Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Processing parallel-disk viscometry data in the presence of wall slip

  • Leong, Yee-Kwong (School of Mechanical Engineering, The University of Western Australia) ;
  • Campbell, Graeme R. (School of Engineering, James Cook University) ;
  • Yeow, Y. Leong (Department of Chemical and Biomolecular Engineering, The University of Melbourne) ;
  • Withers, John W. (Department of Chemical and Biomolecular Engineering, The University of Melbourne)
  • Published : 2008.06.30
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Abstract

This paper describes a two-step Tikhonov regularization procedure for converting the steady shear data generated by parallel-disk viscometers, in the presence of wall slip, into a shear stress-shear rate function and a wall shear stress-slip velocity functions. If the material under test has a yield stress or a critical wall shear stress below which no slip is observed the method will also provide an estimate of these stresses. Amplification of measurement noise is kept under control by the introduction of two separate regularization parameters and Generalized Cross Validation is used to guide the selection of these parameters. The performance of this procedure is demonstrated by applying it to the parallel disk data of an oil-in-water emulsion, of a foam and of a mayonnaise.

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References

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