Large scale dynamic simulation of plate-like particle suspensions. Part II: Brownian simulation

Qingjun Meng, Jonathan J.L. Higdon

Research output: Contribution to journalArticle

Abstract

Rheology and microstructure of plate-like particle suspensions in linear shear flows are studied through Stokesian dynamics simulations with Brownian motion for a range of volume fraction φ up to 0.30 and Peclet number Pe ranging from 0.01 to 104. As in Part I [Meng and Higdon, J. Rheol. 52, 1 (2008)], particles are modeled as planar assemblages of spheres. The effects of Brownian motion on the suspensions microstructure are studied with special attention to two ordering mechanisms observed for non-Brownian systems: (1) the formation of sliding planes of aligned layers of particles and (2) the formation of transient stacks of plate-like particles which move as rigid assemblies. At low Pe, strong Brownian motion yields random particle orientations, however the aligned particle layers are recovered at Pe as low as 0.1 for low φ and 0.4 for φ=0.30. Brownian motion acts more effectively in disrupting particle stacks with measurable reduction in stack formation up to Pe of 1000. The plate-like particle suspensions exhibit both shear thinning and shear thickening behavior as a function of Pe, however, the Pe dependence differs from that for suspensions of spheres. The effect of Brownian motion on particle alignment introduces an additional factor enhancing shear thinning, and the shear thickening is weaker than for suspensions of spheres.

Original languageEnglish (US)
Pages (from-to)37-65
Number of pages29
JournalJournal of Rheology
Volume52
Issue number1
DOIs
StatePublished - Jan 14 2008

Keywords

  • Brownian dynamics
  • Microstructure
  • Ordering
  • Plate-like particles
  • Stokesian dynamics
  • Suspension rheology

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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