Flow regimes and repose angle in a rotating drum filled with highly concave particles

Weiyi Wang, Jonathan Barés, Jonathan Barés, Emilien Azéma
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Abstract

We present a series of experiments investigating the flow regimes and repose angles of highly concave particle packings in a rotating drum. By varying grain geometry from spherical to highly non-convex shapes, adjusting frictional properties and the particle number of branches, we examine how these parameters and the drum speed influence the flow behavior. Our study identifies two distinct flow regimes: the rolling regime, where granular matter exhibits solid-like behavior near the walls and flows like a liquid near the free surface, and the slumping regime, characterized by cyclic avalanches and solid body rotations. Using quantitative criteria such as the repose angle difference and the area ratio of particle packings, we construct phase diagrams delineating the cross-over between these regimes. Our findings highlight the significant effects of particle concavity, friction, and rotation speed on the flow dynamics of granular materials, providing new insights into the mechanical behaviors of \emph{meta-granular matter}.
装满高凹颗粒的旋转滚筒中的流态和重置角
我们介绍了一系列研究旋转滚筒中高凹颗粒填料的流动状态和重定角度的实验。通过改变从球形到高度非凸形的颗粒几何形状、调整摩擦特性和颗粒分支数,我们研究了这些参数和转鼓速度对流动行为的影响。我们的研究发现了两种不同的流动状态:一种是滚动状态,颗粒物质在靠近壁面的地方表现出类似固体的行为,而在靠近自由表面的地方则像液体一样流动;另一种是坍塌状态,其特点是周期性的雪崩和固体体旋转。我们利用定量标准(如颗粒堆积的重置角差和面积比)构建了相图,描述了这两种状态之间的交叉。我们的发现凸显了颗粒凹度、摩擦力和旋转速度对颗粒材料流动动力学的重要影响,为我们了解金属颗粒物质的力学行为提供了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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