Thermal Effect on Pollutant Dispersion in an Urban Street Canyon

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	Thermal Effect on Pollutant Dispersion in an Urban Street Canyon
	Wang, P.1; Zhao, D.1; Wang, W.1; Mu, H.2; Cai, G.1; Liao, C.1
刊名	international journal of environmental research
	2011-06-01
卷号	5 期号:3 页码:813-820
关键词	Urban Street Canyon CFD Buoyancy Flux Thermal Effect Pollutant Dispersion
英文摘要	this investigation was carried out to reveal the impact of solar radiation on wind flow structure and pollutant dispersion in an urban street canyon of aspect ratio of one using the computational fluid dynamic (cfd) technique. the simulation results (velocity and concentration data) show that heating from building wall surfaces and ground lead to strong buoyancy forces as the air is heated by the wall surface when receiving direct solar radiation. this thermally induced buoyancy plays a significant role in determining flow fields within street canyon. when the sun shines on the leeward side of the building and the ground, the airflow structure and pollutant dispersion patterns are similar to that without solar radiation, the buoyancy flux adds to the upward advection flux along the wall strengthening the original vortex. when the windward wall is warmer than the air, an upward buoyancy flux opposes the downward advection flux along the wall, and divides the flow structure into two counter-rotating vortices indicating a clockwise top vortex and a reverse lower vortex within the canyon. further, the impact of various temperature differences on the windward heating and different velocities for inlet velocity has been examined. the relative influence of the thermal effect can be estimated by bulk richardson number (r(b)).
WOS标题词	science & technology ; life sciences & biomedicine
类目[WOS]	environmental sciences
研究领域[WOS]	environmental sciences & ecology
关键词[WOS]	air-quality ; wind-tunnel ; flow ; transport ; impact ; exchange ; model
收录类别	SCI
语种	英语
WOS记录号	WOS:000291629500025
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/10333]
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Beijing 100864, Peoples R China 2.Dalian Univ Technol, Key Lab Ocean Energy Utilizat & Energy Conservat, Minist Educ, Dalian, Peoples R China
推荐引用方式 GB/T 7714	Wang, P.,Zhao, D.,Wang, W.,et al. Thermal Effect on Pollutant Dispersion in an Urban Street Canyon[J]. international journal of environmental research,2011,5(3):813-820.
APA	Wang, P.,Zhao, D.,Wang, W.,Mu, H.,Cai, G.,&Liao, C..(2011).Thermal Effect on Pollutant Dispersion in an Urban Street Canyon.international journal of environmental research,5(3),813-820.
MLA	Wang, P.,et al."Thermal Effect on Pollutant Dispersion in an Urban Street Canyon".international journal of environmental research 5.3(2011):813-820.