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APPLICATION of LASER DOPPLER ANEMOMETRY to MEASURE VELOCITY DISTRIBUTION INSIDE the SCREW CHANNEL of A TWIN‐SCREW EXTRUDER
Author(s) -
KARWE MUKUND V.,
SERNAS VALENTINAS
Publication year - 1996
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.1996.tb00386.x
Subject(s) - laser doppler velocimetry , mechanics , jet (fluid) , materials science , plastics extrusion , doppler effect , extrusion , shear (geology) , newtonian fluid , optics , physics , composite material , medicine , blood flow , astronomy
Velocity measurements inside the screw channels of a co‐rotating, self‐wiping twin‐screw extruder (ZSK‐30) have been carried out using the noninvasive technique of Laser Doppler Anemometry. A two‐dimensional Argon‐ion laser Doppler system was used to measure tangential and axial velocity components in one of the screws, away from the intermeshing zone. Heavy corn syrup with naturally occurring particles was used in the extrusion experiments. the measured tangential velocity distribution agreed with the expected distribution for a Newtonian fluid. Measurements also indicated that near the screw root and away from the flights, shear rates were substantially lower as compared to the shear rates near the barrel. the results indicated that this technique is suitable for making velocity measurements in a twin‐screw extruder using model fluids.