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The influence of faceted particle shapes on material dynamics in screw conveying
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2021-05-15 , DOI: 10.1016/j.ces.2021.116654
Nicolin Govender , Paul W. Cleary , Daniel N. Wilke , Johannes Khinast

Screw conveyors are widely used in several industries to transport various granular materials needed to manufacture products or components in a product chain. Degradation of the material and variable packing in the screw pitches are some of the significant operational concerns. This paper explores the effect that particle shape has on the material’s behaviour in screw conveyors. Specifically, faceted polyhedral particles are considered and computed on GPUs using the DEM code, Blaze-DEM. Particle shape significantly influences bulk discharge characteristics, in particular, for higher rotation speeds of the screw. Although spheres yield similar bulk discharge rates to symmetric and equiaxed polyhedra at lower rotational speeds, the packing structure and collision dynamics within the screw are shown to be significantly different between the particle shapes. In general polyhedra have a larger fraction of normal impacts between particles and increased abrasion with the screw and enclosing case. On the other hand, spheres have the highest fraction of energy dissipated as shear between particles.



中文翻译:

多面颗粒形状对螺旋输送中物料动力学的影响

螺旋输送机广泛用于多种行业,以输送制造产品链中的产品或组件所需的各种颗粒状物料。材料的降解和螺距中的可变填料是一些重要的操作问题。本文探讨了颗粒形状对螺旋输送机中物料行为的影响。具体来说,考虑使用多面体多面体粒子并使用DEM代码Blaze-DEM在GPU上进行计算。颗粒形状会显着影响整体放电特性,特别是对于螺杆的更高旋转速度而言。尽管球体在较低的转速下产生的体积放电率与对称和等轴多面体相似,颗粒之间的堆积结构和螺杆内的碰撞动力学表现出显着不同。通常,多面体在颗粒之间具有较大比例的正常冲击,并且随着螺钉和外壳的磨损增加。另一方面,由于颗粒之间的剪切力,球体散发的能量最多。

更新日期:2021-05-26
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