Zuriguel I, Peixinho J, Mullin T
Departamento de Física y Matemática Aplicada, Universidad de Navarra, Pamplona 31008, Spain.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 May;79(5 Pt 1):051303. doi: 10.1103/PhysRevE.79.051303. Epub 2009 May 14.
Results are presented of an experimental investigation into patterned size segregation of binary granular mixtures in a thin rotating drum that is half full. It is observed that streaks of small particles are formed within regions of large ones where the integer number of streaks is fixed over a range of rotation rate of the drum. Different patterns form in adjacent parameter ranges and the dynamics associated with the exchange between neighboring states is analyzed using angular spatiotemporal diagrams. These help to reveal properties of the merging mechanism for streaks of small particles. We report experimental evidence that the merging of streaks is mediated by the movement of a surplus material in a direction opposite to that of the rotation of the drum. The excess material is distributed throughout the pattern and the extra streak eventually disappears.
给出了对一个半满的薄旋转鼓中二元颗粒混合物的图案化尺寸分离进行实验研究的结果。观察到在大颗粒区域内形成了小颗粒条纹，在鼓的一定转速范围内条纹的整数数量是固定的。在相邻的参数范围内形成了不同的图案，并使用角时空图分析了与相邻状态之间交换相关的动力学。这些有助于揭示小颗粒条纹合并机制的特性。我们报告了实验证据，表明条纹的合并是由多余物质沿与鼓旋转方向相反的方向移动介导的。多余物质分布在整个图案中，额外的条纹最终消失。
