Dimensionless Form of the Double Logarithmic Equation relating Shear Stress to Shear Rate as applied to Slowly Coagulating Milk

Abstract

Ostwald and Auerbach¹ were perhaps the first to point out that, for many colloidal systems, the curve of shear stress (τ) plotted against shear rate (ɣ̇) consists of four parts. At the very lowest shear rates, if there is no yield-value, flow is Newtonian, but this is quickly followed by a region in which log τ is linear with log ɣ̇ (called “Struk-turviskosität”). At a certain shear rate all the structure is broken down and we have a Newtonian region, rather misleadingly called the “Laminarast”, finally followed by a condition of turbulence around the particles called “Strukturturbulenz”.