DEM simulation of cubical particle percolation in a packed bed
DEM simulation of cubical particle percolation in a packed bed
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填充床中立方颗粒渗流的 DEM 模拟
DOI：
10.1016/j.powtec.2019.08.012
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
Shen Yansong
中科院分区：
文献类型：
--
作者：
Kou Mingyin;Zhou Heng;Wu Shengli;Shen Yansong
本文采用离散元法（DEM）研究了立方体颗粒在填充床层中的渗流问题。综合分析了恢复系数、滑动系数、滚动系数和直径比等关键变量对立方颗粒渗流行为的影响。结果表明：与球形颗粒相比，立方体颗粒在充填床层内的渗流过程中也具有恒定的垂向速度，但其渗流速度较大，径向离中心距离较小；恢复系数影响立方体渗流行为。随着恢复系数的增大，渗流速度减小，径向弥散系数增大。滑动摩擦系数和滚动摩擦系数的影响趋势相同。随着摩擦系数的增大，渗流速度和径向弥散减小。立方颗粒直径与填料颗粒直径的比值（直径比）是另一个显著影响渗流行为的主要变量。随着径比的减小，渗流速度和径向弥散系数增大。模拟有助于理解多尺度立方体材料的渗流和偏析，优化立方体颗粒的处理和混合。
In this paper, percolation of cubical particles through a packed bed is studied using discrete element method (DEM). The influences of some key variables e.g. restitution coefficient, sliding coefficient, rolling coefficient and diameter ratio on cubical particles percolation behaviour were comprehensively analyzed. The results show that, compared with the sphere particles, cubical particles also have a constant vertical velocity during percolating in the packed bed, but it has a larger percolation velocity and a less off-center of radial distance. Restitution coefficient affects the cube percolation behaviour. With increasing the restitution coefficient, the percolation velocity decreases, but the radial dispersion coefficient increases. Effects of sliding friction coefficient and rolling friction coefficient show the same tendency. The percolation velocity and radial dispersion decrease with the increase of friction coefficient. The ratio of cubical particle diameter to packing particle diameter (diameter ratio) is another dominant variable that significantly affect the percolation behaviour. The percolation velocity and radial dispersion coefficient increases with decreasing the diameter ratio. The simulations are useful for understanding percolation and segregation of multi-scale cubical materials and optimization in cubical particles handling and mixing.
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影响因子：
10
作者：
Alexander JF;Kozlovskaya V;Chen J;Kuncewicz T;Kharlampieva E;Godin B
通讯作者：
Godin B
影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
3.5
作者：
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通讯作者：
Mahbubur Rahman;Haiping Zhu;A. Yu;J. Bridgwater