Experimental and numerical investigation on the influence of particle shape and shape approximation on hopper discharge using the discrete element method
Experimental and numerical investigation on the influence of particle shape and shape approximation on hopper discharge using the discrete element method
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DOI：
10.1016/j.powtec.2012.11.004
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发表时间：
2013-02
影响因子：
5.2
通讯作者：
D. Hoehner;S. Wirtz;V. Scherer
中科院分区：
文献类型：
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作者：
D. Hoehner;S. Wirtz;V. Scherer
本文采用离散元方法(DEM)对漏斗内球体和多面体切屑的出流进行了实验和数值研究。在DEM中，切屑分别用多面体和光滑多面体来近似，因此可以考察锐边和光滑粒子几何形状对放电特性的影响。模拟结果与实验结果基本吻合，从而验证了DEM以及多面体和光滑多面体近似方法对非球形粒子几何形状模拟的充分性。与球体相比，骰子表现出更大的流动阻力和在料斗底部壁上形成堆积的准备。用骰子的多面体近似更好地近似了这两种现象，显示了所选形状近似方案对数值结果的影响。
In this study experimental and numerical investigations with the discrete element method (DEM) on the discharge of spheres and polyhedral dices from a hopper are conducted. In DEM the dices are approximated by polyhedra and smoothed polyhedra respectively and hence allow examining the influence of sharply-edged and smooth particle geometries on the discharge properties. Simulation results are in good general agreement with the experiments and hence demonstrate the adequacy of DEM as well as polyhedral and smoothed polyhedral approximation schemes to simulate non-spherical particle geometries. Compared to spheres the dices exhibit an increased flow resistance and readiness to form pile-ups at the bottom walls of the hopper. Both phenomena are better approximated using polyhedral approximations of the dices, showcasing the influence of the selected shape approximation scheme on the numerical results.