期刊
PARTICUOLOGY
卷 39, 期 -, 页码 1-11出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2017.08.004
关键词
Tetrahedron; Non-spherical particle; Mixing; Drum; Flow regime; Discrete element method
资金
- National Natural Science Foundation of China [51406100, 51576211]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51321002]
- National High Technology Research and Development Program of China (863) [2014AA052701]
- Foundation for the Author of National Excellent Doctoral Dissertation of P.R. China (FANEDD) [201438]
A regular tetrahedron is the simplest three-dimensional structure and has the largest non-sphericity. Mixing of tetrahedral particles in a thin drum mixer was studied by the soft-sphere-imbedded pseudo hard particle model and compared with that of spherical particles. The two particle types were simulated with different rotation speeds and drum filling levels. The Lacey mixing index and Shannon information entropy were used to explore the effects of sphericity on the mixing and motion of particles. Moreover, the probability density functions and mean values and variances of motion velocities, including translational and rotational, were computed to quantify the differences between the motion features of tetrahedra and spheres. We found that the flow regime depended on the particle shape in addition to the rotation speed and filling level of the drum. The mixing of tetrahedral particles was better than that of spherical particles in the rolling and cascading regimes at a high filling level, whereas it may be poorer when the filling level was low. The Shannon information entropy is better than the Lacey mixing index to evaluate mixing because it can reflect the real change of flow regime from the cataracting to the centrifugal regime, whereas the mixing index cannot. (C) 2017 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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