多相流和湍流模型对平板膜生物反应器模拟的影响

doi:10.3969/j.issn.0438-1157.2014.z1.061

化工学报 ›› 2014, Vol. 65 ›› Issue (S1): 377-385.DOI: 10.3969/j.issn.0438-1157.2014.z1.061

• 催化、动力学与反应器 • 上一篇下一篇

多相流和湍流模型对平板膜生物反应器模拟的影响

郁达伟¹, 魏源送¹, 郑祥², 樊耀波¹, Wei Ding³

1. 中国科学院生态环境研究中心, 北京 100085;
2. 中国人民大学环境学院, 北京 100872;
3. Technische Universit't Dresden, Freistaat Sachsen Dresden 01069

收稿日期:2013-06-01 修回日期:2013-12-16 出版日期:2014-05-30 发布日期:2014-05-30
通讯作者: 魏源送
基金资助:
国家水体污染控制与治理科技重大专项（2012ZX07202-002）；国家自然科学基金项目（51278483）；环境模拟与污染控制国家重点联合实验室（环境水质学实验室）平台启动课题“计算流体力学（CFD）及其在膜生物反应器技术创新中的应用研究”。

Impact of multiphase and turbulence models on hydrodynamics simulation of commercial flat-sheet MBR

YU Dawei¹, WEI Yuansong¹, ZHENG Xiang², FAN Yaobo¹, WEI Ding³

1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
2. School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China;
3. Technische Universit't Dresden, Freistaat Sachsen Dresden 01069

Received:2013-06-01 Revised:2013-12-16 Online:2014-05-30 Published:2014-05-30
Supported by:
supported by the National Natural Science Foundation of China(51278483).

摘要/Abstract

摘要： 相分布和速度场是浸没式MBR的流体力学特征的核心，这些特征能够通过CFD的多相流模型和湍流模型低成本、高精度地分析。因此，针对浸没式MBR优化结构、缓解膜污染和降低能耗的需求，以MBR流场的快速准确模拟为目标，以国内外3家主要商用浸没式平板MBR为对象，比较了不同多相流、湍流模型对浸没式平板MBR流场、相分布和计算成本的影响，并进行了模拟验证。结果表明，3家国内外浸没式平板MBR的空间构型多根据厂家推荐值设计，其长宽比为1.37±0.63，高径比为0.97±0.23。商用平板MBR的模拟与验证结果表明：①多相流模型对相分布、流场和速度分布的影响比湍流模型更显著，且VOF模型与standard k-ε的模型组合可更为快速准确地模拟浸没式平板MBR的流场特征；②多相流模型选择是计算成本至关重要的影响因素。6核计算时，VOF模型的CPU 时间为mixture模型的5.5~3.2倍，realizable k-ε的CPU 时间为standard k-ε的1.0~1.1倍。

关键词: 平板膜生物反应器, 计算流体力学, 多相流, 湍流模型, 实验验证

Abstract: Phase distribution and velocity field sketch out hydrodynamics characteristics of flat-sheet MBR (membrane bioreactor), which could be analyzed by multiphase and turbulence models efficiently. Aiming at structure optimization, fouling mitigation and energy reduction for MBR, flat-sheet membranes of three major domestic and abroad companies, including Kubota, Toray and SINAP, were chosen to investigate spatial structure of commercial submerged flat-sheet MBR, and to compare effects of different multiphase and turbulence models on phase distribution, velocity field and computational expense. Results showed that the spatial structure of all three flat-sheet membrane was usually designed according to company's manuals, resulting that ratios of length/width and height/diameter were in the range of 1.37±0.63 and 0.97±0.23, respectively. Multiphase model plays key roles rather than turbulence models in phase distribution and velocity field simulation, and the combination of VOF (volume of fluid) and standard k-ε is more accurate and faster for simulating velocity field of submerged flat-sheet MBR. Multiphase model is the key factor of affecting computational costs. On 6 cores platform, VOF consumes 4.5-2.2 times more CPU time than mixture, and realizable k-ε consumes almost the same time as standard k-ε.

Key words: flat-sheet membrane bioreactors, computational fluid dynamics, multiphase flow, turbulence model, experimental validation

中图分类号:

X703.1

郁达伟, 魏源送, 郑祥, 樊耀波, Wei Ding. 多相流和湍流模型对平板膜生物反应器模拟的影响[J]. 化工学报, 2014, 65(S1): 377-385.

YU Dawei, WEI Yuansong, ZHENG Xiang, FAN Yaobo, WEI Ding. Impact of multiphase and turbulence models on hydrodynamics simulation of commercial flat-sheet MBR[J]. CIESC Journal, 2014, 65(S1): 377-385.

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多相流和湍流模型对平板膜生物反应器模拟的影响

Impact of multiphase and turbulence models on hydrodynamics simulation of commercial flat-sheet MBR

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