On the Validity of the Maxwell Model and Related Constitutive Equations; a Study Based on the First Normal Stress Coefficient

1997 ◽  
Vol 7 (12) ◽  
pp. 1523-1533
Author(s):  
H.-P. Wittmann
Keyword(s):  
Normal Stress ◽  
Constitutive Equations ◽  
Maxwell Model ◽  
Stress Coefficient

Normal Stress Coefficient in Solutions of Macromolecules

Nature ◽  
1948 ◽  
Vol 161 (4093) ◽  
pp. 567-568 ◽  
Author(s):  
R. S. RIVLIN
Keyword(s):  
Normal Stress ◽  
Stress Coefficient

Enhancement of the first normal stress coefficient and dynamic moduli during shear thickening of a polymer solution

2003 ◽  
Vol 47 (4) ◽  
pp. 1041-1050 ◽  
Author(s):  
Maria Eugenia Muñoz ◽  
Anton Santamarı́a ◽  
Julio Guzmán ◽  
Evaristo Riande
Keyword(s):  
Polymer Solution ◽  
Normal Stress ◽  
Shear Thickening ◽  
Dynamic Moduli ◽  
Stress Coefficient

The hydrodynamics of non-Newtonian Fluids - III. The normal stress effect in high-polymer solutions

1953 ◽  
Vol 245 (899) ◽  
pp. 399-428 ◽  
Keyword(s):  
Normal Stress ◽  
Phenomenological Theory ◽  
Solution Concentration ◽  
Stress Effect ◽  
Torsional Motion ◽  
Normal Stresses ◽  
Experimental Conditions ◽  
Stress Effects ◽  
Stress Coefficient ◽  
Normal Stress Effect

Normal stress effects arising in the torsional motion of a cylindrical mass of poly iso butylene solution are measured. The precautions which must be taken in making the measurements and the corrections which must be applied to them in order that the results may be compared with theory are discussed in some detail. The distribution of normal stresses over the plane ends of the cylindrical mass and the dependence of this on the experimental conditions is shown to be consistent with the phenomenological theory advanced by Rivlin (1948 a ). From the normal stress measurements, the normal stress coefficient, defined in this theory, is evaluated and the manner in which it depends on velocity gradient is found. Finally, the dependence of the normal stress coefficient on solution concentration and temperature is investigated.

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