Zdzisław Jaworski
Czasopismo Techniczne, Chemia Zeszyt 2-Ch (24) 2014 , 2014, s. 115 - 123
The paper present the results of numerical simulations performed for a stirred tank equipped with a PMT type impeller, filled up with a Newtonian fluid. The effects of the grid density and mesh quality and also of the simulation mode on the modelling of fluid flow in a stirred tank were studied. The results are compared with literature data obtained from LDA measurements. It was found that denser numerical grids give more detailed information about generated flow field near the impeller blades. Additionally, better compatibility of predicting and experimental results was obtained in the case of the transient mode simulation, what also demonstrates a significant effect of the angular position of the impeller against baffles on the generated velocity field.
Zdzisław Jaworski
Czasopismo Techniczne, Chemia Zeszyt 2-Ch (24) 2014 , 2014, s. 125 - 134
The paper presents the results of Particle Image Velocimetry (PIV) measurements of the velocity field of a Newtonian fluid in a mixing tank equipped with a PMT type impeller. The results are presented in the form of the velocity vectors, profiles and maps and compared with available data in the literature for the corresponding system, obtained from Laser Doppler Anemometry (LDA) measurements. A good qualitative agreement of the results was found. In the flow one primary and two secondary circulation loops were observed. The PMT type impeller produced a typical axial-radial circulation of the liquid in the vessel. The value of the circulation flow number, KC, was calculated.