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Isothermal flow of viscous liquids in corotating twin screw devices
Author(s) -
Booy M. L.
Publication year - 1980
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760201808
Subject(s) - backflow , materials science , mechanics , isothermal process , isothermal flow , volumetric flow rate , drag , flow (mathematics) , pressure gradient , newtonian fluid , thermodynamics , mechanical engineering , open channel flow , physics , inlet , engineering
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.