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Measurement of velocity profiles in reverse-screw elements of a twin-screw extruder

โœ Scribed by Murali Chandrasekaran; Mukund V. Karwe

Publisher
American Institute of Chemical Engineers
Year
1997
Tongue
English
Weight
833 KB
Volume
43
Category
Article
ISSN
0001-1541

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โœฆ Synopsis

A laser Doppler anemometer was used to measure velocity components for the flow of a Newtonian fluid in a reversing section of a pilot-scale corotating twin-screw extruder. Measurements were made at a fixed axial position in the intemeshing (nip) region and the translational region (away from the nip). Tangential and axial velocity profiles reached a maximum in the middle of the screw channel, indicatingpressure flow. Leakage flow through the gaps between screw flights and backjlow toward the hopper were observed only in the nip region. No reversal of flow was detected in the translational region. Measured velocity profiles showed substantial& higher shear rates in the reversing section of the screw as compared to those in the forward-conveying section.

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