Determining local residence time distributions in twin-screw extruder elements via smoothed particle hydrodynamics

Hannes Bauer, Josip Matic, Rachel C. Evans, Andreas Gryczke, William Ketterhagen, Kushal Sinha, Johannes Khinast*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Complex flow patterns in twin-screw extruder (TSE) elements lead to a variability in residence times in the equipment. Changes in the Residence Time Distribution (RTD) depend on the processing conditions and can have a major impact on the product quality. While the RTDs of entire TSE processes can easily be determined via experiment, local RTDs (LRTDs) in sections of fully filled zones are difficult to measure experimentally. In this work, we propose an alternative in-silico method based on Smoothed Particle Hydrodynamics (SPH). We simulated five geometrically different screw elements and investigated how their local RTDs varied with the screw speed, throughput and screw length. Furthermore, in-silico tracer experiments provided insights into the underlying flow mechanisms and the resulting RTDs. Good agreement with experimental results confirms the validity of our approach.

Original languageEnglish
Article number117029
JournalChemical Engineering Science
Volume247
DOIs
Publication statusPublished - 16 Jan 2022

Keywords

  • Hot Melt Extrusion
  • HME
  • Twin-screw extruder element
  • TSE
  • Smoothed particle hydrodynamics
  • SPH
  • Residence time distribution
  • RTD

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering

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