期刊
JOURNAL OF AEROSOL SCIENCE
卷 40, 期 3, 页码 256-269出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jaerosci.2008.11.002
关键词
Expiratory-aerosol; Size-distribution; Hygroscopic; Modality; Evaporation; Human respiratory tract
类别
资金
- ARC Discovery [DP0558410]
A new expiratory droplet investigation system (EDIS) was used to conduct the most comprehensive program of study to date, of the dilution corrected droplet size distributions produced during different respiratory activities. Distinct physiological processes were responsible for specific size distribution modes. The majority of particles for all activities were produced in one or more modes, with diameters below 0.8 mu m at average concentrations up to 0.75 cm(-3). These particles occurred at varying concentrations, during all respiratory activities, including normal breathing. A second mode at 1.8 mu m was produced during all activities, but at lower concentrations of up to 0.14 cm(-3). Speech produced additional particles in modes near 3.5 and 5 mu m. These two modes became most pronounced during sustained vocalization, producing average concentrations of 0.04 and 0.16 cm(-3), respectively, suggesting that the aerosolization of secretions lubricating the vocal chords is a major source of droplets in terms of number. For the entire size range examined of 0.3-20 mu m, average particle number concentrations produced during exhalation ranged from 0.1 cm(-3) for breathing to 1.1 cm(-3) for sustained vocalization. Non-equilibrium droplet evaporation was not detectable for particles between 0.5 and 20 mu m, implying that evaporation to the equilibrium droplet size occurred within 0.8 s. (C) 2008 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据