Rheologica Acta

, Volume 5, Issue 3, pp 184–187 | Cite as

The success of Casson's equation

  • G. W. Scott Blair
Article

Summary

Many diverse materials, including some which are very unlikely to have a structure such as is postulated byCasson, obey his equation for shear-thinning plastic bodies. When the data range over only one or one and a half decades, as is usual, the curves cannot be visually distinguished from those using theHerschel andBulkley equation for which some explanation, depending much less on any specific type of structure, is already available. It also seems probable that the two equations are indistinguishable if both are transformed to allow for small “negative yield-values” in dilatant systems.

Keywords

Polymer Half Decade Plastic Body Diverse Material Dilatant System 

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References

  1. 1).
    Casson, N., Brit. Soc. Rheol. Bull.52, 5 (1957).Google Scholar
  2. 2).
    Casson, N., Rheology of Disperse Systems, Ed.C. C. Mill, p. 84 (1959).Google Scholar
  3. 3).
    Merrill, E. W., W. G. Margetts, G. R. Cokelet, andE. R. Gilliland, 4th Internat. Congr. Rheol. (1963)4, Biorheol. Symp. Ed. A. L. Copley, p. 135 (1965).Google Scholar
  4. 4).
    Scott Blair, G. W., Nature183, 613 (1959).Google Scholar
  5. 5).
    Herschel, W. H. andR. Bulkley, Kolloid-Z.39, 291 (1926).CrossRefGoogle Scholar
  6. 6).
    Herschel, W. H., Kolloid-Z.36, 249 (1925).Google Scholar
  7. 7).
    Scott Blair, G. W., Rheol. Acta4, 53 (1965).CrossRefGoogle Scholar
  8. 8).
    Scott Blair, G. W. andT. H. Prentice, Cah. Groupe franç. Rhéol.,1, (2) 75 (1966).Google Scholar
  9. 9).
    Bantoft, E., Rheology of Disperse Systems, Ed.C. C. Mill, p. 105 (1959).Google Scholar
  10. 10).
    Seidel, P. L., Münch. Abh.11, (3), 81 (1874).Google Scholar
  11. 11).
    Whittaker, E. T. andG. Robinson, Calculus of Observations, 4th Edn., p. 255 (London 1944).Google Scholar
  12. 12).
    Kenney, J. F. andE. S. Keeping, Mathematics of Statistics, Pt. 2, 2nd Edn. p. 330 (New York 1961).Google Scholar
  13. 13).
    Scott Blair, G. W., Kolloid-Z.47, 76 (1929).CrossRefGoogle Scholar
  14. 14).
    Scott Blair, G. W., Kolloid-Z.48, 283 (1929).CrossRefGoogle Scholar
  15. 15).
    Ostwald, Wo., Kolloid-Z.47, 176 (1929).CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag 1966

Authors and Affiliations

  • G. W. Scott Blair
    • 1
  1. 1.National Institute for Research in DairyingShinfield, ReadingEngland

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