GIEC OpenIR  > 中国科学院广州能源研究所
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
AbstractThis 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)).
KeywordUrban Street Canyon Cfd Buoyancy Flux Thermal Effect Pollutant Dispersion
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
WOS SubjectEnvironmental Sciences
WOS IDWOS:000291629500025
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Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
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.
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