Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method

CIESC Journal ›› 2010, Vol. 18 ›› Issue (1): 1-9.

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Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method

林建忠^1,2, 林培锋², 于明州¹, 陈华军³

1. China Jiliang University, Hangzhou 310018, China;
2. Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, ZhejiangUniversity, Hangzhou 310027, China;
3. Department of Mechanical Engineering, University of Nevada, Las Vegas, NV 89154 USA

收稿日期:2009-08-23 修回日期:2009-12-28 出版日期:2010-02-28 发布日期:2010-12-30
通讯作者: LIN Jianzhong, E-mail: mecjzlin@public.zju.edu.cn
作者简介:
基金资助:
Supported by the Major Program of the National Natural Science Foundation of China(10632070)

Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method

LIN Jianzhong^1,2, LIN Peifeng², YU Mingzhou¹, CHEN Huajun³

1. China Jiliang University, Hangzhou 310018, China;
2. Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, ZhejiangUniversity, Hangzhou 310027, China;
3. Department of Mechanical Engineering, University of Nevada, Las Vegas, NV 89154 USA

Received:2009-08-23 Revised:2009-12-28 Online:2010-02-28 Published:2010-12-30
Supported by:
Supported by the Major Program of the National Natural Science Foundation of China(10632070)

摘要/Abstract

摘要： Transport of nanoparticles and coagulation is simulated with the combination of CFD in a circular bend. The Taylor-expansion moment method(TEMOM)is employed to study dynamics of nanoparticles with Brownian motion,based on the flow field from numerical simulation.A fully developed flow pattern in the present simulation is compared with previous numerical results for validating the model and computational code.It is found that for the simulated particulate flow system,the particle mass concentration,number concentration,particle polydispersity, mean particle diameter and geometric standard deviation over cross-section increase with time.The distribution of particle mass concentration at different time is independent of the initial particle size.More particles are concentrated at outer edge of the bend.Coagulation plays more important role at initial stage than that in the subsequent period.The increase of Reynolds number and initial particle size leads to the increase of particle number concentration.The particle polydispersity,mean particle diameter and geometric standard deviation increase with decreasing Reynolds number and initial particle size.

关键词: nanoparticle, coagulation, transport, flow in bend, moment method

Abstract: Transport of nanoparticles and coagulation is simulated with the combination of CFD in a circular bend. The Taylor-expansion moment method(TEMOM)is employed to study dynamics of nanoparticles with Brownian motion,based on the flow field from numerical simulation.A fully developed flow pattern in the present simulation is compared with previous numerical results for validating the model and computational code.It is found that for the simulated particulate flow system,the particle mass concentration,number concentration,particle polydispersity, mean particle diameter and geometric standard deviation over cross-section increase with time.The distribution of particle mass concentration at different time is independent of the initial particle size.More particles are concentrated at outer edge of the bend.Coagulation plays more important role at initial stage than that in the subsequent period.The increase of Reynolds number and initial particle size leads to the increase of particle number concentration.The particle polydispersity,mean particle diameter and geometric standard deviation increase with decreasing Reynolds number and initial particle size.

Key words: nanoparticle, coagulation, transport, flow in bend, moment method

林建忠, 林培锋, 于明州, 陈华军. Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method[J]. CIESC Journal, 2010, 18(1): 1-9.

LIN Jianzhong, LIN Peifeng, YU Mingzhou, CHEN Huajun. Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method[J]. , 2010, 18(1): 1-9.

参考文献

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Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method

Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method

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