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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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