摘要
利用计算流体力学(CFD)中多孔介质模型能较好地反映渗透、膜阻力和抽吸压力等特点,在浸没式膜生物反应器(SMBR)中对流体力学问题进行数值模拟,并将结果与壁面模型进行比较分析.模拟结果表明,在相同液相入流速度和曝气速度下,多孔介质模型模拟得到的膜组件内部液相平均流速随着高度升高,先升后降趋势明显,波动少;膜面剪切力和湍动能变化更平稳.相比于壁面模型,结果更接近SMBR实验数据,误差率小,模拟更真实可靠.
Utilizing the porous media model in computational fluid dynamics（CFD） which can better reflect the characteristics of permeability, membrane resistance and suction pressure, this paper numerically simulated the fluid mechanics problem in a SMBR basin as well as compared simulation results with wall model. The simulation results showed that at the same liquid flow rate and aeration rate, the average velocity of the liquid phase in the membrane module simulated by the porous media model had less fluctuation, in addition, increased first and then decreased with height, simultaneously, the membrane shear force and turbulent kinetic energy change more smoothly. Compared with wall model, the results of porous media model are closer to the experiment data and the deviation is smaller, moreover, the simulation is realistic and reliable.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2017年第6期95-101,共7页
Membrane Science and Technology
基金
国家自然科学基金资助项目(51508082)
