Dispersion of evaporating cough droplets in tropical outdoor environment.
Dispersion of evaporating cough droplets in tropical outdoor environment.
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DOI:
10.1063/5.0026360
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发表时间:
2020-11-01
期刊:
影响因子:
--
通讯作者:
Lim KH
中科院分区:
文献类型:
--
作者:
Li H;Leong FY;Xu G;Ge Z;Kang CW;Lim KH
The ongoing Covid-19 pandemic has focused our attention on airborne droplet transmission. In this study, we simulate the dispersion of cough droplets in a tropical outdoor environment, accounting for the effects of non-volatile components on droplet evaporation. The effects of relative humidity, wind speed, and social distancing on evaporative droplet transport are investigated. Transmission risks are evaluated based on SARS-CoV-2 viral deposition on a person standing 1 m or 2 m away from the cougher. Our results show that the travel distance for a 100 µm droplet can be up to 6.6 m under a wind speed of 2 m/s. This can be further increased under dry conditions. We found that the travel distance of a small droplet is relatively insensitive to relative humidity. For a millimetric droplet, the projected distance can be more than 1 m, even in still air. Significantly greater droplets and viral deposition are found on a body 1 m away from a cougher, compared to 2 m. Despite low inhalation exposure based on a single cough, infection risks may still manifest through successive coughs or higher viral loadings.
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