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

Characterization of expiration air jets and droplet size distributions immediately at the mouth... 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 μm and it was 16.0 μm for speaking (counting 1–100). The estimated total number of droplets expelled ranged from 947 to 2085 per cough and 112–6720 for speaking. The estimated droplet concentrations for coughing ranged from 2.4 to 5.2 cm −3 per cough and 0.004–0.223 cm −3 for speaking. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Aerosol Science Elsevier

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

Loading next page...
 
/lp/elsevier/characterization-of-expiration-air-jets-and-droplet-size-distributions-JesgzG0Kst
Publisher
Elsevier
Copyright
Copyright © 2008 Elsevier Ltd
ISSN
0021-8502
eISSN
1879-1964
D.O.I.
10.1016/j.jaerosci.2008.10.003
Publisher site
See Article on Publisher Site

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

Journal

Journal of Aerosol ScienceElsevier

Published: Feb 1, 2009

References

  • Thermal mapping of the airways in humans
    McFadden, E.R.; Pichurko, B.M.; Bowman, H.; Ingenito, E.; Burns, S.; Dowling, N.
  • Study on transport characteristics of saliva droplets produced by coughing in a calm indoor environment
    Zhu, S.; Kato, S.; Yang, J.H.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off