Mesoscopic electrohydrodynamic simulations of binary colloidal suspensions
arXiv:1712.08494 · doi:10.1063/1.5020377
Abstract
A model is presented for the solution of electrokinetic phenomena of colloidal suspensions in fluid mixtures. We solve the discrete Boltzmann equation with a BGK collision operator using the lattice Boltzmann method to simulate binary fluid flows. Solvent-solvent and solvent-solute interactions are implemented using a pseudopotential model. The Nernst-Planck equation, describing the kinetics of dissolved ion species, is solved using a finite difference discretization based on the link-flux method. The colloids are resolved on the lattice and coupled to the hydrodynamics and electrokinetics through appropriate boundary conditions. We present the first full integration of these three elements. The model is validated by comparing with known analytic solutions of ionic distributions at fluid interfaces, dielectric droplet deformations and the electrophoretic mobility of colloidal suspensions. Its possibilities are explored by considering various physical systems, such as breakup of charged and neutral droplets and colloidal dynamics at either planar or spherical fluid interfaces.
11 figures, 16 pages
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- Hydrodynamic simulations of sedimenting dilute particle suspensions under repulsive DLVO interactions
- How antagonistic salts cause nematic ordering and behave like diblock copolymers
- Influence of fluid flows on electric double layers in evaporating colloidal sessile droplets