摘要
利用离散元方法模拟了均匀球形颗粒的随机排列过程．在模拟过程中考虑了重力、颗粒间的接触力、摩擦力以及范德华力（VDWI）；颗粒的运动包括平动和转动．研究表明，颗粒间的作用力对球形颗粒随机排列体的结构影响很大．对于粒径为100μm球形颗粒，如果不考虑颗粒之间的摩擦力和范德华力，排列体为随机密排和有序密排的混合体，其排列密度为0．8696；考虑颗粒间的摩擦力和范德华力：排列密度降低为0．8213．描述了排列体几何结构随时间的演化过程、特定颗粒在排列过程中的运动轨迹及颗粒配位数的分布规律．同时给出了不同条件下二元系的排列结果．
A computer simulation for evolution of random smictures of spherical pericles in two dimensions has been performed by the distinct element method. The forces among the particles considered were gravity, friction force and Van Der Waals Interaction(VDWI). The motion of particles involved translation and rotation. For 100 μm particles, if friction and VDWI were not considered, the packing assembly was a mixture of random packing and order packing with packing density of 0.869 6, if friction and VDWI were taken into account, the packing density was 0.821 3. To study the procedure of packing, packing densities with different time, particle trajectory and coordination number were examined. The packing structures of binary system with different conditions were also given.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1999年第4期387-391,共5页
Journal of University of Science and Technology Beijing
基金
国家"九五"攻关重点课题!95-527-03-04-01
关键词
离散元
随机排列
排列密度
计算机模拟
球形颗粒
particle random packing
distinct element method
coordination number
packing density
