Experimental and numerical investigations of the RTD in a GEA ConsiGma CTL25 tablet press

T. Forgber*, J. Rehrl, M. Matic, R. Sibanc, R. Sivanesapillai, J. G. Khinast

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A discrete element model (DEM) for the prediction of residence time distributions (RTD) in a tablet press operation is validated. To this end, a Design-of-Experiment (DoE) study was performed on the Courtoy Modul P tablet press, and RTD data was gathered using optical measurement of a tracer for various process conditions. Flowability and compressibility of the powder were measured and used for DEM calibration. DEM predictions for RTD exhibit an overall good agreement with DoE ground truth data. The highest relative error for mean residence time amounted to 10% and was observed for the low mass flow edge case. Further, a detailed investigation of the granular flow was carried out with a focus on dead flow regions and mixing behavior in the feed paddle region.

Original languageEnglish
Article number117507
JournalPowder Technology
Publication statusPublished - Jun 2022


  • Discrete element method (DEM)
  • Residence time distribution (RTD)
  • Simulation
  • Tablet press
  • Validaiton

ASJC Scopus subject areas

  • Chemical Engineering(all)


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