THE FLOW PATTERNS OF BUBBLE PLUME IN AN MBBR

• Published in: Journal of hydrodynamics. Series B Vol. 23; no. 4; pp. 510 - 515
• Main Authors: LI, Shi-rong, CHENG, Wen, WANG, Meng, CHEN, Chen
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.08.2011; Springer Singapore; Key Laboratory of Northwest Water Resources and Environmental Ecology of Ministry of Education, Xi'an University of Technology, Xi'an 710048, China; Oil Production Plant of No.4 Changqing Oilfield Company, China National Petroleum Corporation, Jing Bian 718500, China%Key Laboratory of Northwest Water Resources and Environmental Ecology of Ministry of Education, Xi'an University of Technology, Xi'an 710048, China
• Subjects: bubble plume; Bubbles; Engineering; Engineering Fluid Dynamics; flow pattern; Fluid dynamics; Fluid flow; Hydrology/Water Resources; MBBR; Numerical and Computational Physics; Particle Image Velocimetry (PIV); Plumes; Recursive Cross Correlation (RCC); Simulation; Turbulence; Turbulent flow; Unsteady; 不稳定结构; 时间序列; 气液两相流; 泡沫柱; 流模式; 移动床生物膜反应器; 粒子图像测速; Particle Image Velocimetry (PIV); bubble plume; Recursive Cross Correlation (RCC); flow pattern; Particle Image Velocimetry(PIV); Recursive Cross Correlation(RCC)
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(10)60143-6

The flow patterns of the gas-liquid two-phase flow in a Moving-Bed Biofilm Reactor (MBBR) have a critical effect upon the mass transfer by the convection. Bubble plumes promote unsteadily fluctuating two-phase flows during the aeration. This article studies the unsteady structure of bubble plumes through experiments. The time-serial bubble plume images in various cases of the tank are analyzed. The Recursive Cross Correlation-Particle Image Velocimetry (RCC-PIV) is used to calculate the velocities in those cases, and then the time-serial vortex, the total turbulence intensity, the time-serial streamline are obtained. It is shown that the aspect ratio and the void fraction are the dominant factors influencing the unsteady structure of bubble plumes. When the aspect ratio is unity and the void fraction is high, the bubble plumes see a symmetrical vortex structure with a long residence time, which is beneficial for optimizing the aeration system and enhancing the applied range of bubble plumes.