Rajchenbach J
Laboratoire de Physique de la Matiére Condensée, Université de Nice Sophia-Antipolis, Parc Valrose, 06108, Nice Cedex, France.
Eur Phys J E Soft Matter. 2004 Aug;14(4):367-71. doi: 10.1140/epje/i2004-10025-1.
The paper reviews some peculiar properties exhibited by granular flows. We emphasize the inability of kinetic theory and of Bagnold's heuristic approach to describe the rapid regime of densely packed flows, characterized by the breakdown of the binary collision picture and by multibody long-lasting contacts. We suggest that deformation waves through the continuous paths of contacts can be effective to transport momentum and energy through the bulk, in a time very short compared to the inverse of the shear rate. This mechanism could explain some key rheological features encountered in dense granular materials.
本文回顾了颗粒流所展现出的一些独特性质。我们强调了动力学理论和巴格诺德启发式方法在描述密集堆积流快速状态方面的无能，这种状态的特征是二元碰撞图景的失效以及多体长时间接触。我们认为，通过连续接触路径的变形波能够在与剪切速率的倒数相比非常短的时间内有效地在整体中传输动量和能量。这种机制可以解释在致密颗粒材料中遇到的一些关键流变学特征。
