Effect of the diameter of falling balls on the apparent viscosity of suspensions of spheres and rods

W. J. Milliken, L. A. Mondy, M. Gottlieb, A. L. Graham, R. L. Powell

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29 Scopus citations

Abstract

Neutrally buoyant, non-colloidal suspensions of spheres and rods are studied using falling-ball rheometry. The apparent viscosity of each suspension, calculated according to Stokes's law and corrected for effects due to the cylindrical boundaries of the experimental apparatus, is measured as a function of the volume fraction of particles, φ, and the diameter of the falling ball, d. The apparent viscosities of suspensions of spheres having φ ≤ 0.55 are found to be independent of the ratio of d to the diameter of the suspended sphere, ds, in the range 1.0 ≤ d/ds ≤ 6.0. In suspensions of rods of aspect ratio 19.83 and diameter, dr, of 1.596 mm, the apparent viscosity is independent of d when d/dr is greater than approximately 6.

Original languageEnglish
Pages (from-to)341-355
Number of pages15
JournalPCH. Physicochemical hydrodynamics
Volume11
Issue number3
StatePublished - 1 Dec 1989
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (all)

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