Discrete characterization tools for cohesive granular material
Discrete characterization tools for cohesive granular material
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DOI：
10.1016/s0032-5910(00)00398-3
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发表时间：
2001-05
影响因子：
5.2
通讯作者：
S. Nase;W. L. Vargas;A. Abatan;J. J. McCarthy-J.
中科院分区：
文献类型：
--
作者：
S. Nase;W. L. Vargas;A. Abatan;J. J. McCarthy-J.
颗粒流在科学上和工业上都很重要。通常情况下，颗粒之间的内聚力是正常的，而不是例外;然而，大多数颗粒材料的研究都是针对无粘性材料的。由于关于无内聚流的知识相对较多，因此理解从无内聚流到内聚流的过渡是特别有意义的。在这项工作中，我们研究的系统中的主要模式的凝聚力是由于间隙液体（毛细管凝聚力）。计算和实验都被用来探索一系列的内聚强度（从无内聚到有内聚）。我们提出了两个离散的表征标准，液体诱导的粒子级凝聚力的物理图像的基础上，这似乎在静态和流动系统中工作得很好。最后，我们解决这种方法的局限性，并讨论潜在的扩展到其他模式的凝聚力为主的系统。
Granular flow is important scientifically as well as industrially. Often, cohesive forces between grains are the norm, rather than the exception; yet, the majority of research in granular materials has been directed at cohesionless materials. Due to the relatively large body of knowledge regarding cohesionless flows, gaining an understanding of the transition from cohesionless to cohesive behavior is of particular interest. In this work, we study systems where the predominant mode of cohesion is due to interstitial liquid (capillary cohesion). Both computations and experiments are used to explore a range of cohesive strengths (from cohesionless to cohesive). We propose two discrete characterization criteria, based on the physical picture of liquid-induced particle-level cohesion, which seem to work well in both static and flowing systems. Finally, we address limitations of this approach and discuss potential extensions to systems dominated by other modes of cohesion.