The statistics of particle velocities in dense granular flows
| Autor: | Prabhu R. Nott, Sudheshna Moka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Friction
FOS: Physical sciences General Physics and Astronomy Condensed Matter - Soft Condensed Matter Granular material Power law Physics::Fluid Dynamics Motion Particle velocity Shear velocity Particle Size Anisotropy Condensed Matter - Statistical Mechanics Probability Physics Statistical Mechanics (cond-mat.stat-mech) Particle-laden flows Mechanics Chemical Engineering Biomechanical Phenomena Classical mechanics Shear (geology) Soft Condensed Matter (cond-mat.soft) Particle size Gases Stress Mechanical Rheology Algorithms Statistical Distributions |
| Popis: | We present measurements of the particle velocity distribution in the flow of granular material through vertical channels. Our study is confined to dense, slow flows where the material shears like a fluid only in thin layers adjacent to the walls, while a large core moves without continuous deformation, like a solid. We find the velocity distribution to be non-Gaussian, anisotropic, and to follow a power law at large velocities. Remarkably, the distribution is identical in the fluid-like and solid-like regions. The velocity variance is maximum at the core, defying predictions of hydrodynamic theories. We show evidence of spatially correlated motion, and propose a mechanism for the generation of fluctuational motion in the absence of shear. Submitted to Phys. Rev. Lett |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|