Rheologica Acta

, Volume 29, Issue 3, pp 192–203

The motion of rodlike particles in the pressure-driven flow between two flat plates

  • C. A. Stover
  • C. Cohen
Original Contributions

DOI: 10.1007/BF01331355

Cite this article as:
Stover, C.A. & Cohen, C. Rheol Acta (1990) 29: 192. doi:10.1007/BF01331355

Abstract

The motion of freely suspended rodlike particles has been observed in the pressure-driven flow between the two flat plates of a Hele Shaw flow cell at low Reynolds numbers. Data are reported for rodlike particles with aspect ratios of 12.0 suspended in a Newtonian fluid for gap thickness to particle length ratios of 3, 6, and 20; and for rodlike particles with aspect ratios between 5 and 8 in a non-Newtonian fluid (79.25 wt.% water, 20.2 wt.% glycerine, and 0.55 wt.% polyacrylamide). For the Newtonian fluid, the time-dependent orientation of the particles near and far from walls was shown to be in quantitative agreement with Jeffery's theory for ellipsoids suspended in a simple shear flow if an effective aspect ratio is calculated from the experimental period of rotation. Particles aligned with the flow direction and less than a particle half-length from a wall interacted irreversibly with the wall. For the non-Newtonian fluid, the timedependent orientation far from a wall was shown to be in qualitative agreement with Leal's theory for a second-order fluid; however, particles that were aligned with the flow direction and were near walls did not rotate.

Key words

Rodlikeparticle shearflow Newtonianfluid non-Newtonianfluid wall effect 

Copyright information

© Steinkopff 1990

Authors and Affiliations

  • C. A. Stover
    • 1
  • C. Cohen
    • 1
  1. 1.Department of Chemical Engineering School of Chemical EngineeringCornell UniversityIthacaUSA

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