Primary Normal Stress Coefficient Predictions
作者:
D. De Kee,
J. Stastna,
期刊:
Journal of Rheology
(AIP Available online 1986)
卷期:
Volume 30,
issue 1
页码: 207-230
ISSN:0148-6055
年代: 1986
DOI:10.1122/1.549889
出版商: The Society of Rheology
数据来源: AIP
摘要:
This paper deals with the problem of evaluating material elasticity through measurements of a material function such as the non‐Newtonian viscosity. A brief summary is provided between relations involving several material functions. In particular, two methods for predicting the primary normal stress coefficient from the steady shear viscosity are examined in detail. These methods are due to Bird, Hassager, and Abdel‐Khalik and to Wagner. Experimental data are presented involving test fluids such as polymethyl methacrylate solutions, polystyrene solutions, and polyacrylamide solutions. Finally, a relation between the shear viscosity and the primary normal stress coefficient is discussed using the concept of the finitely extensible bead‐spring chain model.
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