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:
Physics of fluids (Woodbury, N.Y. : 1994)
影响因子:
--
通讯作者:
Lim KH
Lim KH
中科院分区:
其他
文献类型:
--
作者:
Li H;Leong FY;Xu G;Ge Z;Kang CW;Lim KH

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2019冠状病毒病(COVID-19)大流行持续,我们的注意力集中在空气飞沫传播。在这项研究中,我们模拟了在热带室外环境中的咳嗽飞沫的分散,占液滴蒸发的非挥发性成分的影响。研究了相对湿度、风速和社会距离对蒸发液滴输送的影响。传播风险的评估是基于SARS-CoV-2病毒沉积在距离咳嗽者1米或2米的人身上。我们的研究结果表明,在风速为2 m/s的情况下,100 µm的液滴的移动距离可达6.6 m。在干燥条件下可以进一步增加。我们发现,一个小水滴的行程是相对不敏感的相对湿度。对于毫米级的液滴,即使在静止的空气中,投影距离也可以超过1米。与距离咳嗽者2米的身体相比,在距离咳嗽者1米的身体上发现了显著更大的飞沫和病毒沉积。尽管基于单次咳嗽的吸入暴露较低,但感染风险仍可能通过连续咳嗽或较高的病毒载量表现出来。
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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