A study of the evolution of nanoparticle dynamics in a homogeneous isotropic turbulence flow via a DNS-TEMOM method  

作　　者：Hong-ye Ma Ming-zhou Yu Han-hui Jin 

机构地区：[1]College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou,310018,China [2]Institute of Fluid Engineering,Zhejiang University,Hangzhou,310027,China

出　　处：《Journal of Hydrodynamics》2020年第6期1091-1099,共9页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the Zhejiang Provincial Natural Science Foundation of China(grant number,LR16A020002);the National Natural Science Foundation of China(grant number,11872353 and 91852102).

摘　　要：In this article,a coupling of the direct numerical simulation(DNS)and the population balance modeling(PBM)is implemented to study the effect of turbulence on nanoparticle dynamics in homogenous isotropic turbulence(HIT).The DNS is implemented based on a pseudo-spectral method and the PBM is implemented using the Taylor-series expansion method of moments.The result verifies that coagulation due to turbulent shear force has a bigger impact on the evolution of number concentration,polydispersity,and average diameter of nanoparticles than Brownian coagulation in the HIT.The Reynolds number plays an important role in determining the number concentration,polydispersity,and average diameter of nanoparticles,and these quantities change more rapidly with an increase of Reynolds number.It is also found that the initial geometric standard deviation slows down the evolution of particle dynamics,but almost has no influence on the polydispersity of nanoparticles.

关 键 词：nanoparticle dynamics TURBULENCE pseudo-spectral method Taylor-series expansion method of moments 

分 类 号：O359[理学—流体力学]