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DETERMINATION OF EFFECTIVE SHEAR RATES IN ROTATIONAL VISCOMETERS WITH COMPLEX GEOMETRIES
Author(s) -
RAO M. A.,
COOLEY H. J.
Publication year - 1984
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.1984.tb00390.x
Subject(s) - viscometer , impeller , newtonian fluid , viscosity , shear rate , materials science , non newtonian fluid , shear (geology) , apparent viscosity , mechanics , thermodynamics , mathematics , composite material , physics
The effective shear rates of a flag and a star shaped impeller were determined in a jacketed vessel by matching the viscosity of a Newtonian fluid and the apparent viscosity of a non‐Newtonian fluid, and from the slope of a plot of (1–n) versus log (P/K N n+1 d 3 ). The results from the two methods were in good agreement. For geometries with large surface areas, the method of matching viscosities is less likely to contribute to errors.