摘要
通过用分子动力学方法对颗粒物质流的计算机模拟 ,研究发现增大通道宽度可以使二维颗粒流从稀疏流转变为密集流状态 .通过对不同通道宽度下 ,固定开口为 9 5d的颗粒流和漏斗口以上 9 5d× 8d区域记录的模拟结果分析 ,发现随通道宽度增大 ,密度变大、温度降低 .当“颗粒温度”T较低时 (T m <0 .0 5J kg) ,颗粒流内部接触数开始超过 1 2 ,同时出现较为牢固的横向链状颗粒团簇 。
In this paper,we use the molecular dynamics simulation to study the phenomena that the granular flow changes from dilute flow to dense flow by increasing the channel width at a fixed orifice of 9 5 d (d is the diameter of grains). In the area over the orifice,the density of flow increases and the granular temperature decreases with the increase of channel width. The change from dilute flow to dense flow begins at a channel width of 24 d ,a lower granular temperature( T/m =0 05 J/kg) and a larger coordination number of 1 2 The mechanism is a structural change in the granular flow,since a wider channel results in more horizontal chains of particles and a lower temperature makes these chains more stable.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第12期4277-4281,共5页
Acta Physica Sinica
基金
国家自然科学基金 (批准号 :10 2 740 71)
和国家高技术惯性约束聚变基金(批准号 :2 0 0 1AA84ts0 6)资助的课题~~
