DOI: 10.1016/j.atmosenv.2015.01.027
Scopus记录号: 2-s2.0-84921047770
论文题名: A numerical study of diurnally varying surface temperature on flow patterns and pollutant dispersion in street canyons
作者: Tan Z ; , Dong J ; , Xiao Y ; , Tu J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 104 起始页码: 217
结束页码: 227
语种: 英语
英文关键词: Diurnal variation
; Pollutant dispersion
; Street canyon
; Street temperature
Scopus关键词: Atmospheric temperature
; Computer integrated manufacturing
; Heat transfer
; Numerical models
; Pollution
; Rubidium
; Surface properties
; Thermal stratification
; Wall function
; Wind tunnels
; Bulk Richardson number
; Diurnal variation
; Pollutant dispersions
; Stability condition
; Street canyon
; Surface temperatures
; Temperature conditions
; Wind tunnel experiment
; Flow patterns
; airflow
; atmospheric pollution
; flow pattern
; mathematical analysis
; numerical model
; pollutant transport
; Richardson number
; stabilization
; surface temperature
; two-dimensional modeling
; accuracy
; ambient air
; Article
; atmospheric dispersion
; circadian rhythm
; controlled study
; flow
; friction
; heat transfer
; priority journal
; quantitative study
; solar radiation
; sunlight
; surface property
; surface temperature
; temperature
; wind
; Canyon County
; Idaho
; United States
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The impacts of the diurnal variation of surface temperature on street canyon flow pattern and pollutant dispersion are investigated based on a two-dimensional street canyon model under different thermal stratifications. Uneven distributed street temperature conditions and a user-defined wall function representing the heat transfer between the air and the street canyon are integrated into the current numerical model. The prediction accuracy of this model is successfully validated against a published wind tunnel experiment. Then, a series of numerical simulations representing four time scenarios (Morning, Afternoon, Noon and Night) are performed at different Bulk Richardson number (Rb). The results demonstrate that uneven distributed street temperature conditions significantly alters street canyon flow structure and pollutant dispersion characteristics compared with conventional uniform street temperature assumption, especially for the morning event. Moreover, air flow patterns and pollutant dispersion are greatly influenced by diurnal variation of surface temperature under unstable stratification conditions. Furthermore, the residual pollutant in near-ground-zone decreases as Rb increases in noon, afternoon and night events under all studied stability conditions. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81955
Appears in Collections: 气候变化事实与影响
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作者单位: College of Urban Construction and Environmental Engineering, Chongqing University, China; School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Australia
Recommended Citation:
Tan Z,, Dong J,, Xiao Y,et al. A numerical study of diurnally varying surface temperature on flow patterns and pollutant dispersion in street canyons[J]. Atmospheric Environment,2015-01-01,104