DOI: 10.1016/j.atmosenv.2019.117210
论文题名: Computational Fluid Dynamics modeling of the trace elements dispersion and comparison with measurements in a street canyon with balconies in the city of Patras, Greece
作者: Karkoulias V.A. ; Marazioti P.E. ; Georgiou D.P. ; Maraziotis E.A.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223 语种: 英语
英文关键词: Aerosols
; Apartment houses
; Aspect ratio
; Atmospheric movements
; Computational geometry
; Particle size analysis
; Pollution
; Trace elements
; Vortex flow
; Aerosols particles
; Balconies
; Comparison with measurements
; Computational fluid dynamics modeling
; Computational fluid dynamics simulations
; Street canyon
; Trace element concentrations
; Vertical distribution profiles
; Computational fluid dynamics
; trace element
; aerosol
; air sampling
; comparative study
; computational fluid dynamics
; dispersion
; pollutant transport
; roof
; street canyon
; trace element
; vertical distribution
; aerosol
; air pollutant
; air temperature
; air transportation
; airflow
; atmospheric pressure
; comparative study
; computational fluid dynamics
; controlled study
; diffusion flux
; Greece
; particle size
; particulate matter
; pollution transport
; priority journal
; surface property
; wind speed
; Achaea
; Greece
; Patras
; Western Greece
学科: Aerosols particles
; Balconies
; CFD
; Street canyon
; Trace elements
; Vertical distribution profile
中文摘要: A sampling campaign was conducted within the downtown area of the city of Patras, Greece (Maizonos St.) in a relatively deep city street canyon (of an aspect ratio equal to h/w = 2.33) over the period between November 15, 2004 and February 28, 2005. Aerosol particle samples which were collected at various heights (z/h = 0.10, 0.57, 0.75 and 1.00) on the windward side of a multi-floor apartment building followed by an overall mass and species composition analysis. The results explicitly showed that the mass concentration of the aerosol particles and most trace elements were greater at the street and roof levels compared to the canyon intermediary levels (the 16- and 21-m level data). Thus, it was deduced that the vertical profiles of the traffic related pollutant concentrations don't follow the expected exponential reduction function. The experimental results were confirmed by a Computational Fluid Dynamics (CFD) simulation carried out for the same street canyon geometry by employing the ANSYS-FLUENT commercial suite. In addition, the above CFD results showed that local wind flow and pollutant transport were influenced strongly by the flow vortices generated by the facade roughness elements (balconies). Following a validation process for the ANSYS-FLUENT suite the study was extended to street canyon geometries of different aspect ratios (h/w) and building facade roughness elements (balconies) that generated the corresponding wind flow structures and pollutant transport behaviors. Emphasis was focuses on the formation (number, strength and size) of wind vortices inside the canyon. It was concluded that the vertical gradients of the aerosol particle and trace element concentrations may be attributed to this complex wind flow field. In conclusion, the analysis illuminated the need for high-resolution grids near the source for primary pollutants in urban settings. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160976
Appears in Collections: 气候变化与战略
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作者单位: Nuclear Technology Laboratory, Department of Mechanical Engineering and Aeronautics, University of Patras, Rion-Patras, 26500, Greece; Department of Mechanical Engineering Educators, School of Pedagogical and Technological Education, Heraclion Attikis, 14121, Greece; Thermal Engines Laboratory, Department of Mechanical Engineering and Aeronautics, University of Patras, Rion-Patras, 26500, Greece
Recommended Citation:
Karkoulias V.A.,Marazioti P.E.,Georgiou D.P.,et al. Computational Fluid Dynamics modeling of the trace elements dispersion and comparison with measurements in a street canyon with balconies in the city of Patras, Greece[J]. Atmospheric Environment,2020-01-01,223