多孔介质模型在SMBR中模拟应用研究
|
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.
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.
引文
[1]Buetehorn S,Volmering D,Vossenkaul K,et al.CFD simulation of single-and multi-phase flows through submerged membrane units with irregular fiber arrangement[J].J Membr Sci,2011,384(1):184-197.
[2]张宇,吴志超,藏莉莉,等.CFD在平板膜MBR设计及运行优化中的研究[J].环境工程学报,2016,10(2):735-741.
[3]Brannock M,Wang Y,Shane C.Mixing characterization of full-scale membrane bioreactor:CFD modeling with experimental validation[J].Water Res,2010,44(10):3181-3191.
[4]Amini E,Mehrnia M R,Mousavi S M,et al.Experimental study and computational fluid dynamics simulation of a full-scale membrane bioreactor for municipal wastewater treatment application[J].Ind Eng Chem Res,2013,52(29):9930-9939.
[5]Cui Z F,Wright K L T.Flux enhancement with gas sparging in downwards crossflow ultrafiltration performance and mechanism[J].J Membr Sci,1996,117(1/2):109-116.
[6]Chang S,Fane A G.The effect of fibre diameter on filtration and flux distribution-relevance to submerged hollow fibre modules[J].J Membr Sci,2001,184(2):221
[7]于艳,樊耀波,徐国良,等.计算流体力学对膜生物反应器水力学特征的模拟研究[J].膜科学与技术,2011,31(4):9-16.
[8]Mehrnia,M R.Khalili-Garakani A,Mostoufi,N,et al.Analyze and control fouling in an airlift membrane bioreactor:CFD simulation and experimental studies[J].Process Biochem,2011,46(5):1138-1145.
[9]Yang M,Yu D,Liu M,et al.Optimization of MBR hydrodynamics for cake layer fouling control through CFD simulation and RSM design[J].Biores Technol,2017,227:102-111.
[10]ANSYS Inc.ANSYS FLUENT User's Guide[Z]//Pittsburgh:ANSYS Inc,2011.
[11]Leslie G,Wang Y,Cox S,et al.CFD simulations of membrane filtration zone in a submerged hollow fibre membrane bioreactor using aporous media approach[J].J Membr Sci,2010,363(1):57-66.
[12]欧特尔H,朱自强,李宗,等.普朗特流体力学基础[M]//北京:科学出版社,2008.
[13]李海峰,吴冀川,刘建波,等.有限元网格剖分与网格质量判定指标[J].中国机械工程,2012,23(3):368-377.
[14]Fimbres-Weihs G A,Wiley D E.Review of 3D CFD modeling of flow and mass transfer in narrow spacerfilled channels in membrane modules[J].Chem Eng Proc:Proc Intensif,2010,49(7):759-781.
[15]Li W,Yu K,Liu B,et al.Computational fluid dynamics simulation of hydrodynamics and chemical reaction in a CFB downer[J].Powd Technol,2015,269:425-436.
[16]Rios N,Nopens I,Vanrolleghem P A.Hydrodynamic CFD simulation of a two-phase flow in a single tube of an ultrafiltration membrane for a side-stream membrane bioreactor[A].WA National Young Water Professionals Conference,Germany,2007,22(10):2434-2443.
[17]Yeo A P S,Law A W K,Fane A G.Factors affecting the performance of a submerged hollow fiber bundle[J].J Membr Sci,2006,280(1):969-982.
[18]崔海航,刘珺芳.基于污染物临界粘附力的超滤动态过程的CFD模拟[J].环境科学学报,2016,36(10):36-42.
[19]Akita K,Okazaki T,Koyama H.Gas hold-ups and friction factors of gas-liquid two-phase flow in an airlift bubble column[J].J Chem Eng Jpn,1988,21(5):476-482.
[20]Kaya R,Deveci G,Turken T,et al.Analysis of wallshear stress on the outside-in type hollow fiber membrane modules by CFD simulation[J].Desalination,2014,351:109-119.
[21]Jankhah S,Berube P R.Power induced by bubbles of different sizes and frequencies on to hollow fibers in submerged membrane systems[J].Water Res,2013,47(17):6516-6526.
[22]Breuer M.A challenging test case for large eddy simulation:high Reynolds number circular cylinder flow[J].Heat Fluids Flow,2000,21(5):648-654.
[23]端木玉,万德成.雷诺数为3900时三维圆柱绕流的大涡模拟[J].海洋工程,2016,34(6):11-20.
[2]张宇,吴志超,藏莉莉,等.CFD在平板膜MBR设计及运行优化中的研究[J].环境工程学报,2016,10(2):735-741.
[3]Brannock M,Wang Y,Shane C.Mixing characterization of full-scale membrane bioreactor:CFD modeling with experimental validation[J].Water Res,2010,44(10):3181-3191.
[4]Amini E,Mehrnia M R,Mousavi S M,et al.Experimental study and computational fluid dynamics simulation of a full-scale membrane bioreactor for municipal wastewater treatment application[J].Ind Eng Chem Res,2013,52(29):9930-9939.
[5]Cui Z F,Wright K L T.Flux enhancement with gas sparging in downwards crossflow ultrafiltration performance and mechanism[J].J Membr Sci,1996,117(1/2):109-116.
[6]Chang S,Fane A G.The effect of fibre diameter on filtration and flux distribution-relevance to submerged hollow fibre modules[J].J Membr Sci,2001,184(2):221
[7]于艳,樊耀波,徐国良,等.计算流体力学对膜生物反应器水力学特征的模拟研究[J].膜科学与技术,2011,31(4):9-16.
[8]Mehrnia,M R.Khalili-Garakani A,Mostoufi,N,et al.Analyze and control fouling in an airlift membrane bioreactor:CFD simulation and experimental studies[J].Process Biochem,2011,46(5):1138-1145.
[9]Yang M,Yu D,Liu M,et al.Optimization of MBR hydrodynamics for cake layer fouling control through CFD simulation and RSM design[J].Biores Technol,2017,227:102-111.
[10]ANSYS Inc.ANSYS FLUENT User's Guide[Z]//Pittsburgh:ANSYS Inc,2011.
[11]Leslie G,Wang Y,Cox S,et al.CFD simulations of membrane filtration zone in a submerged hollow fibre membrane bioreactor using aporous media approach[J].J Membr Sci,2010,363(1):57-66.
[12]欧特尔H,朱自强,李宗,等.普朗特流体力学基础[M]//北京:科学出版社,2008.
[13]李海峰,吴冀川,刘建波,等.有限元网格剖分与网格质量判定指标[J].中国机械工程,2012,23(3):368-377.
[14]Fimbres-Weihs G A,Wiley D E.Review of 3D CFD modeling of flow and mass transfer in narrow spacerfilled channels in membrane modules[J].Chem Eng Proc:Proc Intensif,2010,49(7):759-781.
[15]Li W,Yu K,Liu B,et al.Computational fluid dynamics simulation of hydrodynamics and chemical reaction in a CFB downer[J].Powd Technol,2015,269:425-436.
[16]Rios N,Nopens I,Vanrolleghem P A.Hydrodynamic CFD simulation of a two-phase flow in a single tube of an ultrafiltration membrane for a side-stream membrane bioreactor[A].WA National Young Water Professionals Conference,Germany,2007,22(10):2434-2443.
[17]Yeo A P S,Law A W K,Fane A G.Factors affecting the performance of a submerged hollow fiber bundle[J].J Membr Sci,2006,280(1):969-982.
[18]崔海航,刘珺芳.基于污染物临界粘附力的超滤动态过程的CFD模拟[J].环境科学学报,2016,36(10):36-42.
[19]Akita K,Okazaki T,Koyama H.Gas hold-ups and friction factors of gas-liquid two-phase flow in an airlift bubble column[J].J Chem Eng Jpn,1988,21(5):476-482.
[20]Kaya R,Deveci G,Turken T,et al.Analysis of wallshear stress on the outside-in type hollow fiber membrane modules by CFD simulation[J].Desalination,2014,351:109-119.
[21]Jankhah S,Berube P R.Power induced by bubbles of different sizes and frequencies on to hollow fibers in submerged membrane systems[J].Water Res,2013,47(17):6516-6526.
[22]Breuer M.A challenging test case for large eddy simulation:high Reynolds number circular cylinder flow[J].Heat Fluids Flow,2000,21(5):648-654.
[23]端木玉,万德成.雷诺数为3900时三维圆柱绕流的大涡模拟[J].海洋工程,2016,34(6):11-20.