SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (1): 43-52.DOI: 10.1016/j.cjche.2017.07.021

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

GPU-based discrete element simulation on flow stability of flat-bottomed hopper

Li Peng1,2, Zheng Zou1, Libo Zhang1,2, Qingshan Zhu1,2, Hongzhong Li1,2   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2017-02-21 修回日期:2017-07-29 出版日期:2018-01-28 发布日期:2018-03-01
  • 通讯作者: Qingshan Zhu,E-mail address:qszhu@home.ipe.ac.cn;Hongzhong Li,E-mail address:hzli@ipe.ac.cn
  • 基金资助:

    Supported by the State Key Development Program for Basic Research of China (2015CB251402) and the National Natural Science Foundation of China (21325628, 91334108), and the Mole-8.5 Supercomputing System developed by Institute of Process Engineering, Chinese Academy of Sciences.

GPU-based discrete element simulation on flow stability of flat-bottomed hopper

Li Peng1,2, Zheng Zou1, Libo Zhang1,2, Qingshan Zhu1,2, Hongzhong Li1,2   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-02-21 Revised:2017-07-29 Online:2018-01-28 Published:2018-03-01
  • Contact: Qingshan Zhu,E-mail address:qszhu@home.ipe.ac.cn;Hongzhong Li,E-mail address:hzli@ipe.ac.cn
  • Supported by:

    Supported by the State Key Development Program for Basic Research of China (2015CB251402) and the National Natural Science Foundation of China (21325628, 91334108), and the Mole-8.5 Supercomputing System developed by Institute of Process Engineering, Chinese Academy of Sciences.

摘要: In this study, the flow stability of the flat-bottomed hopper was investigated via GPU-based discrete element method (DEM) simulation. With the material height inside the hopper reducing, the fluctuation of the flow rate indicates an unstable discharge. The flow regions of the unstable discharge were compared with that of the stable discharge, a key transformation zone, where the voidage showed the largest difference between unstable and stable discharge, was revealed. To identify the relevance of the key transformation zone and the hopper flow stability, the voidage variation of the key transformation zone with material height reducing was studied. A sharp increase in the voidage in the key transformation zone was considered to be the standard for judging the unstable hopper flow, and the ‘Top-Bottom effect’ of the hopper was defined, which indicated the hopper flow was unstable when the hopper only had the top area and the bottom area, because the voidage of particles in the top area and the bottom area were both variables.

关键词: Stability, Discrete element method(DEM), Granular flow, Top-Bottom effect, Flow regions

Abstract: In this study, the flow stability of the flat-bottomed hopper was investigated via GPU-based discrete element method (DEM) simulation. With the material height inside the hopper reducing, the fluctuation of the flow rate indicates an unstable discharge. The flow regions of the unstable discharge were compared with that of the stable discharge, a key transformation zone, where the voidage showed the largest difference between unstable and stable discharge, was revealed. To identify the relevance of the key transformation zone and the hopper flow stability, the voidage variation of the key transformation zone with material height reducing was studied. A sharp increase in the voidage in the key transformation zone was considered to be the standard for judging the unstable hopper flow, and the ‘Top-Bottom effect’ of the hopper was defined, which indicated the hopper flow was unstable when the hopper only had the top area and the bottom area, because the voidage of particles in the top area and the bottom area were both variables.

Key words: Stability, Discrete element method(DEM), Granular flow, Top-Bottom effect, Flow regions