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Study on transport characteristics of saliva droplets produced by coughing in a calm indoor environment

机译：在安静的室内环境中咳嗽产生的唾液飞沫的传输特性研究

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In this paper, the transport characteristics of saliva droplets produced by coughing are examined in a calm indoor environment. Three subjects are studied, with results indicating that more than 6.7 mg of saliva is expelled at speeds of up to 22m/s during each individual cough, and that saliva droplets can travel further than 2 m. In addition, the dispersion processes of saliva droplets of different diameters expelled during coughing are analyzed using the Lagrangian equation. The results indicate that the transport characteristics of saliva droplets due to coughing change with size. The effects of gravity or inertia on droplets of 30 μm or less are negligible due to their small sizes, and therefore their transport is mostly influenced by the indoor flow field. Droplets of 50-200 μm, which are significantly affected by gravity, fall as the flow-field weakens. Droplets of 300 μm or more, which are affected more by inertia than gravity, fall difficultly. Moreover, the analytical results also indicate that the droplets' transport is greatly influenced by the spatial relationship between the air-conditioner and the subjects. Finally, based on the experimental and analytical results, droplet infection by saliva droplets due to coughing is examined.
机译：本文研究了在安静的室内环境中咳嗽产生的唾液飞沫的传输特性。研究了三名受试者，结果表明在每次咳嗽期间，以高达22m / s的速度排出超过6.7 mg的唾液，并且唾液飞沫可能传播超过2 m。此外，使用拉格朗日方程分析了咳嗽期间排出的不同直径唾液液滴的分散过程。结果表明，咳嗽引起的唾液飞沫的运输特性随大小而变化。由于液滴尺寸小，重力或惯性对30μm或更小的液滴的影响可忽略不计，因此，其传输主要受室内流场的影响。随着流场的减弱，受重力影响很大的50-200μm的液滴会掉落。受惯性比重力影响更大的300μm或更多的液滴很难掉落。此外，分析结果还表明，空调器与对象之间的空间关系极大地影响了液滴的传输。最后，根据实验和分析结果，检查了由于咳嗽引起的唾液飞沫对飞沫的感染。

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