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Issue 6, 2011
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Correlations between local flow mechanism and macroscopic rheology in concentrated suspensions under oscillatory shear

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Abstract

An optical visualization apparatus has been designed to measure the particle velocity of concentrated particle suspensions in a stress controlled rheometer equipped with a quartz parallel-plate. Suspensions with high and low matrix viscosity were used to investigate the nonlinear rheology and the local flow mechanism, as well as the correlations between particle velocity profiles and transition behaviors. Herein, it is shown that the sedimentation has great effects on the flow behavior of suspensions and on the particle velocity profiles. Local flow behaviors e.g. shear banding, drift in the center position of oscillatory shear and dynamic wall slip, have been studied comprehensively. By Fourier-transform rheology (FTR) analysis, the shear banding phenomenon is proved to be strongly linked with the nonlinear rheology of suspensions.

Graphical abstract: Correlations between local flow mechanism and macroscopic rheology in concentrated suspensions under oscillatory shear

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Publication details

The article was received on 13 Sep 2010, accepted on 21 Dec 2010 and first published on 04 Feb 2011


Article type: Paper
DOI: 10.1039/C0SM00970A
Citation: Soft Matter, 2011,7, 2433-2443
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    Correlations between local flow mechanism and macroscopic rheology in concentrated suspensions under oscillatory shear

    Y. Guo, W. Yu, Y. Xu and C. Zhou, Soft Matter, 2011, 7, 2433
    DOI: 10.1039/C0SM00970A

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