Dynamics of a spherical colloid at a liquid interface: A lattice Boltzmann study

Harinadha Gidituri, Alois Würger, Kevin Stratford, Juho S. Lintuvuori*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We study the dynamics of a spherical colloidal particle pulled along the fluid-fluid interface using lattice Boltzmann (LB) simulations. We consider an interface with a finite width and include both the effects of the thermodynamics of the interface and the particle wetting, characterized by the contact angle θ between the particle surface and the interface, in addition to the viscosity ratio λ between the two fluids. We characterize the particle dynamics by applying a constant pulling force along the interface and measure both the translational and the rotational dynamics as a function of the contact angle and the viscosity ratio. We observe that the hydrodynamic drag is reduced and the particle rotation is increased when the particle resides more in the low viscosity fluid, in agreement with previous hydrodynamic theories. We also study the case where the particle rotation is suppressed, and find an overall increase of the drag coefficient.

Original languageEnglish
Article number052110
JournalPhysics of Fluids
Volume33
Issue number5
DOIs
Publication statusPublished - 11 May 2021

Keywords

  • Colloidal particle
  • contact angle
  • wetting
  • Lattice-Boltzmann Method (LBM)
  • drag force
  • torque

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