Numerical simulation of a drying colloidal suspension on a wettable substrate using the lattice Boltzmann method

Yasushi Mino, Chika Tanaka, Hazuki Tanaka, Koichi Nakaso, Kuniaki Gotoh

Research output: Contribution to journalArticlepeer-review

Abstract

A computational method based on the lattice Boltzmann method (LBM) is developed to simulate a drying colloidal suspension on a wettable substrate. In this method, solid particles moving in the fluid are treated with an improved smoothed-profile LBM, and the liquid–vapor system is described by the free-energy LBM. To represent solvent evaporation dominated by density gradients, the density at the boundary of the simulation domain is specified to be lower than the equilibrium vapor density. We simulated the drying of a colloidal suspension on a wettable substrate and found that particles with higher wettability aggregated more slowly, but the aggregation proceeded more significantly. This result can be explained based on capillary interactions (i.e., capillary flotation force and capillary immersion force) between the particles. The proposed method can effectively simulate the particle arrangement process induced by the evaporation of the solvent from a colloidal suspension on a wettable substrate.

Original languageEnglish
Article number118050
JournalChemical Engineering Science
Volume263
DOIs
Publication statusPublished - Dec 14 2022

Keywords

  • Capillary interaction
  • Colloidal particles
  • Drying
  • Lattice Boltzmann method
  • Wettability

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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