The impact of building surface temperature rise on airflow and cross-contamination around high-rise building

被引:10
作者
Liu, Xiaoping [1 ]
Wu, Xiaojiao [1 ,2 ]
Wu, Mei [1 ]
Shi, Congling [3 ,4 ]
机构
[1] Hefei Univ Technol, Sch Civil Engn, Hefei 230009, Anhui, Peoples R China
[2] First Design & Res Inst MI China Co Ltd, Hefei 230601, Anhui, Peoples R China
[3] China Acad Safety Sci & Technol, Inst Transportat Safety, Beijing, Peoples R China
[4] China Acad Safety Sci & Technol, Beijing Key Lab MFPTS, Beijing, Peoples R China
基金
国家重点研发计划;
关键词
High-rise building; Pollutant; Temperature; Vortex core; Concentration; PEDESTRIAN WIND ENVIRONMENT; POLLUTANT DISPERSION; URBAN-ENVIRONMENT; CFD; INFECTION; RADIATION; RANS;
D O I
10.1007/s11356-020-07671-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This paper numerically studies the characteristics of flow field around a high-rise building and the cross-contamination when the building surface is heated by the solar radiation. Firstly, the normalized concentration K-c is used to evaluate the dispersion characteristics under different source locations without surface temperature rise. Under iso-thermal condition, the near-wall pollutant dispersion features revealed by the predicted results are similar to our previous wind tunnel experiment. Then, the effect of wall surface temperature rise on the cross-contamination and the flow fields is evaluated based on the near-wall concentration distributions and the wake zone vortex core positions, respectively. When the building surface temperature rises, the location of vortex core obviously changes comparing with that under iso-thermal condition. The correction formula for the vortex core location with the leeward wall surface temperature rise below 15 K is developed. The windward wall surface temperature rise brings more serious pollutant accumulation. The near-wall concentrations increase with the rise of temperature when the pollutant is released from the bottom and middle of leeward wall surface, while the top-release scenario exhibited a contrary tendency. For the three interval ranges of generally recognized Richardson number Ri (Ri < 0.1; 0.1 < Ri < 10; Ri > 10), these results indicate that when Ri is less than 0.1, the effect of wall surface temperature rise on near-wall flow and cross-contamination of small-scale model cannot be ignored.
引用
收藏
页码:11855 / 11869
页数:15
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