Tangential velocity profiles of granular material within horizontal rotating cylinders modelled using the DEM |
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Authors: | J R Third D M Scott S A Scott C R Müller |
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Affiliation: | (4) Department of Neuromotor Physiology, Santa Lucia Foundation, Rome, Italy; |
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Abstract: | Flow regimes of granular materials in horizontal rotating cylinders are industrially important since they have a strong influence
on the rates of heat and mass transfer within these systems. The tangential velocity profile, which describes how the average
particle velocity in the direction parallel to the surface of the bed varies along a radius perpendicular to the surface of
the bed, has been examined for many experimental and simulated systems. This paper is concerned with tangential velocity profiles
within rotating cylinders simulated using the discrete element method. For high fill levels good agreement is found between
the simulated velocity profiles and the equation proposed by Nakagawa et al. (Exp Fluids 16:54–60, 1993) based on magnetic
resonance measurements. At lower fill levels slip is observed between the cylinder wall and the particles in contact with
it and also between the outer layer of particles and the bulk of the bed. It is demonstrated that this slip occurs when the
particles in contact with the wall are able to rotate and that it may be prevented either by using non-spherical particles
or by attaching “lifters” to the cylinder wall. |
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