Abstract: Using the discrete element method, the breaking process of central collision in horizontal direction between two spherical particles was simulated based on Hertz -Mindlin contact model. The effect of relative velocity and different diameter ratios of 1.2, 1.4 and 1.6 on particles breaking behavior were studied. The results show that at low impact velocity, the entire particles are not broken, but their interior bondings begin to fracture, which cause crack at the macro level. With the impact velocity increasing, the particles begin to fracture or be broken completely. When two particles with distinct diameter ratios impact each other, the smaller particle is broken more seriously than the larger one. When the diameter ratio is 1.6, the smaller one acquires the greatest momentum， the momentum with the diameter ratio of 1.4 takes the second place, and the momentum with the diameter ratio of 1.2 is the least.

Keywords： particle impact; breakage; discrete element method; numerical simulation

中图分类号：TQ127.2         文献标志码：A

文章编号：1008-5548(2014)03-0060-04

DOI:10.13732/j.issn.1008-5548.2014.03.014

收稿日期：2013-09-10， 修回日期：2013-11-18，在线出版时间：2014-06-24。

第一作者简介：黄令军（1987—），男，硕士研究生，研究方向为化工过程机械、粉体工程及技术应用。 E-mail:huang_lj90@126.com。

通信作者简介：刘雪东（1965—），男，教授，研究方向为化工过程机械及粉体工程技术。 E-mail:lxd99@126.com。