SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (4): 679-685.

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Nanoparticle Migration in a Fully Developed Turbulent Pipe Flow Considering the Particle Coagulation

林建忠1,2, 刘淞2, 陈达良3   

  1. 1. China Jiliang University, Hangzhou 310018, China;
    2. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
    3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
  • 收稿日期:2011-04-05 修回日期:2011-11-12 出版日期:2012-08-28 发布日期:2012-09-15
  • 通讯作者: LIN Jianzhong, E-mail:mecjzlin@public.zju.edu.cn
  • 基金资助:
    Supported by the Major Program of the National Natural Science Foundation of China (11132008)

Nanoparticle Migration in a Fully Developed Turbulent Pipe Flow Considering the Particle Coagulation

LIN Jianzhong1,2, LIU Song2, CHAN Tatleung3   

  1. 1. China Jiliang University, Hangzhou 310018, China;
    2. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
    3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
  • Received:2011-04-05 Revised:2011-11-12 Online:2012-08-28 Published:2012-09-15
  • Supported by:
    Supported by the Major Program of the National Natural Science Foundation of China (11132008)

摘要: Numerical simulations of nanoparticle migration in a fully developed turbulent pipe flow are performed.The evolution of particle number concentration,total particle mass,polydispersity,particle diameter and geometric standard deviation is obtained by using a moment method to approximate the particle general dynamic equation.The effects of Schmidt number and Damköhler number on the evolution of the particle parameters are analyzed.The results show that nanoparticles move to the pipe center.The particle number concentration and total particle mass are distributed non-uniformly along the radial direction.In an initially monodisperse particle field,the particle clusters with various sizes will be produced because of coagulation.As time progresses,the particle cluster diameter grows from an initial value at different rates depending on the radial position.The largest particle clusters are found in the pipe center.The particle cluster number concentration and total particle mass decrease with the increase of Schmidt number in the region near the pipe center,and the particles with lower Schmidt number are of many different sizes,i.e.more polydispersity.The particle cluster diameter and geometric standard deviation increase with the increase of Damkhler number at the same radial position.The migration properties for nanosized particles are different from that for microsized particles.

关键词: nanoparticle, coagulation, turbulent, pipe flow

Abstract: Numerical simulations of nanoparticle migration in a fully developed turbulent pipe flow are performed.The evolution of particle number concentration,total particle mass,polydispersity,particle diameter and geometric standard deviation is obtained by using a moment method to approximate the particle general dynamic equation.The effects of Schmidt number and Damköhler number on the evolution of the particle parameters are analyzed.The results show that nanoparticles move to the pipe center.The particle number concentration and total particle mass are distributed non-uniformly along the radial direction.In an initially monodisperse particle field,the particle clusters with various sizes will be produced because of coagulation.As time progresses,the particle cluster diameter grows from an initial value at different rates depending on the radial position.The largest particle clusters are found in the pipe center.The particle cluster number concentration and total particle mass decrease with the increase of Schmidt number in the region near the pipe center,and the particles with lower Schmidt number are of many different sizes,i.e.more polydispersity.The particle cluster diameter and geometric standard deviation increase with the increase of Damkhler number at the same radial position.The migration properties for nanosized particles are different from that for microsized particles.

Key words: nanoparticle, coagulation, turbulent, pipe flow