Numerical Investigation of The Effect of Impeller Blade Angle for Stirred Tank

Authors : Dogan Engin ALNAK, Ferhat KOCA, Yeliz ALNAK

Pages : 397-409

Doi:10.16984/saufenbilder.992396

View : 20 | Download : 7

Publication Date : 2022-04-30

Article Type : Research Paper

Abstract :In this study, the most widely used Rushton turbine in the industry was discussed, and the effect of different blade angles on the mixture was investigated numerically. As a standard model, 6 bladed propellers were used and 4 baffles were placed in the stirred tank. The selected tank model is in the form of a flat bottom cylindrical container. Flow characteristics were obtained by giving angles insert ignore into journalissuearticles values(10°, 20°, 30°, 40°, 50°, 60°); to the propeller blades used in the straight model. The obtained results were compared with each other. In addition, analyzes were repeated at different rotation speeds insert ignore into journalissuearticles values(600 rpm, 750 rpm, 1000 rpm); for each model at each angle. ANSYS Fluent 18 commercial software, which is the most preferred CFD program in the literature, was used for this numerical study. The analyzes were provided in the standard k-epsilon insert ignore into journalissuearticles values(ε); turbulence model. The Multiple Reference Frame insert ignore into journalissuearticles values(MRF); approach was used to simulate impeller rotation. The velocity profiles obtained from the simulations have been shown to be in consistent with the experimental estimates and the results of previous studies. As a result, it has been revealed that the best mixing balance is provided by the impeller blade at 40 and 50 degrees.
Keywords : Stirred tank, agitator, propeller design, computational fluid mechanics, k epsilon turbulence model