中国物理B ›› 2010, Vol. 19 ›› Issue (2): 24601-024601.doi: 10.1088/1674-1056/19/2/024601

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Simulation of random mixed packing of different density particles

何克晶1, 李元元2, 夏伟2, 周照耀2, 钟文镇2, 吴苑标2   

  1. (1)School of Computer Science and Engineering, South China University of Technology, Guangzhou 510641, China; (2)School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
  • 收稿日期:2009-02-22 修回日期:2009-04-07 出版日期:2010-02-15 发布日期:2010-02-15
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (973 Program) (Grant No. 2007CB616905), the National High Technology Research and Development Program of China (863 Program) (Grant No. 2007AA03Z112), the National Natural Science Foundation of China (Grant No. 10805019), and the Natural Science Foundation of Guangdong Province of China (Grant No. 8451064101000083).

Simulation of random mixed packing of different density particles

Li Yuan-Yuan(李元元)a), Xia Wei(夏伟) a),Zhou Zhao-Yao(周照耀)a), He Ke-Jing(何克晶)b)†, Zhong Wen-Zhen(钟文镇)a), and Wu Yuan-Biao(吴苑标) a)   

  1. a School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China; b  School of Computer Science and Engineering, South China University of Technology, Guangzhou 510641, China
  • Received:2009-02-22 Revised:2009-04-07 Online:2010-02-15 Published:2010-02-15
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (973 Program) (Grant No. 2007CB616905), the National High Technology Research and Development Program of China (863 Program) (Grant No. 2007AA03Z112), the National Natural Science Foundation of China (Grant No. 10805019), and the Natural Science Foundation of Guangdong Province of China (Grant No. 8451064101000083).

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摘要： This paper presents the effects of density difference on the three-dimensional (3D) distribution of random mixed packing. The random mixed packing dynamics of particles of two different densities are simulated. The initial state is homogeneous, but the final packing state is inhomogeneous. The segregation phenomenon (inhomogeneous distribution) is also observed. In the final state, the top layers are composed of mostly light particles. The several layers beneath the top contain more heavy particles than light particles. At the bottom, they also contain more heavy particles than light particles. Furthermore, at both the top and the bottom, particle clustering is observed. The current study also analyses the cause of this inhomogeneity in detail. The main cause of this phenomenon is the velocity difference after collision of these two types of particles induced by the density difference. The present study reveals that even if particles were perfectly mixed, the packing process would lead to the final inhomogeneous mixture. It suggests that special treatment may be required to get the true homogeneous packing.

Abstract: This paper presents the effects of density difference on the three-dimensional (3D) distribution of random mixed packing. The random mixed packing dynamics of particles of two different densities are simulated. The initial state is homogeneous, but the final packing state is inhomogeneous. The segregation phenomenon (inhomogeneous distribution) is also observed. In the final state, the top layers are composed of mostly light particles. The several layers beneath the top contain more heavy particles than light particles. At the bottom, they also contain more heavy particles than light particles. Furthermore, at both the top and the bottom, particle clustering is observed. The current study also analyses the cause of this inhomogeneity in detail. The main cause of this phenomenon is the velocity difference after collision of these two types of particles induced by the density difference. The present study reveals that even if particles were perfectly mixed, the packing process would lead to the final inhomogeneous mixture. It suggests that special treatment may be required to get the true homogeneous packing.

Key words: mixed packing, different densities, granular particle, discrete element method simulation

中图分类号:  (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)

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