Numerical investigations of the effects of blade shape on the flow characteristics in a stirred dead-end membrane bioreactor  

作　　者：Xu-qu Hu Xing-yi Wang Xiu-cheng Lei Xiang Qiu Lin-feng Chen 胡徐趣;王星燚;雷秀成;邱翔;陈林烽

机构地区：[1]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University [2]College of Science, Shanghai Institute of Technology [3]School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology

出　　处：《Journal of Hydrodynamics》2018年第6期1143-1152,共10页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nso.11402084,11572203 and 51505136);the Natural Science Foundation of Hunan Province(Grant No.2015JJ3051)

摘　　要：Numerical simulations of turbulent flows in a stirred dead-end membrane bioreactor are performed by using the RNG k-? model based on the finite volume method with the software Fluent. Comparisons of numerical and experimental results confirm the reliability and the feasibility of the constructed model. The flow structures such as the wake flows and the circulation loops in the stirred flows are well simulated. An increase of stirring speed is proposed to minimize the low velocity region. The single vane stirrer is found to be beneficial for biological separations. Results suggest that the increase of the vane number can enhance the mixing effect in the flow domains. However, a circular disk stirrer goes against the formation of vertical circulations. The six-vane stirrer is found to be able to provide a uniform distribution of the high shear stress.Numerical simulations of turbulent flows in a stirred dead-end membrane bioreactor are performed by using the RNG k-? model based on the finite volume method with the software Fluent. Comparisons of numerical and experimental results confirm the reliability and the feasibility of the constructed model. The flow structures such as the wake flows and the circulation loops in the stirred flows are well simulated. An increase of stirring speed is proposed to minimize the low velocity region. The single vane stirrer is found to be beneficial for biological separations. Results suggest that the increase of the vane number can enhance the mixing effect in the flow domains. However, a circular disk stirrer goes against the formation of vertical circulations. The six-vane stirrer is found to be able to provide a uniform distribution of the high shear stress.

关 键 词：Turbulent flow stirred flows membrane fouling membrane bioreactor 

分 类 号：O3[理学—力学]