unit area in these flows is presented as a function of position in the flow as well as overall solid fraction. Results compare favorably with kinetic theory results from Jenkins and Richman (1985) for rough disks. The heat dissipation rate is also measured for binary mixtures of particles as a function of position in the flow and solid fraction ratio of small to large particles. These results are presented for diameter ratios of ten, five, and two. Results show that dissipation rates increase significantly with overall solid fraction and local strain rates and granular temperatures.

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