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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

Growing length scale in gravity-driven dense granular flow.

Shubha Tewari1, Bidita Tithi, Allison Ferguson

  • 1Department of Physics, Mount Holyoke College, 50 College Street, South Hadley, Massachusetts 01075, USA. stewari@mtholyoke.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Simulations show that as particle flow slows, velocity and stress fluctuations become more correlated, indicating growing length and time scales near jamming in dense granular systems.

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Area of Science:

  • Physics
  • Granular Mechanics
  • Computational Physics

Background:

  • Dense granular flows exhibit complex behaviors near jamming.
  • Understanding jamming is crucial for predicting material flow and stability.

Purpose of the Study:

  • To investigate the dynamics of a 2D bidisperse granular system approaching jamming.
  • To analyze the spatial and temporal correlations of velocity and stress fields.

Main Methods:

  • Simulated a 2D dense, bidisperse system of inelastic hard disks in a vertical tube.
  • Reduced particle flow by narrowing the outlet to induce jamming.
  • Defined coarse-grained velocity and stress fields.
  • Analyzed two-point temporal and spatial correlation functions.

Main Results:

  • Observed increasing correlations in velocity and stress fluctuations as the system approached jamming.
  • Identified a growing characteristic length scale associated with these correlations.
  • Detected a growing characteristic time scale linked to the jamming transition.

Conclusions:

  • Granular systems exhibit critical slowing down phenomena near the jamming transition.
  • Correlation functions provide insights into the emergence of macroscopic behavior from microscopic interactions.