Method of Modelling the Flow of a Propellant Dough in a Single Kneading Disc of aTwin Screw Mix-Extruder

摘要

A simplified method of modelling 2 dimensional flow of propellant doughs in akneading disc of a twin screw mix-extruder (SME) has been developed. The 2-dimensional model is a first step in the development of a full 3 dimensional model of flow in screws and kneading blocks in SMEs. The model is based on the FAN method of Tadmor as modified by Szydlowski et al, and it aims to use less computational effort than alternative models based on finite element analyses. Apart from one model for non-Newtonian fluids, which has several serious flaws, the existing models have assumed that the viscosity of the fluid was Newtonian. The model presented here gives a better method of calculating the flow of non-Newtonian fluids than the previous method, and it produces more realistic flow velocity profiles. Keywords: Australia, Solid propellants, Mathematical models, Computerized simulation. (RWJ)