Calibration of a Commercial Kneader for Rheological Applications

In the case of some highly viscous fluids, or thick pastes (such as those exhibiting high yield stress and/or high plastic viscosity), neither rotational nor tube type viscometers are suitable for rheological characterisation. Due to their capacity for generating and maintaining high torque or high...

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Bibliographic Details
Published inApplied rheology (Lappersdorf, Germany) Vol. 12; no. 5; pp. 241 - 251
Main Authors Kealy Tim, Tiu Carlos
Format Journal Article
LanguageEnglish
Published De Gruyter 01.10.2002
Subjects
calibration
experimental validation
instrumented kneader
power-law
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Summary:In the case of some highly viscous fluids, or thick pastes (such as those exhibiting high yield stress and/or high plastic viscosity), neither rotational nor tube type viscometers are suitable for rheological characterisation. Due to their capacity for generating and maintaining high torque or high rates of rotation, kneaders and mixers can often engender shear rates in excess of those of conventional rotational viscometers. Often these devices are instrumented, to measure and record the rate of rotation of the mixing blades and the related torque on the shaft turning the blades. The major problem facing users of these mixers lies in data interpretation, specifically in relating rate of rotation and torque data to shear rate and shear stress respectively. If it were possible to obtain such relationships, useful rheological data could be generated with instrumented mixers.
ISSN:1617-8106
DOI:10.1515/arh-2002-0013