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Rheology pp 199-204 | Cite as

Non-Newtonian Viscosity at High Stresses

  • A. Eastwood
  • G. Harrison

Abstract

It has long been established that in polymer melts and solutions the viscosity is a non-linear function of shear rate, the value falling from the ‘Newtonian’ or low-shear-rate limiting value as the shear rate is increased. Attempts to observe directly the non-Newtonian behaviour of simple liquids and lubricants in continuous shear at room temperature have met with little success, however, due principly to the considerable heat generated even in a very thin fluid film at the high shear rates required. Non-Newtonian effects have been observed in oil films under elastohydrodynamic conditions, where the fluid is subject to high pressures, and it has been deduced that these effects occur above a critical shear-stress level of between 1 and 100 MPa, depending on the pressure and the molecular weight of the liquid (Hirst and Moore, 1978).

Keywords

Shear Stress Shear Rate Glass Transition Temperature Apparent Viscosity High Shear Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Blair, S. and Winer, W.O., 1979, Trans.A.S.M.E. J. Lub.Tech., 101: 251–257.CrossRefGoogle Scholar
  2. Eyring, H., 1936, J.Chem.Phys. 4: 283–291.ADSCrossRefGoogle Scholar
  3. Gray, R.W., Harrison, G. and Lamb, J., 1977. Proc.Roy.Soc.Lond. A356: 77–102.ADSGoogle Scholar
  4. Hirst, W. and Moore, A.J., 1978, Proc.Roy.Soc.Lond. A360: 403–425.ADSGoogle Scholar
  5. Plazek, D.J., 1968, J.Polymer Sci. A-2, 6: 621–638.Google Scholar

Copyright information

© Springer Science+Business Media New York 1980

Authors and Affiliations

  • A. Eastwood
    • 1
  • G. Harrison
    • 1
  1. 1.Department of ‘Electronics and Electrical EngineeringGlasgow UniversityGlasgowScotland

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