Comparison between RANS and 3D-PTV measurements of Newtonian and non-Newtonian fluid flows in a stirred vessel in the transitional regime

M.G. Romano, F. Alberini, L. Liu, M.J.H. Simmons*, E.H. Stitt

*Corresponding author for this work

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Abstract

Newtonian and non-Newtonian fluid flows in a vessel ( mm) stirred with a Rushton turbine () have been simulated in CFD using steady RANS in the transitional regime (). The numerical results have been compared against 3D-PTV measurements. For Newtonian fluids, the different turbulence models predicted the same mean flow, which matched well the experimental velocity data. The standard - model predicted the power numbers closest to expected values and resolved 80 % (at ) and 89 % () of the total energy dissipation. Simulations of the non-Newtonian flows presented challenges. For shear thinning rheology, the simulated mean flow patterns did not correspond to the measured ones. CFD also predicted a higher mean velocity, compared to PTV. For yield stress fluids, the numerical predictions of the cavern boundaries were in reasonably good agreement with the experimental observations
Original languageEnglish
Article number118294
Number of pages14
JournalChemical Engineering Science
Volume267
Early online date12 Nov 2022
DOIs
Publication statusPublished - 5 Mar 2023

Keywords

  • Stirred tanks
  • Mixing
  • Non-Newtonian
  • Transitional
  • PTV
  • RANS
  • CFD

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