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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Published on: February 22, 2018

Patterns and flow in frictional fluid dynamics.

B Sandnes1, E G Flekkøy, H A Knudsen

  • 1School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, New South Wales 2006, Australia. bjornar.sandnes@fys.uio.no

Nature Communications
|April 21, 2011
PubMed
Summary
This summary is machine-generated.

Researchers mapped fluid and granular flow patterns, revealing new dynamics like stick-slip bubbles and destabilized viscous fingers. This work unifies understanding of frictional and viscous regimes in granular mixtures.

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Area of Science:

  • Fluid Dynamics and Granular Physics
  • Complex Systems and Pattern Formation

Background:

  • Extensive studies exist on pattern formation in simple fluids and suspensions, identifying structures like viscous fingers and fractals in capillary-dominated flows.
  • However, fundamental displacement morphologies in frictional fluids and granular mixtures remain largely uncharacterized.

Purpose of the Study:

  • To map the fundamental displacement morphologies in frictional fluids and granular mixtures.
  • To investigate the influence of Coulomb friction and compressibility on fluid dynamics.
  • To characterize new dynamic modes across a range of injection rates.

Main Methods:

  • Incorporation of Coulomb friction and compressibility into fluid dynamics models.
  • Systematic variation of injection rates over several orders of magnitude.
  • Classification of fluid dynamics into distinct frictional and viscous regimes.
  • Development of extended phase diagrams to describe emerging morphologies.

Main Results:

  • Discovery of surprising fluid dynamics, including highly intermittent flow and a transition to quasi-continuous dynamics.
  • Characterization of new dynamic modes: stick-slip bubbles at low injection rates and destabilized viscous fingers at high rates.
  • Identification of distinct frictional and viscous flow regimes within granular mixtures.

Conclusions:

  • The study presents a unified description of emerging morphologies in granular mixtures.
  • Extended phase diagrams provide a comprehensive classification of fluid dynamics based on injection rate and flow regime.
  • This work significantly advances the understanding of complex flow behaviors in granular materials.