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Article: Size distribution and sites of origin of droplets expelled from the human respiratory tract during expiratory activities

TitleSize distribution and sites of origin of droplets expelled from the human respiratory tract during expiratory activities
Authors
KeywordsEvaporation
Expiratory-aerosol
Human respiratory tract
Hygroscopic
Modality
Size-distribution
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jaerosci
Citation
Journal Of Aerosol Science, 2009, v. 40 n. 3, p. 256-269 How to Cite?
AbstractA 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 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 μm 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 μm. 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 μm, 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 μm, implying that evaporation to the equilibrium droplet size occurred within 0.8 s. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/59010
ISSN
2015 Impact Factor: 2.278
2015 SCImago Journal Rankings: 1.702
ISI Accession Number ID
Funding AgencyGrant Number
ARC DiscoveryDP0558410
Funding Information:

This research was Supported by the ARC Discovery Project DP0558410. We would also like to thank Bob Organ of the QUT School of Physical and Chemical Sciences workshop for his efforts in constructing the EDIS rig.

References

 

DC FieldValueLanguage
dc.contributor.authorMorawska, Len_HK
dc.contributor.authorJohnson, GRen_HK
dc.contributor.authorRistovski, ZDen_HK
dc.contributor.authorHargreaves, Men_HK
dc.contributor.authorMengersen, Ken_HK
dc.contributor.authorCorbett, Sen_HK
dc.contributor.authorChao, CYHen_HK
dc.contributor.authorLi, Yen_HK
dc.contributor.authorKatoshevski, Den_HK
dc.date.accessioned2010-05-31T03:41:21Z-
dc.date.available2010-05-31T03:41:21Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of Aerosol Science, 2009, v. 40 n. 3, p. 256-269en_HK
dc.identifier.issn0021-8502en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59010-
dc.description.abstractA 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 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 μm 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 μm. 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 μm, 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 μm, implying that evaporation to the equilibrium droplet size occurred within 0.8 s. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jaeroscien_HK
dc.relation.ispartofJournal of Aerosol Scienceen_HK
dc.subjectEvaporationen_HK
dc.subjectExpiratory-aerosolen_HK
dc.subjectHuman respiratory tracten_HK
dc.subjectHygroscopicen_HK
dc.subjectModalityen_HK
dc.subjectSize-distributionen_HK
dc.titleSize distribution and sites of origin of droplets expelled from the human respiratory tract during expiratory activitiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0021-8502&volume=40&issue=3&spage=256&epage=269&date=2009&atitle=Size+distribution+and+sites+of+origin+of+droplets+expelled+from+the+human+respiratory+tract+during+expiratory+activities-
dc.identifier.emailLi, Y:liyg@hkucc.hku.hken_HK
dc.identifier.authorityLi, Y=rp00151en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jaerosci.2008.11.002en_HK
dc.identifier.scopuseid_2-s2.0-59849085957en_HK
dc.identifier.hkuros161312en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-59849085957&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume40en_HK
dc.identifier.issue3en_HK
dc.identifier.spage256en_HK
dc.identifier.epage269en_HK
dc.identifier.isiWOS:000264353400006-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridMorawska, L=7004773965en_HK
dc.identifier.scopusauthoridJohnson, GR=7405718469en_HK
dc.identifier.scopusauthoridRistovski, ZD=7004239407en_HK
dc.identifier.scopusauthoridHargreaves, M=7102677780en_HK
dc.identifier.scopusauthoridMengersen, K=6603793565en_HK
dc.identifier.scopusauthoridCorbett, S=7005952289en_HK
dc.identifier.scopusauthoridChao, CYH=13309813600en_HK
dc.identifier.scopusauthoridLi, Y=7502094052en_HK
dc.identifier.scopusauthoridKatoshevski, D=6603832111en_HK

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