Study on transport characteristics of saliva droplets produced by coughing in a calm indoor environment
Study on transport characteristics of saliva droplets produced by coughing in a calm indoor environment
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DOI：
10.1016/j.buildenv.2005.06.024
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发表时间：
2006-12-01
影响因子：
7.4
通讯作者：
Yang, Jeong-Hoon
中科院分区：
文献类型：
--
作者：
Zhu, Shengwei;Kato, Shinsuke;Yang, Jeong-Hoon
本文研究了在安静的室内环境中，咳嗽产生的唾液滴的传输特性。对三名受试者进行了研究，结果表明，在每次咳嗽期间，超过6.7毫克的唾液以高达22米/S的速度排出，唾液滴可以流出超过2英寸的距离。此外，还利用拉格朗日方程分析了咳嗽过程中不同直径唾液滴的扩散过程。结果表明，咳嗽时唾液滴的输运特性随尺寸的变化而变化。重力或惯性对30针或更小的液滴的影响可以忽略不计，因为它们的尺寸很小，因此它们的输运主要受室内流场的影响。受重力影响很大的50-200克的液滴，随着流场的减弱而下落。300杜松子酒或更多的液滴更多地受到惯性的影响，而不是重力，因此很难下降。此外，分析结果还表明，空调机与受试者之间的空间关系对雾滴的传输有很大影响。最后，在实验和分析结果的基础上，对咳嗽引起的唾液滴感染进行了检验。(C)2005爱思唯尔有限公司。保留所有权利。
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 22 m/s during each individual cough, and that saliva droplets can travel further than 2 in. 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 Pin 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 gm, which are significantly affected by gravity, fall as the flow-field weakens. Droplets of 300 gin 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. (c) 2005 Elsevier Ltd. All rights reserved.