Two mechanisms of momentum transfer in granular flows.
- AMER PHYSICAL SOC
- Publication Type:
- Journal Article
- Physical review. E, 2020, 101, (5-1)
- Issue Date:
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This Rapid Communication highlights the physical processes at the origin of the constitutive law of dense granular flows. In simulated plane shear flows, we present a micro-mechanical expression for the phenomenological friction law μ(I). The expression highlights two distinct pathways for momentum transport-through either balanced contact forces or grain micro-acceleration. We show that these two rate-dependent processes control and explain the friction law. This understanding may help advance rheological models for granular materials and other soft materials such as emulsions and suspensions.
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