Gap size and shear history dependencies in shear thickening of a suspension ordered at rest
作者:
M. K. Chow,
C. F. Zukoski,
期刊:
Journal of Rheology
(AIP Available online 1995)
卷期:
Volume 39,
issue 1
页码: 15-32
ISSN:0148-6055
年代: 1995
DOI:10.1122/1.550697
出版商: The Society of Rheology
关键词: SUSPENSIONS;SHEAR PROPERTIES;MELTING;TIME DEPENDENCE;INSTABILITY;DIFFUSION;DEFORMATION
数据来源: AIP
摘要:
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 10−3MKCl which displayed long‐range orientational order at rest. In wide gap rheometers (i.e., tool gaps ≥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 μm. However, the shear rate marking the onset of thickening is a decreasing function of rheometer tool gap for gaps smaller than 15 μm. 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.
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