Application of laser Doppler anemometry to measure velocity distribution inside the screw channel of a twin-screw extruder

Mukund V. Karwe, Valentinas Sernas

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

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 com 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.

Original languageEnglish (US)
Pages (from-to)135-152
Number of pages18
JournalJournal of Food Process Engineering
Volume19
Issue number2
DOIs
StatePublished - Jun 1996

All Science Journal Classification (ASJC) codes

  • Food Science
  • Chemical Engineering(all)

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