Calculation of Velocity Profiles and Viscous Heating Effects in Propellant Extrusion Dies.

摘要

The flow of a propellant dough in capillary and annular dies has been analysed with a finite difference computer program. Velocity profiles have been calculated and the effects of viscous heating at the high extrusion rates used in propellant processing have been investigated. Viscous heating was found to have a dramatic effect, causing considerable rearrangement of velocities in the die. It is suggested that viscous heating reduces extrusion pressures and die swell and it may have a beneficial effect on extrudate surface finish.