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Size distribution and sites of origin of droplets expelled during expiratory activities

Morawska, Lidia, Johnson, Graham, Ristovski, Zoran, Hargreaves, Megan, Mengersen, Kerrie L., Corbett, Steve, Chao, Christopher, Li, Yuguo, & Katoshevski, David (2009) Size distribution and sites of origin of droplets expelled during expiratory activities. Journal of Aerosol Science, 40(3), pp. 256-269.

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Abstract

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 µm. That mode occurred during all respiratory activities, including normal breathing. A second mode at 1.8 µm was produced during all activities, but at lower concentrations.-----

Speech produced particles in modes near 3.5 µm and 5 µm. The modes became most pronounced during continuous vocalization, suggesting that the aerosolization of secretions lubricating the vocal chords is a major source of droplets in terms of number.-----

Non-eqilibrium droplet evaporation was not detectable for particles between 0.5 and 20 μm implying that evaporation to the equilibrium droplet size occurred within 0.8 s.

Impact and interest:

67 citations in Scopus
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50 citations in Web of Science®

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ID Code: 25835
Item Type: Journal Article
Additional URLs:
Keywords: expiratory-aerosol, size-distribution, hygroscopic, modality, evaporation
DOI: 10.1016/j.jaerosci.2008.11.002
ISSN: 0021-8502
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Physical Sciences not elsewhere classified (029999)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Aerosols (040101)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Biological Physics (029901)
Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > MICROBIOLOGY (060500) > Microbiology not elsewhere classified (060599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2009 Elsevier
Deposited On: 22 Jun 2009 09:34
Last Modified: 01 Mar 2012 00:07

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