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首页> 外文期刊>Granular matter >Friction in inertial granular flows: competition between dilation and grain-scale dissipation rates
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Friction in inertial granular flows: competition between dilation and grain-scale dissipation rates

机译：惯性颗粒流中的摩擦：膨胀与晶粒度耗散率之间的竞争

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摘要

Friction plays an important role in the behavior of flowing granular media. The effective friction coefficient is a description of shear strength in both slow and rapid flows of these materials. In this paper, we study the steady state effective friction coefficient mu in a granular material in two steps. First, we develop a new relationship between the steady state effective friction coefficient, the shear rate, the solid fraction, and grain-scale dissipation processes in a simple shear flow. This relationship elucidates the rate-and porosity-dependent nature of effective friction in granular flows. Second, we use numerical simulations to study how the various quantities in the relationship change with shear rate and material properties. We explore how the relationship illuminates the grain-scale dissipation processes responsible for macroscopic friction. We examine how the competing processes of shearing dilation and grain-scale dissipation rates give rise to rate-dependence. We also compare our findings with previous investigations of effective friction in simple shear.
机译：摩擦在粒状介质流动中起着重要作用。有效摩擦系数描述了这些材料在缓慢和快速流动中的剪切强度。在本文中，我们分两步研究了颗粒材料中的稳态有效摩擦系数μ。首先，我们在简单的剪切流中建立了稳态有效摩擦系数，剪切速率，固体分数和晶粒度耗散过程之间的新关系。这种关系阐明了颗粒流中有效摩擦的速率和孔隙率依赖性。其次，我们使用数值模拟来研究关系中的各种量如何随剪切速率和材料特性变化。我们探索这种关系如何照亮引起宏观摩擦的晶粒尺度耗散过程。我们研究了剪切膨胀和晶粒度耗散率的竞争过程如何引起速率依赖性。我们还将我们的发现与以前的简单剪切有效摩擦研究进行了比较。

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