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3‐D flow effects on residence time distribution in screw extruders
Author(s) -
Chen L.,
Lindt J. T.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690420604
Subject(s) - streamlines, streaklines, and pathlines , residence time distribution , mechanics , flow (mathematics) , residence time (fluid dynamics) , pressure gradient , newtonian fluid , channel (broadcasting) , open channel flow , non newtonian fluid , volumetric flow rate , work (physics) , simulation , materials science , mechanical engineering , engineering , physics , electrical engineering , geotechnical engineering
This work concerns some selected 3‐D flow effects on residence time distribution (RTD) in a screw extruder. The Newtonian problem is emphasized in which the cross‐ and down‐channel flow components can be formally discoupled and treated as two parallel 2‐D problems: our stream‐function‐based analysis of the Newtonian cross‐channel flow was combined with the existing 2‐D solution for the down‐channel flow. The RTD was determined by tracing the streamlines generated from both velocity components for the industrially important cases of fully‐ and partially‐filled channels. The effect of the cross‐channel flow on the RTD is discussed in connection with the stagnation flows, the down‐channel pressure gradient, and the presence of a free surface in a partially‐filled channel. The cross‐channel pressure distribution is compared to the conventional 1‐D theory. The non‐Newtonian effects were assessed using the commercial software POLYCAD.