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Shear induced periodic structure changes in concentrated alumina suspensions at constant shear rate monitored by FBRM

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Abstract

Concentrated aqueous suspensions of alumina as disperse phase show a particular non-Newtonian time dependent flow behavior. The apparent viscosity measured by means of a rotational viscometer with coaxial cylinders at constant shear rate oscillates with time. The period of the oscillations varies on a scale of several hundred seconds. It is assumed that this behavior is caused by shear induced self-organized structure changes. In order to detect structure changes during the shear process a particle analysis system based on the focused beam reflectance measurement (FBRM) technique was applied. We have found a significant correlation between the oscillations of the viscosity and alterations of the chord length distribution.

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Acknowledgment

This research was supported by the Deutsche Forschungsgemeinschaft through the Grant SFB 285 “Particle Technology”. We thank J. Worlitschek (Lasentec/Mettler-Toledo) for helpful discussions.

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  1. Freiberg University of Mining and Technology, Institute of Physical Chemistry, Leipziger Str. 29, 09596, Freiberg, Germany

    Frank Bagusat, Bodo Böhme, Peter Schiller & Hans-Jörg Mögel

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  1. Frank Bagusat
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  2. Bodo Böhme
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  3. Peter Schiller
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  4. Hans-Jörg Mögel
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Correspondence to Frank Bagusat.

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Bagusat, F., Böhme, B., Schiller, P. et al. Shear induced periodic structure changes in concentrated alumina suspensions at constant shear rate monitored by FBRM. Rheol Acta 44, 313–318 (2005). https://doi.org/10.1007/s00397-004-0412-5

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  • DOI: https://doi.org/10.1007/s00397-004-0412-5

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