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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Colloidal Jamming Dynamics in Microchannel Bottlenecks.

Zenamarkos B Sendekie1,2, Patrice Bacchin1,2

  • 1Laboratoire de Génie Chimique, Université Toulouse III , 118 Route de Narbonne, F-31062 Toulouse, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 21, 2016
PubMed
Summary

Microparticle filtration is influenced by fluid flow and particle interactions. Physicochemical conditions dictate clogging behavior, affecting filter performance and particle aggregation dynamics.

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Area of Science:

  • Colloids and Surfaces
  • Microfluidics
  • Filtration Science

Background:

  • Understanding microparticle behavior in filters is crucial for various industrial and environmental applications.
  • Physicochemical interactions significantly impact filtration efficiency and filter longevity.
  • Microfluidic platforms offer precise control for studying pore-scale phenomena.

Purpose of the Study:

  • To investigate the relationship between hydrodynamic conditions and physicochemical interactions during microparticle filtration.
  • To analyze pore clogging dynamics and permeability changes in microfluidic filters.
  • To elucidate the influence of ionic strength on particle-particle and particle-wall colloidal interactions.

Main Methods:

  • Real-time pore-scale visualization within microfluidic filters.
  • Measurement of flow rate and pressure to monitor filtration dynamics.
  • Flux stepping experiments under varying physicochemical conditions, including different ionic strengths (0.01 mM, 10 mM, 100 mM).

Main Results:

  • Distinct clogging behaviors were observed, influenced by filtration conditions and colloidal interactions.
  • Ionic strength affects clogging: moderate strength leads to delays, while high strength causes fragile aggregates and particle sweeping.
  • An opening angle at the microchannel entrance accelerates clogging, especially when particle repulsion is partially screened.

Conclusions:

  • Clogging dynamics are governed by a balance of hydrodynamic forces and colloidal interactions (repulsion and attraction).
  • Three distinct filtration scenarios (panic, herding, sacrifice) were identified, analogous to crowd swarming, based on ionic strength and particle behavior.
  • The study provides insights into optimizing filtration processes by controlling physicochemical conditions to manage particle aggregation and filter performance.