Probing the air flow within the wake downwind of a building by means of a tracer technique |
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| Authors: | P J Drivas F H Shair |
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| Affiliation: | 1. Center for Molecular Biology and Genetic Engineering (CBMEG), State University of Campinas — UNICAMP, Campinas, Brazil;2. Department of Genetics, Evolution and Bioagents, State University of Campinas — UNICAMP, Campinas, Brazil;3. Institute Butantan, São Paulo, Brazil;4. Center of Natural and Human Sciences, Federal University of ABC, Santo André, Brazil;5. Department of Molecular Biology and Pharmacology, University of São Francisco, Bragança Paulista, Brazil |
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| Abstract: | Sulfur hexafluoride, an inert, gaseous tracer detected by means of electron-capture gas chromatography, was used to probe the air flow within the wake downwind of a 12m high, three-story building. A reverse-flow circulation was observed with a longitudinal extent downwind of about three building heights; the extent of the recirculation on the roof was confined to less than one-half the width of the building from the downwind edge. The recirculating velocities in the wake were estimated to be about 0.1–0.3 those of the prevailing wind at the top of the building. The wake downwind of the building was found to be well-mixed in all three dimensions and exhibited a characteristic exponential dilution time of approximately 1 min. Some practical contamination problems relating to the wake were also examined, including direct infiltration of the tracer into the building. |
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