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Measurement of the shear viscosity using a newly developed GRLDA-viscometer

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Abstract

A two-point laser-Doppler anemometer is used to determine velocity gradients. Measuring additionally the pressure drop in channel flow allows one to use this instrument as a viscometer. This is demonstrated by measuring two polymer solutions as well as water. Besides the velocity gradient, the system also furnishes the velocity as well as velocity fluctuations. For surfactant solutions the sudden increase in these fluctuations go hand-in-hand with the sudden shear thickening reported. This behavior thus seems to be caused by a change in type of flow field (structural turbulence) rather than a change in the rheology of the surfactant solutions.

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Authors and Affiliations

  1. DEGUSSA AG — Wolfgang, Abt. VTC-IM, Hanau, FRG

    A. M. Wunderlich

  2. Universität Erlangen-Nürnberg, Erlangen, FRG

    F. Durst

  3. Lehrstuhl f. Strömungsmechanik, Friedrich-Alexander Universität, Egerlandstr. 13, 8520, Erlangen, FRG

    P. O. Brunn

Authors
  1. A. M. Wunderlich
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  2. P. O. Brunn
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  3. F. Durst
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Additional information

This paper is dedicated to Professor Hanswalter Giesekus on the occasion of his retirement as Editor of Rheologica Acta.

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Wunderlich, A.M., Brunn, P.O. & Durst, F. Measurement of the shear viscosity using a newly developed GRLDA-viscometer. Rheol Acta 28, 473–481 (1989). https://doi.org/10.1007/BF01332918

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  • DOI: https://doi.org/10.1007/BF01332918

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