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Area of Science:

  • Colloid science
  • Fluid dynamics
  • Filtration technology

Background:

  • Particle deposition and clogging are critical in filtration and industrial processes.
  • Existing research often focuses on pore obstruction, not the subsequent particle accumulation.

Purpose of the Study:

  • To investigate the dynamics and structural features of particle accumulation following pore obstruction.
  • To determine the influence of confinement, ionic strength, and flow conditions on accumulation permeability and particle volume fraction.

Main Methods:

  • Experimental analysis of colloidal suspension flow in constrictions.
  • Varying confinement dimensions, ionic strength, and flow rates.
  • Characterization of particle accumulation structure and flow behavior.

Main Results:

  • High confinement leads to irreversible particle deposition, controlling accumulation structure and Darcy flow, regardless of other conditions.
  • Ionic strength and flow conditions have a lesser impact in high confinement scenarios.
  • Particles in the accumulation are fluid-supported and form a dense suspension of repulsive hard spheres, unlike the cohesive clog head.

Conclusions:

  • Confinement is the dominant factor in particle accumulation structure and flow in constricted channels.
  • The accumulation forms a distinct structure from the clog head, characterized by fluid-supported, repulsive particles.
  • Understanding these dynamics is crucial for optimizing filtration and managing fouling processes.