Energy dissipation from an extrudate in the gap between the screw rib and the extruder shell

A dimensionless equation is derived for determining the energy dissipation between the screw rib and the sleeve of an extruder for a Newtonian model extrudate. The parameter ranges, within which the pressure at the exit from the screw and some geometrical parameters do not affect the dissipation, are indicated.Moscow Institute of Chemical Engineering. Translated from Mekhanika Polimerov, No. 4, pp. 746–749, July–August, 1972.