Flow Field and its Flowability in a Stirred Tank with a Plate Propeller

Abstract:

The flow field produced by a plate propeller in a fully baffled flat bottomed cylindrical stirred tank with the diameter of 300 mm was measured using phase doppler particle analyzer. The radial distributions of the time-averaged, fluctuation velocity and turbulent kinetic energy were analyzed. The effects of off-bottom clearance and baffle on the flow field were investigated. The results showed that the fluctuation velocity and turbulent kinetic energy increased with increasing off-bottom clearance in the impeller region; meanwhile, the maximum values of the time-averaged and fluctuation velocity moved to the center of the stirred tank. The maximum axial velocity decreased with increasing off-bottom clearance in the bulk flow. The turbulent kinetic energy was higher in the impeller region. The maximum value of the turbulent kinetic energy increased with increasing off-bottom clearance and occurred near the end of the impeller. The baffle hindered the tangential velocity and exerted strong influence on the turbulent kinetic energy. The flow field in front of the baffle reflected the distribution of the turbulent kinetic energy in the impeller region.

• Periodical: Advanced Materials Research (Volumes 781-784)
• Pages: 2817-2822
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.781-784.2817
• Online since: September 2013
• Authors: Yong Bin Lai, Ya Li Sun, Yi Jun Zhou, Kun Li, Jun Feng Shu, Bo Wang, Xiu Chen
• Keywords: Flow Field, Flowability, Phase Doppler Particle Analyzer, Plate Propeller, Stirred Tank

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