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Equations for the interpretation of normal stress differences in polymer solutions and melts

  • M. Soylu
  • R. A. Mashelkar
  • J. Ulbrecht
Chapter

Abstract

Polymer solutions and melts are known to exhibit two types of anomalies, viz. viscous (resulting in shear dependent viscosity under steady flow conditions) and elastic (manifesting in normal stresses under steady flow conditions). An industrial rheologist is faced with the pressing problem of describing such experimentally observed viscous and elastic anomalies in mathematical terms of general utility or specifying in turn explicit constitutive equations with a small number of constants so as to be able to correlate the phenomena satisfactorily. Once such equations are found one hopes to apply these equations directly to the problem of interest. If the problems under consideration are too complicated then one may be able to at least suggest relevant dimensionless groups based on these equations.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1975

Authors and Affiliations

  • M. Soylu
    • 1
  • R. A. Mashelkar
    • 1
  • J. Ulbrecht
    • 1
  1. 1.Department of Chemical EngineeringUniversity of SalfordSalford 5, LancsEngland

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