Segregation of large particles in dense granular flows: A granular Saffman effect?
arXiv:1705.06803 · doi:10.1103/PhysRevFluids.3.074303
Abstract
We report on the scaling between the lift force and the velocity lag experienced by a single particle of different size in a monodisperse dense granular chute flow. The similarity of this scaling to the Saffman lift force in (micro) fluids, suggests an inertial origin for the lift force responsible for segregation of (isolated, large) intruders in dense granular flows. We also observe an anisotropic pressure/stress field surrounding the particle, which potentially lies at the origin of the velocity lag. These findings are relevant for modelling and theoretical predictions of particle-size segregation. At the same time, the suggested interplay between polydispersity and inertial effects in dense granular flows with stress- and strain-gradients, implies striking new parallels between fluids, suspensions and granular flows with wide application perspectives.
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- Modified Archimedes' principle predicts rising and sinking of intruders in sheared granular flows
- A unified description of gravity- and kinematics-induced segregation forces in dense granular flows
- Segregation forces in dense granular flows: Closing the gap from single intruders to mixtures
- Bridging the gap between particle-scale forces and continuum modelling of size segregation: application to bedload transport
- General model for segregation forces in flowing granular mixtures
- Lift force acting on an intruder in dense, granular shear flows
- Dense bidisperse suspensions under non-homogenous shear