PMID: 23944455Aug 16, 2013

Slow axial drift in three-dimensional granular tumbler flow

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Zafir ZamanRichard M Lueptow

Abstract

Models of monodisperse particle flow in partially filled three-dimensional tumblers often assume that flow along the axis of rotation is negligible. We test this assumption, for spherical and double cone tumblers, using experiments and discrete element method simulations. Cross sections through the particle bed of a spherical tumbler show that, after a few rotations, a colored band of particles initially perpendicular to the axis of rotation deforms: particles near the surface drift toward the pole, while particles deeper in the flowing layer drift toward the equator. Tracking of mm-sized surface particles in tumblers with diameters of 8-14 cm shows particle axial displacements of one to two particle diameters, corresponding to axial drift that is 1-3% of the tumbler diameter, per pass through the flowing layer. The surface axial drift in both double cone and spherical tumblers is zero at the equator, increases moving away from the equator, and then decreases near the poles. Comparing results for the two tumbler geometries shows that wall slope causes axial drift, while drift speed increases with equatorial diameter. The dependence of axial drift on axial position for each tumbler geometry is similar when both are normalized by...Continue Reading

References

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Citations

Mar 20, 2018·Physical Review. E·Nathalie Thomas, Umberto D'Ortona
Mar 18, 2016·Physical Review. E·Umberto D'OrtonaRichard M Lueptow
Jan 20, 2018·Physical Review. E·Lachlan D SmithRichard M Lueptow
Jun 17, 2018·Physical Review. E·Umberto D'OrtonaRichard M Lueptow
Mar 19, 2019·Annual Review of Chemical and Biomolecular Engineering·Paul UmbanhowarJulio M Ottino
Apr 15, 2016·Physical Review. E·Tilo FingerRalf Stannarius
Jan 15, 2016·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Umberto D'OrtonaRichard M Lueptow

Related Concepts

Axial
Surface
Spherophakia
Spherical Shape
Three-dimensional
Particle
Simulation
Research Study
Granular Insula
Cone-Rod Dystrophies

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