Microstructure and rheology of rigid rod suspensions

Research output: Research - peer-reviewArticle

Abstract

Nonspherical particles dispersed in a fluid have a tendency to align because of particle-fluid interactions. At high particle concentrations and in the absence of fluid dynamic couples, spontaneous self-alignment can occur due to excluded volume constraints on rotary Brownian motion. This phenomenon prevents a return-to-isotropy from an anisotropic state. In this communication, the low-order moments of the rotary Smoluchowski (S) equation for a rigid rod suspension are used to explore the effect of the Péclet number on the shear viscosity of a suspension. A closure model for the fourth-order orientation tetradic uses an algebraic fully symmetric quadratic (FSQ) mapping of the second-order orientation moment into the fourth-order orientation moment. The algebraic mapping preserves the 6-fold symmetry and the 6-fold contraction properties of the exact fourth-order orientation moment. The theory predicts that, if the orientation director is in the tumbling regime, shear thickening may occur and, if the orientation director is in the wagging regime, shear thinning may occur.

LanguageEnglish (US)
Pages4497-4504
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume54
Issue number16
DOIs
StatePublished - Apr 29 2015
Externally publishedYes

Profile

Rheology
Suspensions
Microstructure
Fluids
Barreling
Peclet number
Shear viscosity
Shear thinning
Brownian movement
Fluid dynamics
Communication

ASJC Scopus subject areas

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

Cite this

Microstructure and rheology of rigid rod suspensions. / Kim, YoChan; Bénard, André; Petty, Charles A.

In: Industrial and Engineering Chemistry Research, Vol. 54, No. 16, 29.04.2015, p. 4497-4504.

Research output: Research - peer-reviewArticle

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