A New Concept in Generalizing Non-Newtonian Fluid Flow Data

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Abstract
Many non-Newtonian steady-state flow curves are characterized by the existence of initial and ultimate Newtonian flow regions. A study of such flow patterns leads to the conclusion that the principle flow parameter is the rate of energy input (shear stress times shear rate) rather than either of these used independently. It is postulated that the logarithm of the viscosity is normally distributed between the limits of the first and second Newtonian regions when referred to the logarithm of the rate of energy input. This permits the flow data to be expressed as a straight-line relationship over the full flow range. Application of this technique is made to known polymer-solvent systems to demonstrate its validity. This permits the predictive extension of data from a minimum of experimental data.