Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 34, Issue 11, Pages 2811-2822Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-017-0208-9
Keywords
Uncovered Unbaffled Agitated Tank; Numerical Simulation; Computational Fluid Dynamics (CFD); Pitched Blade Turbine; Free Surface Vortex
Funding
- Key Scientific Research Project of Sichuan Provincial Education Department [15ZA0107]
- National Key Research and Development Project of China [2016YFC1100801]
- State Key Laboratory of Chemical Engineering [SKL-Che-16D02]
- Fundamental Research Funds for the Central Universities
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Computational fluid dynamics (CFD) simulations were applied for evaluating the hydrodynamics characteristics in an uncovered unbaffled tank agitated by pitched blade turbines. A volume of fluid (VOF) method along with a Reynolds stress model (RSM) was used to capture the gas-liquid interface and the turbulence flow in the tank. The reliability and accuracy of the simulations are verified. The simulation results show that the vortex can be divided into central zone and peripheral zone, and flow field in the tank can be divided into forced vortex flow region and free vortex flow region. With the increase of impeller speed, the vortex becomes deeper, while the critical radius of the two zones keeps almost unchanged. The impeller clearance and the rotational direction have little effect on the vortex shape. The vortex becomes deeper with increasing of the impeller diameter or the blade angles at the same rotational speed. Power number is little influenced by the impeller speed, and decreases by about 30% when impeller diameter varies from 0.25T to 0.5T. When blade angle varies from 30A degrees to 90A degrees, power number increases by about 2.32-times. Power number in uncovered unbaffled tank is much smaller than that in baffled tank, but is very close to that in a covered unbaffled tank. The discrepancy of power number in uncovered unbaffled tank and that in covered unbaffled tank is less than 10%.
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