The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks

CIESC Journal ›› 2010, Vol. 18 ›› Issue (1): 27-33.

The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks

韩路长, 曹杨, 吴学文, 白鸽, 刘跃进

College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China

收稿日期:2009-02-12 修回日期:2009-11-26 出版日期:2010-02-28 发布日期:2010-12-30
通讯作者: HAN Luchang, E-mail: happy-929@163.com
作者简介:
基金资助:
Supported by the National Natural Science Foundation of China(20776121);the Scientific Fund of Hunan Provincial Education Department(07C765,07C744)

The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks

HAN Luchang, CAO Yang, WU Xuewen, BAI Ge, LIU Yuejin

College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China

Received:2009-02-12 Revised:2009-11-26 Online:2010-02-28 Published:2010-12-30
Supported by:
Supported by the National Natural Science Foundation of China(20776121);the Scientific Fund of Hunan Provincial Education Department(07C765,07C744)

摘要/Abstract

摘要： Based on trajectory equations of gas bubble,an eddy-bubble interaction(EBI)model was developed. This model considered the effect of non-drag forces and took the eddy-bubble interaction time as the refreshing time scale of turbulent fluctuations.The relationship between the crossingeddy time and the eddy lifetime was discussed,and the predicted distributions of radial,axial velocities of bubbles and gas holdup were also given. Compared with eddy lifetime(EL)model,the EBI model gives somewhat smaller axial velocity in the upper circulation region and larger velocity in the lower circulation region,causing that fewer bubbles reach the lower circulation region and gas holdup becomes higher in the upper circulation region.The predicted gas holdup by the EBI model approaches closer to the experimental data in the discharge stream region.

关键词: eddy-bubble interaction, turbulent dispersion, stirred tank, Eulerian-Lagrangian

Abstract: Based on trajectory equations of gas bubble,an eddy-bubble interaction(EBI)model was developed. This model considered the effect of non-drag forces and took the eddy-bubble interaction time as the refreshing time scale of turbulent fluctuations.The relationship between the crossingeddy time and the eddy lifetime was discussed,and the predicted distributions of radial,axial velocities of bubbles and gas holdup were also given. Compared with eddy lifetime(EL)model,the EBI model gives somewhat smaller axial velocity in the upper circulation region and larger velocity in the lower circulation region,causing that fewer bubbles reach the lower circulation region and gas holdup becomes higher in the upper circulation region.The predicted gas holdup by the EBI model approaches closer to the experimental data in the discharge stream region.

Key words: eddy-bubble interaction, turbulent dispersion, stirred tank, Eulerian-Lagrangian

韩路长, 曹杨, 吴学文, 白鸽, 刘跃进. The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks[J]. CIESC Journal, 2010, 18(1): 27-33.

HAN Luchang, CAO Yang, WU Xuewen, BAI Ge, LIU Yuejin. The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks[J]. , 2010, 18(1): 27-33.

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The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks

The Effect of Eddy-bubble Interaction Model on the Turbulent Dispersion of Gas Bubbles in Stirred Tanks

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