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Article: Dispersion of coughed droplets in a fully-occupied high-speed rail cabin

TitleDispersion of coughed droplets in a fully-occupied high-speed rail cabin
Authors
KeywordsAir supply
Airflow patterns
Cfd simulations
Different boundary condition
Dispersion characteristics
Issue Date2012
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building and Environment, 2012, v. 47, p. 58-66 How to Cite?
AbstractThe dispersion process of respiratory droplets released by coughing of an individual in a high speed rail cabin is studied using CFD simulations. The cabin is fully-occupied by 48 passengers with a seating arrangement of 12 rows and 4 columns. Four cases of different boundary conditions of air supply and exhausts are studied. The droplets dispersion characteristics and the maximum dispersion distances under specified ventilation conditions are studied.All 48 passengers are simulated by relatively realistic three-dimensional thermal manikins. The coughing individual is located on an aisle seat in the seventh row. The duration of a single cough is assumed to be 0.4 s; and a time-dependent coughing velocity profile is used. Within the first 10 s after coughing, a separation phenomenon of the so-called ' old' and ' new' droplets is observed. The ' old' droplets generated in the first 0.2 s escaped from the body plume, and were injected into the lower zone of the cabin. These droplets stayed longer in the lower zone of the cabin. The ' new' droplets generated in the next 0.2 s, had a relatively small velocity, and thus followed the upward body plume, entering directly the upper zone. The luggage rack also has an effect on the airflow patterns in the HSR cabin. The droplets removal ability is stronger when there is a through flow from the front door to back. However, in this situation, the droplets can disperse much further and affect more passengers. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/157141
ISSN
2015 Impact Factor: 3.394
2015 SCImago Journal Rankings: 2.121
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Committee of the Hong Kong SAR GovernmentHKU 714608E
Funding Information:

This project is supported by Research Grant Committee of the Hong Kong SAR Government through Project HKU 714608E:ConnectVent - Ventilation of "connected" indoor environments in controlling airborne disease transmission.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorZhang, Len_US
dc.contributor.authorLi, Yen_US
dc.date.accessioned2012-08-08T08:45:30Z-
dc.date.available2012-08-08T08:45:30Z-
dc.date.issued2012en_US
dc.identifier.citationBuilding and Environment, 2012, v. 47, p. 58-66en_US
dc.identifier.issn0360-1323en_US
dc.identifier.urihttp://hdl.handle.net/10722/157141-
dc.description.abstractThe dispersion process of respiratory droplets released by coughing of an individual in a high speed rail cabin is studied using CFD simulations. The cabin is fully-occupied by 48 passengers with a seating arrangement of 12 rows and 4 columns. Four cases of different boundary conditions of air supply and exhausts are studied. The droplets dispersion characteristics and the maximum dispersion distances under specified ventilation conditions are studied.All 48 passengers are simulated by relatively realistic three-dimensional thermal manikins. The coughing individual is located on an aisle seat in the seventh row. The duration of a single cough is assumed to be 0.4 s; and a time-dependent coughing velocity profile is used. Within the first 10 s after coughing, a separation phenomenon of the so-called ' old' and ' new' droplets is observed. The ' old' droplets generated in the first 0.2 s escaped from the body plume, and were injected into the lower zone of the cabin. These droplets stayed longer in the lower zone of the cabin. The ' new' droplets generated in the next 0.2 s, had a relatively small velocity, and thus followed the upward body plume, entering directly the upper zone. The luggage rack also has an effect on the airflow patterns in the HSR cabin. The droplets removal ability is stronger when there is a through flow from the front door to back. However, in this situation, the droplets can disperse much further and affect more passengers. © 2011 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenven_US
dc.relation.ispartofBuilding and Environmenten_US
dc.subjectAir supplyen_US
dc.subjectAirflow patternsen_US
dc.subjectCfd simulationsen_US
dc.subjectDifferent boundary conditionen_US
dc.subjectDispersion characteristics-
dc.titleDispersion of coughed droplets in a fully-occupied high-speed rail cabinen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y: liyg@hku.hken_US
dc.identifier.authorityLi, Y=rp00151en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.buildenv.2011.03.015en_US
dc.identifier.scopuseid_2-s2.0-80052799719en_US
dc.identifier.hkuros209880-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80052799719&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume47en_US
dc.identifier.spage58en_US
dc.identifier.epage66en_US
dc.identifier.isiWOS:000295662100009-
dc.publisher.placeUnited Kingdomen_US
dc.relation.projectConnectVent - Ventilation of "connected" indoor environments in controlling airborne disease transmission-
dc.identifier.scopusauthoridLi, Y=7502094052en_US
dc.identifier.scopusauthoridZhang, L=36063274500en_US
dc.identifier.citeulike9189599-

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