Characterization of expiration air jets and droplet size distributions immediately at the mouth opening
Characterization of expiration air jets and droplet size distributions immediately at the mouth opening
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DOI：
10.1016/j.jaerosci.2008.10.003
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发表时间：
2009-02-01
影响因子：
4.5
通讯作者：
Katoshevski, D.
中科院分区：
文献类型：
--
作者：
Chao, C. Y. H.;Wan, M. P.;Katoshevski, D.
测量了健康志愿者咳嗽和说话时呼出气液滴的粒径分布和呼气射流的速度。液滴尺寸测量使用干涉米氏成像（IMI）技术，而粒子图像测速（PIV）技术用于测量空气速度。这些技术允许在靠近嘴的地方进行测量，并避免了空气采样损失。咳嗽时平均呼气流速为11.7 m/s，说话时平均呼气流速为3.9 m/s。在实验条件下，蒸发和冷凝效应对测得的液滴尺寸的影响可以忽略不计。咳嗽产生的飞沫的几何平均直径为13.5 μ m，说话产生的飞沫的几何平均直径为16.0 μ m（计数1-100）。每次咳嗽排出的液滴总数估计为947 - 2085，每次说话排出的液滴总数估计为112-6720。咳嗽时的估计液滴浓度范围为每次咳嗽2.4 - 5.2 cm（-3），说话时为0.004-0.223 cm（-3）。(C)2008爱思唯尔有限公司保留所有权利。
Size distributions of expiratory droplets expelled during coughing and speaking and the velocities of the expiration air jets of healthy volunteers were measured. Droplet size was measured using the interferometric Mie imaging (IMI) technique while the particle image velocimetry (PIV) technique was used for measuring air velocity. These techniques allowed measurements in close proximity to the mouth and avoided air sampling losses. The average expiration air velocity was 11.7 m/s for coughing and 3.9 m/s for speaking. Under the experimental setting, evaporation and condensation effects had negligible impact on the measured droplet size. The geometric mean diameter of droplets from coughing was 13.5 mu m and it was 16.0 mu m for speaking (counting 1-100). The estimated total number of droplets expelled ranged from 947 to 2085 per cough and 112-6720 for speaking. The estimated droplet concentrations for coughing ranged from 2.4 to 5.2 cm(-3) per cough and 0.004-0.223 cm(-3) for speaking. (C) 2008 Elsevier Ltd. All rights reserved.