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Charged particle suspensions exhibit granular flow behavior in narrow channels, forming random clogs. Wider channels allow continuous flow, similar to an hourglass, due to low particle friction.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Colloid Science

Background:

  • Understanding particle flow in confined geometries is crucial for industrial processes.
  • Charged-stabilized suspensions present unique flow dynamics compared to dry granular materials.

Purpose of the Study:

  • To experimentally investigate the flow behavior of charged-stabilized suspensions in a single constricted channel.
  • To compare the observed flow patterns with those of inertial dry granular systems.

Main Methods:

  • Individual particle tracking to monitor suspension flow.
  • Systematic variation of neck-to-particle size ratio (D/d).
  • Analysis of particle volume fraction (ϕ) and clogging event statistics.

Main Results:

  • Clogging occurs randomly via particle arches for D/d < 3, with Poissonian statistics.
  • Continuous, hourglass-like flow is observed for D/d > 3, even at high volume fractions (ϕ ≈ 60%).
  • The transition to uninterrupted flow occurs at a surprisingly small D/d ratio of approximately 3.

Conclusions:

  • Charged-stabilized suspensions exhibit granular-like clogging behavior in narrow constrictions.
  • Low effective friction, due to particle functionalization and lubrication, facilitates continuous flow in wider constrictions.
  • The findings provide insights into the fundamental physics of dense suspension flow and clogging phenomena.