Impulse distributions in dense granular flows: signatures of large-scale spatial structures
arXiv:cond-mat/0301201 · doi:10.1209/epl/i2003-10190-3
Abstract
In this paper we report the results of simulations of a 2D gravity driven, dissipative granular flow through a hopper system. Measurements of impulse distributions P(I) on the simulated system show flow-velocity-invariant behavior of the distribution for impulses larger than the average impulse <I>. For small impulses, however, P(I) decreases significantly with flow velocity, a phenomenon which can be attributed exclusively to collisions between grains undergoing frequent collisions. Visualizations of the system also show that these frequently colliding particles tend to form increasingly large linear clusters as the flow velocity decreases. A model is proposed for the form of P(I), given distributions of cluster size and velocity, which accurately predicts the observed form of the distribution. Thus the impulse distribution provides some insight into the formation and properties of these ``dynamic'' force chains.
4 pages, 4 figures
References in corpus (7)
- Force Distribution in a Granular Medium
- Force distributions near the jamming and glass transitions
- Non-Gaussian velocity distributions in excited granular matter in the absence of clustering
- Shock-Like Dynamics of Inelastic Gases
- Large Force Fluctuations in a Flowing Granular Medium
- Multi-scale clustering in granular surface flows
- Dynamics and stress in gravity driven granular flow
Cited by in corpus (11)
- Patterns and Collective Behavior in Granular Media: Theoretical Concepts
- Pair Correlation Function Characteristics of Nearly Jammed Disordered and Ordered Hard-Sphere Packings
- On the Rigidity of Amorphous Solids
- Geometric interpretation of pre-vitrification in hard sphere liquids
- Heterogeneous Dynamics, Marginal Stability and Soft Modes in Hard Sphere Glasses
- On the rigidity of a hard sphere glass near random close packing
- Long Range Correlations in Granular Shear Flow I: Numerical Evidence
- Stress and large-scale spatial structures in dense, driven granular flows
- Jamming transition of randomly pinned systems
- Growing length scale in gravity-driven dense granular flow
- Peano modes at the D=2 delocalization transition