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

• Published in: Chinese journal of chemical engineering Vol. 18; no. 1; pp. 27 - 33
• Main Author: 韩路长 曹杨 吴学文 白鸽 刘跃进
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2010
• Subjects: Bubbles; Chemical engineering; Circulation; Computational fluid dynamics; Eddies; eddy-bubble interaction; Eulerian-Lagrangian; Mathematical models; stirred tank; Tanks; Turbulence; turbulent dispersion; 扩散作用; 搅拌罐; 模型开发; 流通速度; 相互作用时间; stirred tank; eddy-bubble interaction; Eulerian-Lagrangian; turbulent dispersion
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(08)60318-3

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 crossing-eddy 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.