Gap size and shear history dependencies in shear thickening of a suspension ordered at rest

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Journal of Rheology; (United States)

DOI:https://doi.org/10.1122/1.550697· OSTI ID:7065202

Chow, M K; Zukoski, C F ^[1]

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1. Department of Chemical Engineering, University of Illinois, Urbana, Illinois 61801 (United States)

An investigation is made of the flow properties of a suspension of uniform 197 nm diameter spheres at a volume fraction of 0.50 dialyzed to equilibrium against 10[sup [minus]3] [ital M] KCl which displayed long-range orientational order at rest. In wide gap rheometers (i.e., tool gaps [ge]0.5 mm), microstructures and flow properties are similar to those seen in many suspensions which are ordered at rest. Low shear rate response is found to be independent of rheometer tool gap down to 4.5 [mu]m. However, the shear rate marking the onset of thickening is a decreasing function of rheometer tool gap for gaps smaller than 15 [mu]m. These results are consistent with abrupt shear thickening seen in dense suspensions containing uniform particles arising from the formation of percolating clusters produced during shear melting.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 7065202
• Journal Information: Journal of Rheology; (United States), Journal Name: Journal of Rheology; (United States) Vol. 39:1; ISSN JORHD2; ISSN 0148-6055
• Country of Publication: United States
• Language: English

Related Subjects

661300* -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DEFORMATION
DIFFUSION
DISPERSIONS
INSTABILITY
MECHANICAL PROPERTIES
MELTING
PHASE TRANSFORMATIONS
SHEAR PROPERTIES
SUSPENSIONS
TIME DEPENDENCE