Droplets Sliding Over Shearing Surfaces Studied by Molecular Dynamics

J. J. Derksen*

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Through molecular dynamics, the sliding motion of a liquid drop embedded in another liquid over a substrate as a result of a shear flow is studied. The two immiscible Lennard-Jones liquids have the same density and viscosity. The system is isothermal. Viscosity, surface tension, and static contact angles follow from calibration simulations. Sliding speeds and drop deformations (in terms of dynamic contact angles) are determined as a function of the shear rate. The latter is nondimensionalized as a capillary number (Ca) that has been varied in the range 0.02-0.64. For Ca up to 0.32, sliding speeds are approximately linear in Ca. For larger Ca, very strong droplet deformations are observed. (c) 2015 American Institute of Chemical Engineers.

Original languageEnglish
Pages (from-to)4020-4027
Number of pages8
JournalAIChE Journal
Volume61
Issue number11
Early online date14 Jul 2015
DOIs
Publication statusPublished - Nov 2015

Keywords

  • wetting
  • immiscible liquids
  • surface tension
  • moving contact lines
  • molecular dynamics
  • Lennard-Jones liquid
  • contact-angle
  • spontaneous imbibition
  • solid-surface
  • simulation
  • wettability
  • fluid
  • perspective
  • nanopores
  • systems
  • planar

Cite this