Abstract： The experiment of measuring the particle porosity, falling-bouncing behavior and the angle of repose was carried out for the verification of the reliability of DEM method and the accuracy of HertzMindlin contact model, especially the parameter values used in the model. The results show that the porosity of free-falling glass particles decreases with the particle numbers at the beginning, then remains unchanged for the influence of particle gravity action and close packing. The simulated bouncing behavior of free-falling glass particles agrees with the experiment results exactly. The repose angle of the glass particles decreases with the particle diameter, which also keeps consistent with the experiment results quantitatively. The number of particles should be large enough to ensure the accuracy of the angle of repose. The accuracy of Hertz-Mindlin contact model is validated, DEM method is found to be a good tool to investigate particle behavior, and a group of Hertz-Mindlin model parameter values are recommended for studying other behaviors of glass particles in the future.

Keywords: particle; discrete element method; Hertz-Mindlin model; numerical simulation

中图分类号：TQ021.9        文献标志码：A

文章编号：1008-5548(2015)03-0001-05

DOI:10.13732/j.issn.1008-5548.2015.03.001

收稿日期：2014-11-16， 修回日期：2014-11-30，在线出版时间：2015-06-24。

基金项目：国家自然科学基金项目，编号：21306097；高等学校博士点专项科研基金项目， 编号：20121010010； 清华大学自主科研计划项目， 编号：20111080971。

第一作者简介：文愿运（1992—），女，硕士研究生，研究方向为多孔喷动床数值模拟。 E-mail: wenyy13@mails.tsinghua.edu.cn。