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- W3168907256 abstract "A depth-weakening wall friction coefficient, µ w , has been reported from three-dimensional numerical simulations of steady and transient dense granular flows. To understand the degradation mechanisms, a scaling law for µ w / f and χ has been proposed where f is the intrinsic particle-wall friction and χ is the ratio of slip velocity to square root of granular temperature (Artoni & Richard, Phys. Rev. Lett. , vol. 115 (15), 2015, 158001). Independently, a friction degradation model has been derived which describes a monotonically diminishing friction depends on a ratio of grain angular and slip velocities, Ω (Yang & Huang, Granular Matter , vol. 18 (4), 2016, 77). In search of experimental evidence for how these two parameters degrade the µ w , an annular shear cell experiment was performed to estimate the bulk granular temperature, angular and slip velocities at sidewall through image-processing. Meanwhile, µ w was measured by a force sensor to confirm the weakening towards the creep zone. The measured µ w / f − χ and µ w / f − Ω were both well-fitted to the corresponding models showing that both granular temperature and angular velocity are significant mechanisms to degrade the µ w which broadens the research perspective on modeling the boundary condition of dense granular flows." @default.
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- W3168907256 date "2021-01-01" @default.
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- W3168907256 title "Influence of granular temperature and grain rotation on the wall friction coefficient in confined shear granular flows" @default.
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