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Granular labyrinth structures in confined geometries.

Henning Arendt Knudsen1, Bjørnar Sandnes, Eirik Grude Flekkøy

  • 1Department of Physics, University of Oslo, Oslo, Norway. hak@fys.uio.no

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 21, 2008
PubMed
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When fluid is withdrawn from a particle-fluid mixture in a Hele-Shaw cell, particles form intricate mazelike patterns. This phenomenon is driven by capillary and pressure forces, creating treelike structures with predictable length scales.

Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Pattern formation

Background:

  • Pattern formation is ubiquitous in natural systems.
  • Particle-fluid dispersions exhibit complex behaviors under external forces.

Purpose of the Study:

  • To investigate the mazelike pattern formation in particle-fluid dispersions during fluid withdrawal.
  • To understand the underlying physical mechanisms and governing parameters.

Main Methods:

  • Experiments using a Hele-Shaw cell with particle-fluid dispersions.
  • Development of a simulator to model the pattern formation process.
  • Theoretical analysis to predict pattern characteristics.

Main Results:

  • Intriguing mazelike patterns formed by particles upon fluid withdrawal.

Related Experiment Videos

  • Capillary and pressure forces drive particle aggregation into treelike structures.
  • Characteristic length scale depends on particle volume fraction and Hele-Shaw cell plate separation.

    • Conclusions:

    • The study successfully simulates and explains the observed mazelike patterns.
    • A predictive theory for the characteristic wavelengths of the patterns was developed.
    • The findings offer insights into self-organization in complex fluids.