Elperin T, Vikhansky A
The Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1999 Aug;60(2 Pt B):1946-50. doi: 10.1103/physreve.60.1946.
A phenomenon of axial band formation in a long rotating cylindrical drum filled with a binary granular mixture is described as a two-stage process. At the first stage, due to different mobility of the large and small particles, a central core occupied by a small-size fraction is formed along the axis of the drum. The axial segregation, i.e., transverse band formation, is found to be associated with the instability of the radially segregated state caused by an asymmetry of the free surface of the granular material. This instability is caused by the difference in the repose angles of two granular fractions and deviation of the filling level of the drum from 0.5.
描述了在装有二元颗粒混合物的长旋转圆柱鼓中轴向带形成的现象，该过程分为两个阶段。在第一阶段，由于大颗粒和小颗粒的迁移率不同，沿鼓的轴线形成了一个由小尺寸颗粒占据的中心核。轴向偏析，即横向带的形成，被发现与颗粒材料自由表面不对称导致的径向偏析状态的不稳定性有关。这种不稳定性是由两种颗粒级分的休止角差异以及鼓的填充水平偏离0.5引起的。
