Mixing in a Screw Extruder. A Model for Residence Time Distribution and Strain

Abstract

A mathematical model for the two-dimensional flow field of power-law fluids in a screw extruder is developed and used to calculate screw characteristics, residence time distributions, delay times, and a weighted average total strain of fluid elements. The dependence of these variables on fluid properties and operating variables is presented and discussed. Experiments were performed with Newtonian and strongly non-Newtonian fluids which are in very good agreement with the predictions of the theory. © 1974, American Chemical Society. All rights reserved.