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Non-newtonian viscosity and normal pressure associated with the flow alignment in macromolecular liquids

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  • Hess, Siegfried

Abstract

Non-linear constitutive laws previously obtained within the framework of irreversible thermodynamics are applied to the calculation of the flow alignment and the friction pressure tensor of macromolecular liquids. A non-newtonian viscosity is obtained which decreases with increasing magnitude of the velocity gradient. For rigid molecules it reaches a finite asymptotic value, viz. the second newtonian viscosity. The friction pressure tensor contains normal components. The magnitude of this normal pressure is closely related to the change of the viscosity caused by the velocity gradient. Flow alignment and the pressure tensor are also studied for time-dependent (alternating) velocity gradients.

Suggested Citation

  • Hess, Siegfried, 1977. "Non-newtonian viscosity and normal pressure associated with the flow alignment in macromolecular liquids," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 86(2), pages 383-399.
    • Handle: RePEc:eee:phsmap:v:86:y:1977:i:2:p:383-399
    DOI: 10.1016/0378-4371(77)90036-X
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