Characterization of expiration air jets and droplet size distributions immediately at the mouth opening


Autoria(s): Chao, Christopher; Wan, Man Pun; Morawska, Lidia; Johnson, Graham R.; Ristovski, Zoran; Hargreaves, Megan; Mengersen, Kerrie L.; Steve, Corbett; Li, Yuguo; Xie, Xiaojian; Katoshevski, David
Data(s)

2009

Resumo

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m and it was 16.0m for speaking (counting 1 to 100). The estimated total number of droplets expelled ranged from 947 – 2085 per cough and 112 – 6720 for speaking. The estimated droplet concentrations for coughing ranged from 2.4 - 5.2cm-3 per cough and 0.004 – 0.223 cm-3 for speaking.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/25828/

Publicador

Pergamon-Elsevier Science

Relação

http://eprints.qut.edu.au/25828/1/c25828.pdf

DOI:10.1016/j.jaerosci.2008.10.003

Chao, Christopher, Wan, Man Pun, Morawska, Lidia, Johnson, Graham R., Ristovski, Zoran, Hargreaves, Megan, Mengersen, Kerrie L., Steve, Corbett, Li, Yuguo, Xie, Xiaojian, & Katoshevski, David (2009) Characterization of expiration air jets and droplet size distributions immediately at the mouth opening. Journal of Aerosol Science, 40(2), pp. 122-133.

Direitos

Copyright 2009 Pergamon-Elsevier Science

Fonte

Faculty of Science and Technology; School of Life Sciences; Mathematical Sciences; School of Physical & Chemical Sciences

Palavras-Chave #029901 Biological Physics #Expiratory droplets #Coughing #Speaking #Interferometric Mie imaging #Particle image velocimetry
Tipo

Journal Article