| Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers☆ |
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| 作者姓名： | Fengling Yang Shenjie Zhou Xiaohui An |
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| 作者单位： | School of Mechanical Engineering, Shandong University, Jinan 250061, China;
Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (21306105). |
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| 摘 要： | Towards the objective of improving the gas dispersion performance, the dislocated-blade Rushton impeller was applied to the gas–liquid mixing in a baffled stirred vessel. The flow field, gas hold-up, dissolved oxygen, power consumption before and after gassing were studied using the computational fluid dynamics (CFD) technique. Dispersion of gas in the liquid was modelled using the Eulerian–Eulerian approach along with the dispersed k–εturbulent model. Rotation of the impeller was simulated with the multiple reference frame method. A modified drag coefficient which includes the effect of turbulence was used to account for the momentum exchange. The predictions were compared with their counterparts of the standard Rushton impeller and were validated with the experimental results. It is concluded that the dislocated-blade Rushton impeller is superior to the standard Rushton impeller in the gas–liquid mixing operation, and the findings obtained here lay the basis of its application in process industries.
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| 关 键 词： | Stirred vessel Gas-liquid mixing Dislocated-blade Rushton impeller Power consumption Computational fluid dynamics (CFD) |
| 收稿时间： | 2015-01-15 |
Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers |
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| Fengling Yang,Shenjie Zhou,Xiaohui An.Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers[J].Chinese Journal of Chemical Engineering,2015,23(11):1746-1754. |
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| Authors: | Fengling Yang Shenjie Zhou Xiaohui An |
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| Affiliation: | School of Mechanical Engineering, Shandong University, Jinan 250061, China;
Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061, China |
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| Abstract: | Towards the objective of improving the gas dispersion performance, the dislocated-blade Rushton impeller was applied to the gas–liquid mixing in a baffled stirred vessel. The flow field, gas hold-up, dissolved oxygen, power consumption before and after gassing were studied using the computational fluid dynamics (CFD) technique. Dispersion of gas in the liquid was modelled using the Eulerian–Eulerian approach along with the dispersed k–εturbulent model. Rotation of the impeller was simulated with the multiple reference frame method. A modified drag coefficient which includes the effect of turbulence was used to account for the momentum exchange. The predictions were compared with their counterparts of the standard Rushton impeller and were validated with the experimental results. It is concluded that the dislocated-blade Rushton impeller is superior to the standard Rushton impeller in the gas–liquid mixing operation, and the findings obtained here lay the basis of its application in process industries. |
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| Keywords: | Stirred vessel Gas-liquid mixing Dislocated-blade Rushton impel er Power consumption Computational fluid dynamics (CFD) |
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