Impact of aspect ratio and surface heating on pollutant transport in street canyons
- Resource Type
- Academic Journal
- Authors
- Xiaomin Xie; Zhen Huang
- Source
- Journal of Mechanical Science and Technology. 2007-11 21(11):1781-1790
- Subject
- Stress canyon
Aspect ratio
Surface heating
Pollutant transport
Air Exchange Rate(AER)
- Language
- Korean
- ISSN
- 1738-494X
1976-3824
This paper investigated the impacts of surface heating on pollutant transport and Air Exchange Rate (AER) in street canyons of different aspect ratios (building height H to street width W ) using computational fluid dynamic (CFD) technique. Street canyons of H/W varied from 0.1 to 2 were employed in the study. These street-canyon aspect ratios covered a range of basic flow regimes including skimming flow (H/W =1 and 2), wake interference flow (H/W = 0.5), and isolated roughness flow (H/W = 0.1). Different facade/surface heating imposed different influence on the flow field and pollutant transport in street canyons of different H/W. The AER induced by vertical velocity fluctuation AERw" and mean vertical velocity AERw. AER of street canyon with different H/W and different surface heating exhibited their unique characteristics.