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

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.

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Abstract

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.

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66 citations in Web of Science®

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ID Code: 25828
Item Type: Journal Article
Additional URLs:
Keywords: Expiratory droplets, Coughing, Speaking, Interferometric Mie imaging, Particle image velocimetry
DOI: 10.1016/j.jaerosci.2008.10.003
ISSN: 0021-8502
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Biological Physics (029901)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Life Sciences
Past > Schools > Mathematical Sciences
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2009 Pergamon-Elsevier Science
Deposited On: 19 Jun 2009 13:54
Last Modified: 01 Mar 2012 00:07

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