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Clogging of Cohesive Particles in a Two-Dimensional Hopper.

Johnathan Hoggarth1, Pablo E Illing2, Eric R Weeks2

  • 1McMaster University, Department of Physics and Astronomy, 1280 Main Street West, Hamilton, L8S 4M1, Ontario, Canada.

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Summary
This summary is machine-generated.

Cohesive particle clogging in hoppers is enhanced by stronger cohesion. This phenomenon is governed by a cohesive length scale, not particle diameter, under strong cohesion.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Physics of granular materials

Background:

  • Hopper flow is crucial in industrial processes.
  • Understanding particle clogging is essential for process efficiency.
  • Cohesive forces significantly influence granular material flow.

Purpose of the Study:

  • To investigate the clogging of cohesive particles in a two-dimensional hopper.
  • To determine the key parameters governing clogging behavior.
  • To establish a predictive model for cohesive particle clogging.

Main Methods:

  • Experimental investigation using buoyant, monodisperse oil droplets in an aqueous solution.
  • Computational simulations to complement experimental findings.
  • Systematic variation of droplet size, buoyant force, cohesion, and hopper opening.

Main Results:

  • Increased cohesion leads to enhanced particle clogging.
  • A cohesive length scale, derived from balancing forces, governs clogging.
  • Data collapses onto a master curve when normalized by the cohesive length scale.
  • Clogging behavior is dictated by the cohesive length scale rather than particle diameter under strong cohesion.

Conclusions:

  • Cohesive forces are a primary driver of clogging in hoppers.
  • The cohesive length scale provides a unifying parameter for clogging phenomena.
  • Findings offer insights for optimizing granular material flow and preventing blockages.