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DOI	10.1016/j.atmosenv.2020.117916
	Numerical study on evolution of ultrafine particles emitted from vehicle exhaust with multi-dynamical behaviors
	Xu G.; Wang J.; Qiao X.
发表日期	2021
ISSN	13522310
卷号	244
英文摘要	In this study, a numerical investigation is performed to simulate the evolution process of ultrafine particles emitted from diesel vehicle exhausts. The Taylor expansion method of moments (TEMOM)-CFD coupled model is primarily applied to the non-spherical particles for simultaneously simulating four kinds of particle dynamical behaviors including coagulation, deposition, condensation and nucleation. Compared with previous simulation studies, the developed model shows closer results to the experimental data. The effects of initial particle number, initial particle size, environmental temperature, relative humidity, fuel sulfur content, and exhaust velocity on the evolution process are systematically analyzed. The results show that the increase rate of the geometric mean diameter (GMD) and the increase margin of GMD are proportional to the initial particle number concentration (PNC) and the environmental temperature. When the relative humidity or the fuel sulfur content is higher, the larger increase margin of the GMD appears, but the increase rate of GMD is not affected obviously. Moreover, the initial PNC gives nearly no contributions to the diffusion range. The initial GMD also shows no markedly effects on the decrease rate of the volume concentration. The fuel sulfur content could affect the PNC distribution in a larger region of the flow field, while the environmental relative humidity and temperature have no evident effects on the distribution range of the PNC. © 2020 Elsevier Ltd
英文关键词	Coagulation; Condensation; Deposition; Diesel vehicle; Non-spherical particles; Nucleation
语种	英语
scopus关键词	Computational fluid dynamics; Fuels; Method of moments; Particle size; Diesel vehicle exhaust; Environmental temperature; Geometric mean diameters; Nonspherical particle; Numerical investigations; Particle number concentration; Relative humidity and temperatures; Taylor expansion method; Sulfur; diesel fuel; sulfuric acid; computational fluid dynamics; concentration (composition); condensation; diameter; exhaust emission; nucleation; numerical model; particle size; particulate matter; relative humidity; sulfur; aerosol; Article; atmospheric particulate matter; chemical composition; concentration (parameter); diffusion; diffusion coefficient; eddy diffusivity; environmental temperature; exhaust gas; humidity; mathematical model; molecular weight; motor vehicle; particle size; physical parameters; plume; priority journal; quantitative study; turbulent flow; ultrafine particulate matter; vapor pressure; water vapor; wind speed
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144870
作者单位	School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
推荐引用方式 GB/T 7714	Xu G.,Wang J.,Qiao X.. Numerical study on evolution of ultrafine particles emitted from vehicle exhaust with multi-dynamical behaviors[J],2021,244.
APA	Xu G.,Wang J.,&Qiao X..(2021).Numerical study on evolution of ultrafine particles emitted from vehicle exhaust with multi-dynamical behaviors.Atmospheric Environment,244.
MLA	Xu G.,et al."Numerical study on evolution of ultrafine particles emitted from vehicle exhaust with multi-dynamical behaviors".Atmospheric Environment 244(2021).