A numerical study on the influence of particle shape on hopper discharge within the polyhedral and multi-sphere discrete element method
A numerical study on the influence of particle shape on hopper discharge within the polyhedral and multi-sphere discrete element method
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DOI：
10.1016/j.powtec.2012.03.041
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发表时间：
2012-08-01
影响因子：
5.2
通讯作者：
Scherer, V.
中科院分区：
文献类型：
--
作者：
Hoehner, D.;Wirtz, S.;Scherer, V.
在这项研究中，使用非粘性、单分散球形和多面体颗粒以及多球体方法生成的颗粒形状对料斗卸料进行了 3D DEM 模拟。为此，概述了用于多面体粒子之间接触检测的公共平面算法，并提出了接触点定义的重要改进。在料斗中，研究了增加颗粒角度对流动特性的影响。此外，选择了三种不同的料斗设计，以进一步研究料斗角度和料斗开口尺寸对流动特性以及不同颗粒形状的影响。结果表明，具有增加角度的颗粒会降低料斗的质量流量，并且在平底料斗（α = 0 度）的情况下会增加排出后的残留量。在所有模拟中，观察到多面体颗粒和簇状颗粒之间存在显着差异，这表明颗粒形状近似的类型是料斗排放 DEM 模拟中必须考虑的参数。 (C) 2012 Elsevier B.V. 保留所有权利。
In this study 3D DEM-simulations of hopper discharge using non-cohesive, monodisperse spherical and polyhedral particles as well as particle shapes generated by the multi-sphere method are carried out. For this purpose an overview of the Common Plane algorithm for contact detection between polyhedral particles is given and an important refinement of the contact point definition is presented. In the hopper the effect of increasing particle angularity on the flow properties is investigated. Moreover, three different hopper designs are chosen, to further examine the influence of hopper angle and hopper opening size on the flow properties in combination with varying particle shapes. It is demonstrated that particles with an increasing angularity reduce the mass flow rate from the hopper and in case of the flat bottom hopper (alpha=0 degrees) increase the residual quantity after discharge. In all simulations significant differences between polyhedral and clustered particles were observed, which indicates that the type of particle shape approximation is a parameter that has to be considered in DEM-simulations of hopper discharge. (C) 2012 Elsevier B.V. All rights reserved.