中国物理B ›› 2017, Vol. 26 ›› Issue (7): 70502-070502.doi: 10.1088/1674-1056/26/7/070502

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Collective transport of Lennard–Jones particles through one-dimensional periodic potentials

Jian-hui He(何健辉), Jia-le Wen(温家乐), Pei-rong Chen(陈沛荣), Dong-qin Zheng(郑冬琴), Wei-rong Zhong(钟伟荣)   

  1. Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
  • 收稿日期:2017-01-13 修回日期:2017-03-30 出版日期:2017-07-05 发布日期:2017-07-05
  • 通讯作者: Wei-rong Zhong E-mail:wrzhong@hotmail.com
  • 基金资助:

    Project supported by the Natural Science Foundation of Guangdong Province,China (Grant No.2014A030313367) and the Fundamental Research Fund for the Central Universities,China (Grant No.11614341).

Collective transport of Lennard–Jones particles through one-dimensional periodic potentials

Jian-hui He(何健辉), Jia-le Wen(温家乐), Pei-rong Chen(陈沛荣), Dong-qin Zheng(郑冬琴), Wei-rong Zhong(钟伟荣)   

  1. Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
  • Received:2017-01-13 Revised:2017-03-30 Online:2017-07-05 Published:2017-07-05
  • Contact: Wei-rong Zhong E-mail:wrzhong@hotmail.com
  • Supported by:

    Project supported by the Natural Science Foundation of Guangdong Province,China (Grant No.2014A030313367) and the Fundamental Research Fund for the Central Universities,China (Grant No.11614341).

摘要:

The surrounding media in which transport occurs contains various kinds of fields, such as particle potentials and external potentials. One of the important questions is how elements work and how position and momentum are redistributed in the diffusion under these conditions. For enriching Fick's law, ordinary non-equilibrium statistical physics can be used to understand the complex process. This study attempts to discuss particle transport in the one-dimensional channel under external potential fields. Two kinds of potentials–-the potential well and barrier–-which do not change the potential in total, are built during the diffusion process. There are quite distinct phenomena because of the different one-dimensional periodic potentials. By the combination of a Monte Carlo method and molecular dynamics, we meticulously explore why an external potential field impacts transport by the subsection and statistical method. Besides, one piece of evidence of the Maxwell velocity distribution is confirmed under the assumption of local equilibrium. The simple model is based on the key concept that relates the flux to sectional statistics of position and momentum and could be referenced in similar transport problems.

关键词: transport, external potential, collective diffusion, Maxwell velocity distribution

Abstract:

The surrounding media in which transport occurs contains various kinds of fields, such as particle potentials and external potentials. One of the important questions is how elements work and how position and momentum are redistributed in the diffusion under these conditions. For enriching Fick's law, ordinary non-equilibrium statistical physics can be used to understand the complex process. This study attempts to discuss particle transport in the one-dimensional channel under external potential fields. Two kinds of potentials–-the potential well and barrier–-which do not change the potential in total, are built during the diffusion process. There are quite distinct phenomena because of the different one-dimensional periodic potentials. By the combination of a Monte Carlo method and molecular dynamics, we meticulously explore why an external potential field impacts transport by the subsection and statistical method. Besides, one piece of evidence of the Maxwell velocity distribution is confirmed under the assumption of local equilibrium. The simple model is based on the key concept that relates the flux to sectional statistics of position and momentum and could be referenced in similar transport problems.

Key words: transport, external potential, collective diffusion, Maxwell velocity distribution

中图分类号:  (Classical transport)

  • 05.60.Cd
47.60.Dx (Flows in ducts and channels) 05.70.Ln (Nonequilibrium and irreversible thermodynamics) 47.63.-b (Biological fluid dynamics)