Rheology pp 601-606 | Cite as

Flow Behaviour of Lubricants in Service Conditions

  • Kurt Kirschke


In application lubricants are exposed to high rates of shear. As a result of their high content of additives of different kind, including high polymers, they can show a non-Newtonian rheological behaviour in hydrodynamic and elastohydrodynamic (EHD) lubrication. In viscometry with standard viscometers under low rates of shear, this anomalous flow behaviour does not appear. These lubricants can, therefore, become effective in bearing and gear application with another viscosity than is measured in viscometry. In addition to this, other flow effects can occur. The rheology of the lubricants certainly determines its behaviour in the hydrodynamic and elastohydrodynamic regimes. For this reason suitable rheological properties are a principle demand.


Shear Rate High Polymer Viscosity Index Hydrodynamic Lubrication Newtonian Theory 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Kurt Kirschke
    • 1
  1. 1.Fachgruppe 5.2 “Rheologie und Tribologie”Bundesanstalt für MaterialprüfungBerlin 45Germany

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