Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers

doi:10.1016/j.cjche.2015.09.002

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (11): 1746-1754.DOI: 10.1016/j.cjche.2015.09.002

Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers

Fengling Yang, Shenjie Zhou, Xiaohui An

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

收稿日期:2015-01-15 修回日期:2015-06-27 出版日期:2015-11-28 发布日期:2015-12-18
通讯作者: Fengling Yang
基金资助:
Supported by the National Natural Science Foundation of China (21306105).

Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers

Fengling Yang, Shenjie Zhou, Xiaohui An

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

Received:2015-01-15 Revised:2015-06-27 Online:2015-11-28 Published:2015-12-18
Contact: Fengling Yang
Supported by:
Supported by the National Natural Science Foundation of China (21306105).

摘要/Abstract

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-ε turbulent 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.

关键词: Stirred vessel, Gas-liquid mixing, Dislocated-blade Rushton impeller, Power consumption, Computational fluid dynamics (CFD)

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-ε turbulent 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.

Key words: Stirred vessel, Gas-liquid mixing, Dislocated-blade Rushton impeller, Power consumption, Computational fluid dynamics (CFD)

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.

Fengling Yang, Shenjie Zhou, Xiaohui An. Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers[J]. Chin.J.Chem.Eng., 2015, 23(11): 1746-1754.

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Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers

Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers

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