A mathematical model, using dimensionless terms, was developed to describe the behavior of power law fluids in a back extrusion (annular pumping) device. A graph and a table were prepared to determine rheological properties from experimental data. Expressions to calculate shear stress and shear rate at the plunger wall were obtained. The model was experimentally validated by comparing values obtained with the back extrusion device to those obtained with a concentric cylinder viscometer.
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Osorio et al. (1987) studied this question.
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