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 language | English |
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Article number | 118294 |
Number of pages | 14 |
Journal | Chemical Engineering Science |
Volume | 267 |
Early online date | 12 Nov 2022 |
DOIs | |
Publication status | Published - 5 Mar 2023 |
Keywords
- Stirred tanks
- Mixing
- Non-Newtonian
- Transitional
- PTV
- RANS
- CFD