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Mixing and residence time distribution in melt screw extruders
Author(s) -
Pinto G.,
Tadmor Z.
Publication year - 1970
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.760100505
Subject(s) - residence time distribution , mixing (physics) , materials science , plastics extrusion , residence time (fluid dynamics) , distribution (mathematics) , mechanics , flow (mathematics) , plug flow , channel (broadcasting) , mechanical engineering , composite material , mathematics , computer science , mathematical analysis , engineering , physics , geotechnical engineering , computer network , quantum mechanics
The residence time distribution (RTD) functions were derived for screw extruders, based on the “parallel plate” and curved channel flow models. The results indicate a relatively narrow distribution, and they explain several characteristics of screw extruders. The strain distribution in the fluid across the channel was also derived. With the aid of these two functions an average strain of the fluid leaving the extruder was defined. The resulting weighted‐average total strain (WATS) provides a quantitative criterion to the “goodness of mixing” in extruders.