The discharge of granular media from hoppers plays a vital role in many solids handling operations. The dynamic flow of poly‐disperse nonspherical particles differs markedly from mono‐disperse spheres and highlights the need to rigorously account for particle shape effects. The multisphere discrete element method (MS‐DEM) was utilized here to examine the bulk packing fraction, discharge rate, collisional stress tensor, and order parameter of a bi‐disperse sphere‐rod mixture evacuating a hopper. A modified form of the Myers and Sellers correlation with variable shape factor is capable of replicating the MS‐DEM discharge data. The collisional stress tensor is observed to be highly symmetric for mono‐disperse spheres but becomes asymmetric when rod‐like particles are introduced. The order parameter within the hopper increases significantly during discharge and the rod‐like particles undergo shear induced alignment with their long dimensions orthogonal to the outflow plane.

中文翻译：

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球形和棒状颗粒混合物通过多球体的漏斗流动

从料斗中排出颗粒状介质在许多固体处理操作中起着至关重要的作用。多分散非球形颗粒的动态流动与单分散球体明显不同，并突出显示了需要严格考虑颗粒形状影响的需求。此处使用多球离散元方法（MS-DEM）来检查散装料斗的双分散球杆混合物的散装率，排放率，碰撞应力张量和阶跃参数。具有可变形状因子的Myers和Sellers相关性的修改形式能够复制MS-DEM排放数据。观察到碰撞应力张量对于单分散球体是高度对称的，但是当引入棒状颗粒时，它变得不对称。