Newtonian and non-Newtonian fluid flows in a vessel (T = H = 180 mm) stirred with a Rushton turbine (C = D = T/3) have been simulated in CFD using steady RANS in the transitional regime (183 < Re < 1, 086). 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 k-e model predicted the power numbers closest to expected values and resolved 80 % (at Re = 943) and 89 % (Re = 86) 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.

Romano, M.G., Alberini, F., Liu, L., Simmons, M., Stitt, E.H. (2023). Comparison between RANS and 3D-PTV measurements of Newtonian and non-Newtonian fluid flows in a stirred vessel in the transitional regime. CHEMICAL ENGINEERING SCIENCE, 267, 1-14 [10.1016/j.ces.2022.118294].

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

Alberini, F;
2023

Abstract

Newtonian and non-Newtonian fluid flows in a vessel (T = H = 180 mm) stirred with a Rushton turbine (C = D = T/3) have been simulated in CFD using steady RANS in the transitional regime (183 < Re < 1, 086). 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 k-e model predicted the power numbers closest to expected values and resolved 80 % (at Re = 943) and 89 % (Re = 86) 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.
2023
Romano, M.G., Alberini, F., Liu, L., Simmons, M., Stitt, E.H. (2023). Comparison between RANS and 3D-PTV measurements of Newtonian and non-Newtonian fluid flows in a stirred vessel in the transitional regime. CHEMICAL ENGINEERING SCIENCE, 267, 1-14 [10.1016/j.ces.2022.118294].
Romano, MG; Alberini, F; Liu, L; Simmons, MJH; Stitt, EH
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/939695
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