Nonuniformities in the angle of repose and packing fraction of large heaps of particles.
Nonuniformities in the angle of repose and packing fraction of large heaps of particles.
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大颗粒堆的休止角和堆积分数的不均匀性
DOI：
10.1103/physrevlett.109.128001
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发表时间：
2012
影响因子：
8.6
通讯作者：
Thorsten Pöschel
中科院分区：
文献类型：
--
作者：
Nikola Topić;Jason A. C. Gallas;Thorsten Pöschel
我们报告了一个数值研究的结构特性的非常大的三维堆积的颗粒产生的弹道沉积从扩展的圆形下降区域。非常大的堆被发现包含三个新的几何特征之前没有观察到：他们可能有两个外部的休止角，休止的内角，和四个不同的包装分数（密度）区域。这种特性被证明是直接相关的下降区的大小。此外，我们还描述了沉积过程中的噪声如何影响最终的堆结构。
We report a numerical investigation of the structural properties of very large three-dimensional heaps of particles produced by ballistic deposition from extended circular dropping areas. Very large heaps are found to contain three new geometrical characteristics not observed before: they may have two external angles of repose, an internal angle of repose, and four distinct packing fraction (density) regions. Such characteristics are shown to be directly correlated with the size of the dropping zone. In addition, we also describe how noise during the deposition affects the final heap structure.