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J. J. Duffy, A. J. Hill, S. H. Murphy
Simple method for determining stress and strain constants for non-standard measuring systems on a rotational rheometer
Appl. Rheol. 25:4 (2015) 42670 (6 pages)
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There is often a necessity to measure, or at least estimate, true viscosity values using non-standard measuring systems on a
rotational rheometer. This may be to replicate a mixing or manufacturing process on a lab scale, to keep a sample dispersed
and uniform during a measurement or to measure some rheological property that would be difficult or impossible with a
standard configuration. Such measurements can be made easily enough, but without a process for converting torque to
shear stress and angular velocity to shear rate only these raw data variables can be reported. In this paper a simple and novel
empirical method for determining strain/strain rate C1 and stress C2 constants for non-standard measuring systems on a
rotational rheometer is presented. This method uses relative torque measurements made with a Newtonian and
non-Newtonian material and their corresponding power law fitting parameters to determine C1
and C2 using a non-linear regression
analysis. Equilibrium flow curves generated for two non-Newtonian fluids using two non-standard mixing geometries
show very good agreement with data generated using a standard cone and plate configuration, therefore, validating the
approach.
► Cite this publication as follows:
Duffy JJ, Hill AJ, Murphy SH: Simple method for determining stress and strain constants for non-standard measuring systems on a rotational rheometer , Appl. Rheol. 25 (2015) 42670.
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