González-Neria, IsraelAlonzo-Garcia, AlejandroMartínez-Delgadillo, Sergio A.Mendoza-Escamilla, Víctor X.Yáñez-Varela, Juan AntonioVerdin, Patrick G.Rivadeneyra-Romero, Gabriela2019-07-012019-07-012019-06-06González-Neria I, Alonzo-Garcia A, Martínez-Delgadillo SA, et al., (2019) PIV and dynamic LES of the turbulent stream and mixing induced by a V-grooved blade axial agitator. Chemical Engineering Journal, Volume 374, October 2019, pp. 1138-11521385-8947https://doi.org/10.1016/j.cej.2019.06.033http://dspace.lib.cranfield.ac.uk/handle/1826/14279The hydrodynamic behavior of a turbulent flow and the mixing characteristics generated by a V-grooved axial impeller inside an agitated tank reactor were investigated both experimentally and numerically. Angle resolved Particle Image Velocimetry (PIV) techniques with an angular displacement Δθ = 5° have been applied and two aerodynamic planes along the blades were considered. PIV-based results were compared to those obtained by Large Eddy Simulation (LES), used with the dynamic Smagorinsky-Lilly sub-grid scale (SGS) model. Results showed the existence of distinctive recirculation zones in the aerodynamic planes, and new additional frequencies in the impeller stream, induced by the grooves. A decrease of mixing time of about 11% was obtained experimentally, consequence of the better suction induced by the grooved blades in the early stages of mixing. Mean velocities, vorticity, TKE obtained from LES showed a good agreement with the PIV-based results. The distributions of turbulence dissipation rate ε were similar to those obtained from PIV, however showing high under-predicted magnitudes.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/V-groovesPIVLESTurbulent flowDissipation rateAxial impellerArticle23707949