Journal
POWDER TECHNOLOGY
Volume 203, Issue 3, Pages 510-517Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2010.06.017
Keywords
Granular materials; Rotating cylinders; Axial dispersion; Discrete element method
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Funding
- Engineering and Physical Sciences Research Council (EPSRC)
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The discrete element method is used to calculate axial dispersion coefficients for approximately monosized particles in a rotating horizontal cylinder. Axial dispersion within the cylinder is shown to follow Fick's second law, in that the mean squared deviation of axial position of a pulse of particles is proportional to time. The axial dispersion coefficient is found to depend on the particle size, gravity and drum rotation speed, allowing a dimensionless group to be formed using these four quantities. For sufficiently large cylinders, the axial dispersion coefficient is found to be independent of drum diameter. A general argument is given which suggests that axial dispersion in physical beds of approximately monosized particles should follow Fick's second law. (C) 2010 Elsevier B.V. All rights reserved.
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