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| Study on flow characteristics in a stirred tank by large-eddy simulation |
| Received:April 27, 2013 Revised:July 10, 2013 |
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| DOI：10.7511/jslx201405015 |
| KeyWord:stirred tank numerical simulation turbulence structure |
| Author | Institution |
| 刘玉玲 |
西安理工大学 水利水电学院, 西安 |
| 郑艳 |
西安理工大学 水利水电学院, 西安 |
| 魏文礼 |
西安理工大学 水利水电学院, 西安 |
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| Abstract: |
| The gas-liquid two-phase flow equations were solved by the large eddy model to numerically simulate the flow field characteristics in a stirred tank equipped with six-bladed Rushton turbine.The free fluid surface was simulated by the VOF method.The equations were solved by the Simplec method.The complex double vortex flow structures in the stirred tank,the trailing vortex development near the impellers' tips and the flow velocity distribution were obtained.The comparisons of the large eddy simulation and RNG κ-ε model calculated results show that the large eddy model is able to simulate the deve-lopment process of instantaneous vortex flow field,and that the presence of the baffles destroys the flow field in the round stirred tank to improve the mixing efficiency near the blades,and that the turbulence near the blades shows significant anisotropy,and mean velocity shows obvious fluctuations.Thus the reliability of large eddy simulation to explore turbulence phenomena and flow structures in a stirred tank is proved. |