A binary mixture is mixed in a rotating drum composed by 19 rings with different inner diameters. It is found that the larger particles are concentrated in the rings with smaller inner diameters. The collection of the larger particles in these rings is due to the particle dynamic angle of repose. The transition from the particle segregation core pattern at the end wall to the good radial mixing rings is through a transient turning comet segregation pattern. This transition is closely related to the distance from the ring with the smallest inner diameter to the ring with the largest inner diameter. Having a higher fraction of larger particles in a ring requires both the collection ring having a smaller inner diameter and a smoother inner diameter transition to the neighboring rings.

中文翻译：

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内径变化的转鼓中轴向和径向竞争偏析的研究

二元混合物在由19个内径不同的环组成的转鼓中混合。发现较大的颗粒集中在具有较小内径的环中。这些环中较大颗粒的聚集归因于颗粒的动态休止角。从端壁处的颗粒偏析核心图案到良好的径向混合环的过渡是通过瞬时转向彗星偏析图案进行的。该过渡与从具有最小内径的环到具有最大内径的环的距离密切相关。在环中具有较高分数的较大颗粒既需要具有较小内径的收集环，又需要平滑的内径过渡到相邻环。