Multi-scale simulation of needle-shaped particle breakage under uniaxial compaction

被引:49
作者
Grof, Zdenek
Kohout, Martin
Stepanek, Frantisek
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn, London SW7 2AZ, England
[2] Inst Chem Technol, Dept Chem Engn, CR-16628 Prague, Czech Republic
关键词
DEM; fragmentation; compaction; crushing; mathematical modelling; particle;
D O I
10.1016/j.ces.2006.11.033
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The breakage of needle-shaped particles within a random packed bed subjected to uni-directional compaction has been simulated using the discrete element method (DEM). Elongated particles with a chosen aspect ratio have been created by linking individual spherical discrete elements by rigid bonds, characterized by a given ultimate bending strength. A randomly packed bed of these elongated particles has been formed and gradually compressed between two infinite parallel solid planes. The particle size distribution as function of the compaction ratio has been studied in dependence on the individual particle strength, the initial particle length, and their distribution. The simulations have shown that the fragmentation generally follows the sequential halving kinetics and that the formation of fines is most profound in systems with a distribution of particle strengths, both within and between individual particles. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1418 / 1429
页数:12
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