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Particulate suspension coating of capillary tubes.

D-H Jeong1, L Xing1, J-B Boutin1

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This study investigates particle suspension displacement in capillary tubes, revealing three distinct coating regimes (liquid-only, heterogeneous, thick films) based on speed and particle properties. Effective viscosity predicts film thickness, but particle migration alters results in concentrated suspensions.

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Area of Science:

  • Fluid dynamics
  • Colloid and surface science
  • Materials science

Background:

  • Particle suspension displacement in capillaries is crucial for applications like water purification and microplastic dispersion.
  • The impact of dispersed particles on interfacial dynamics and residual liquid film properties is not well understood.

Purpose of the Study:

  • To investigate the deposition of coating films on capillary tube walls during suspension plug translation.
  • To identify deposition regimes and characterize coating film thickness as a function of key parameters.

Main Methods:

  • Experimental study of suspension plug translation in a capillary tube driven by air.
  • Characterization of coating film thickness and composition.
  • Analysis of particle size, volume fraction, and translation speed effects.

Main Results:

  • Three distinct coating regimes were identified: liquid-only, heterogeneous, and thick films.
  • Film thickness, for films thicker than particle diameter, can be predicted by the suspension's effective viscosity.
  • Shear-induced migration in concentrated suspensions leads to variations in volume fraction, affecting film thickness and composition.

Conclusions:

  • Particle presence significantly influences capillary coating dynamics and film properties.
  • Effective viscosity is a useful predictor for film thickness, but particle migration effects must be considered for concentrated systems.
  • Understanding these mechanisms is vital for optimizing industrial processes involving particle suspensions.