Abstract
A simple method for correction of the wall-slip effect in a Couette rheometer was derived. The method requires only two series of measurements (two flow curves) performed in two measuring sets of any dimensions, and therefore it may be applied for the results obtained in each rheometer with a standard cup and bob set. The method was checked for experimental data and also verified theoretically for a hypothetical liquid.
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Abbreviations
- H :
-
height of cylinder
- M :
-
torque
- r :
-
distance from axis
- R i ,R 0 :
-
radius of inner and outer cylinder
- R m :
-
average radius defined by Eq. (7)
- u :
-
slip velocity
- \(\dot \gamma \) :
-
shear rate
- \(\dot \gamma '\) :
-
shear rate for no-slip conditions
- ε :
-
Newtonian viscosity
- ω :
-
angular speed
- Ω :
-
angular speed of the rotating cylinder
References
Mooney M (1931) J Rheology 2:210
Schlegel H (1980) Rheol Acta 19:375
Schümmer P, Worthoff RH (1978) Chem Eng Sci 33:759
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Kiljański, T. A method for correction of the wall-slip effect in a Couette rheometer. Rheol Acta 28, 61–64 (1989). https://doi.org/10.1007/BF01354770
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DOI: https://doi.org/10.1007/BF01354770