Isothermal flow of viscous liquids in corotating twin screw devices
Article first published online: 25 AUG 2004
Copyright © 1980 Society of Plastics Engineers, Inc.
Polymer Engineering & Science
Volume 20, Issue 18, pages 1220–1228, December 1980
How to Cite
Booy, M. L. (1980), Isothermal flow of viscous liquids in corotating twin screw devices. Polym Eng Sci, 20: 1220–1228. doi: 10.1002/pen.760201808
- Issue published online: 25 AUG 2004
- Article first published online: 25 AUG 2004
A mathematical model is derived for isothermal flow of a Newtonian liquid through corotating twin screw equipment. Two different flow regimes are studied. In the first, channels of twin screw equipment are completely filled with liquid, generate a pressure gradient, and provide a discharge pressure at the end of the pump. Equations are given for drag flow rate, pressure backflow rate, and flow rate through the nip zone. It is shown how the analysis of single screw pumps can be modified for twin-screw pumps. In the second regime channels are partly full, which is the case with extraction equipment. Equations show how the degree of fill in the equipment changes with flow rate, speed, and dimensions.