Collect. Czech. Chem. Commun. 1988, 53, 957-969

Turbulent flow chracteristics for pitched blade turbine

Zdzisław Jaworskia, Ivan Fořtb and Fryderyk Stręka

a Department of Chemical Engineering and Physical Chemistry, Technical University of Szczecin, 71065 Szczecin, Poland
b Department of Chemical and Food Process Equipment Design, Czech Technical University, 166 07 Prague 6, Czechoslovakia


Measurements of the velocity of a stirred liquid in turbulent flow were performed for the area surrounding a pitched blade turbine. A cylindrical tank equipped with four standard baffles and the stirrer was used in the study. A number of traces of tracer particles were photographed and used to determine instantaneous values of the radial and axial components of the liquid local velocity. Those values were employed to estimate local values of the radial and axial components of the mean and fluctuating velocities. Analysis of the radial distribution of the fluctuating velocity components revealed the existence of the local isotropy of those components for the entire investigated area upstream and downstream the stirrer. Moreover, the homogeneity of turbulence in the stream entering the stirrer and in the induced stream can be assumed. The discharge stream showed an approximate homogeneous turbulence of intensity over 2 times higher than that for the other streams.