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DEM simulation of dense granular flows in a vane shear cell: Kinematics and rheological laws
شبیه سازی DEM از جریان های دانه متراکم در یک سلول برشی پره: قوانین Kinematics و رئولوژیکی-2020 The rheology ofdense granular flows is investigatedthrough discrete elementmethod (DEM)simulation of a vane
shear cell. From the simulation, profiles of shear stress, shear rate, and velocity are obtained, which demonstrates
that the flowfeatures in the vane shear cell are equivalent to those in the classic annular Couette cell. A novel correlation
for the apparent viscosity is formulated and leads to a newexpression for μKT in the kinetic theory analysis.
The μKT formulation is able to qualitatively capture the μ-I relation in the shear cell. A correlation length is added in
the energy dissipation termto account for the effects of the particle motion correlation. A simplified correlation
length model is derived based on DEMresults and is compared with the literature. Themodified granular kinetic
energy equation is able to correctly predict the granular temperature profiles in the shear cell. Keywords: Annular Couette cell | Discrete element method (DEM) | Extended kinetic theory | Granular flow | Rheology |
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