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Theoretical model for non‐intermeshing twin screw extruders
Author(s) -
Kaplan Aharon,
Tadmor Zehev
Publication year - 1974
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.760140110
Subject(s) - drag , materials science , plastics extrusion , mechanics , extrusion , flow (mathematics) , volumetric flow rate , newtonian fluid , friction factor , mechanical engineering , composite material , engineering , physics , reynolds number , turbulence
A simple theoretical model for flow in nonintermeshing twin screw extruders has been derived. The assumptions which in single screw extruders result in the “two parallel plates” model, in twin screw extruders result in the “three parallel plates” model. The flow rate equation can be expressed, for Newtonian fluids, in terms of drag and pressure flow terms, as in single screw extrusion theory, but each term is multiplied by a geometrical factor. This factor incorporates the effect of one screw on the drag and pressure flow terms of the other. The theoretical model was experimentally verified on a 1 inch diameter Bausano twin screw extruder.