中国物理B ›› 2010, Vol. 19 ›› Issue (5): 56404-056404.doi: 10.1088/1674-1056/19/5/056404

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A molecular dynamics simulation of segregation behaviours of horizontally vibrated binary granular mixture

夏继宏, 尤玉伟, 汪盼盼, 王炜路, 刘长松   

  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2009-07-17 修回日期:2009-09-29 出版日期:2010-05-15 发布日期:2010-05-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.~10674135), and by the Centre for Computational Science, Hefei Institutes of Physical Sciences, China.

A molecular dynamics simulation of segregation behaviours of horizontally vibrated binary granular mixture

Xia Ji-Hong(夏继宏), You Yu-Wei(尤玉伟), Wang Pan-Pan(汪盼盼), Wang Wei-Lu(王炜路), and Liu Chang-Song(刘长松)   

  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2009-07-17 Revised:2009-09-29 Online:2010-05-15 Published:2010-05-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.~10674135), and by the Centre for Computational Science, Hefei Institutes of Physical Sciences, China.

摘要: This paper performs the two-dimensional, soft-sphere molecular dynamics simulations to study the granular segregation in a binary granular mixture with the same size but different density in the container with the sawtooth base under horizontal vibration. The segregation phase diagram is presented in the acceleration-frequency space. When the acceleration is high enough to result in relative motions of the particles, the system can be in various states (mixed state, vertical and horizontal segregation state), which depend on both acceleration and frequency. Due to the sawtooth base there is stratified flow effect besides density effect. The density effect raises the light particles. The stratified flow drives the particles in the upper levels to the right and the particles in the lower particles to the left, those fact results in the appearance of the left segregation state. The left segregation state can be changed to the right segregation by changing the shape of the sawtooth. As the vibration frequency increases, the stratified flow effect becomes weaker and weaker, so at high vibration frequencies the vertical segregation state appears instead of the left segregation state.

Abstract: This paper performs the two-dimensional, soft-sphere molecular dynamics simulations to study the granular segregation in a binary granular mixture with the same size but different density in the container with the sawtooth base under horizontal vibration. The segregation phase diagram is presented in the acceleration-frequency space. When the acceleration is high enough to result in relative motions of the particles, the system can be in various states (mixed state, vertical and horizontal segregation state), which depend on both acceleration and frequency. Due to the sawtooth base there is stratified flow effect besides density effect. The density effect raises the light particles. The stratified flow drives the particles in the upper levels to the right and the particles in the lower particles to the left, those fact results in the appearance of the left segregation state. The left segregation state can be changed to the right segregation by changing the shape of the sawtooth. As the vibration frequency increases, the stratified flow effect becomes weaker and weaker, so at high vibration frequencies the vertical segregation state appears instead of the left segregation state.

Key words: granular systems, segregation, molecular dynamics methods

中图分类号:  (Phase equilibria)

  • 64.75.-g
81.30.Dz (Phase diagrams of other materials) 81.05.Rm (Porous materials; granular materials) 81.40.Jj (Elasticity and anelasticity, stress-strain relations) 62.20.D- (Elasticity)