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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Published on: December 4, 2017

Velocity fluctuations in dense granular flows.

John J Drozd¹, Colin Denniston

¹Department of Applied Mathematics, The University of Western Ontario, London, Ontario, Canada N6A 5B8.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|November 13, 2008

Summary

This summary is machine-generated.

Simulations reveal three distinct velocity distributions in dry granular flow, dependent on grain density and state (free-fall, fluid, glassy). These findings offer insights into granular dynamics and phase transitions.

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Area of Science:

Physics
Fluid Dynamics
Materials Science

Background:

Granular flow dynamics are complex and influenced by particle interactions.
Understanding velocity distributions is key to characterizing granular materials.

Purpose of the Study:

To investigate velocity fluctuations in dry granular flow using simulations.
To identify different classes of velocity distributions and their governing factors.

Main Methods:

Simulated mono- and polydisperse spherical grains falling in a vertical chute.
Analysis of velocity distributions based on local density and grain state.

Main Results:

Identified three distinct classes of velocity distributions: free-fall, fluid, and glassy states.
Observed power-law tails in transition areas, potentially artifacts of distribution class crossover.
Found evidence linking transitions to second-order dynamical phase transitions.

Conclusions:

The study characterizes granular flow velocity distributions across different states within a single system.
Findings suggest power-law tails may arise from crossovers between distribution classes.
Transitions between granular flow states may represent second-order dynamical phase transitions.