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Article: Dispersion and settling characteristics of evaporating droplets in ventilated room

TitleDispersion and settling characteristics of evaporating droplets in ventilated room
Authors
KeywordsCFD
Drift-flux model
Droplet dispersion
Evaporating droplet
Ventilation
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building And Environment, 2007, v. 42 n. 2, p. 1011-1017 How to Cite?
Abstract
Movement and evaporation of small droplets in the room air are investigated in this paper through CFD simulations. A modified drift-flux model is presented with the droplet evaporation rate and the drift velocity expressed as simple algebra functions of droplet diameter, which is integrated in the transport equations of droplet number density and droplet bulk density. Evaporating droplets are treated as a continuum phase with one way coupling with the carrier phase, i.e. air. Our numerical simulations reveal that the distribution of the large evaporating droplets in the ventilated room air is characterized by a combination of the settling feature when droplets are first generated and released and the dispersion feature after the droplets are evaporated to be either very fine or become droplet nuclei. For droplets less than 50 μm in diameter, the dispersion feature is dominant in the test room that we simulated, while for droplets larger than 100 μm in diameter, the settling feature dominates. For evaporating droplets between these two sizes, the spatial distribution of droplets tends to be located at the lower part of the test room than that of small neutral aerosol particles. Within this size range, a lower initial position of the droplets in the room results in a higher deposition rate of the droplets on the floor. © 2005 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/76035
ISSN
2013 Impact Factor: 2.700
2013 SCImago Journal Rankings: 1.634
ISI Accession Number ID
References

 

Author Affiliations
  1. The University of Hong Kong
  2. University of Science and Technology of China
DC FieldValueLanguage
dc.contributor.authorSun, Wen_HK
dc.contributor.authorJi, Jen_HK
dc.contributor.authorLi, Yen_HK
dc.contributor.authorXie, Xen_HK
dc.date.accessioned2010-09-06T07:16:59Z-
dc.date.available2010-09-06T07:16:59Z-
dc.date.issued2007en_HK
dc.identifier.citationBuilding And Environment, 2007, v. 42 n. 2, p. 1011-1017en_HK
dc.identifier.issn0360-1323en_HK
dc.identifier.urihttp://hdl.handle.net/10722/76035-
dc.description.abstractMovement and evaporation of small droplets in the room air are investigated in this paper through CFD simulations. A modified drift-flux model is presented with the droplet evaporation rate and the drift velocity expressed as simple algebra functions of droplet diameter, which is integrated in the transport equations of droplet number density and droplet bulk density. Evaporating droplets are treated as a continuum phase with one way coupling with the carrier phase, i.e. air. Our numerical simulations reveal that the distribution of the large evaporating droplets in the ventilated room air is characterized by a combination of the settling feature when droplets are first generated and released and the dispersion feature after the droplets are evaporated to be either very fine or become droplet nuclei. For droplets less than 50 μm in diameter, the dispersion feature is dominant in the test room that we simulated, while for droplets larger than 100 μm in diameter, the settling feature dominates. For evaporating droplets between these two sizes, the spatial distribution of droplets tends to be located at the lower part of the test room than that of small neutral aerosol particles. Within this size range, a lower initial position of the droplets in the room results in a higher deposition rate of the droplets on the floor. © 2005 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/buildenven_HK
dc.relation.ispartofBuilding and Environmenten_HK
dc.subjectCFDen_HK
dc.subjectDrift-flux modelen_HK
dc.subjectDroplet dispersionen_HK
dc.subjectEvaporating dropleten_HK
dc.subjectVentilationen_HK
dc.titleDispersion and settling characteristics of evaporating droplets in ventilated roomen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0360-1323&volume=42&spage=1011&epage=1017&date=2007&atitle=Dispersion+and+settling+characteristics+of+evaporating+droplets+in+ventilated+roomen_HK
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.buildenv.2005.10.034en_HK
dc.identifier.scopuseid_2-s2.0-33748932358en_HK
dc.identifier.hkuros148106en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33748932358&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume42en_HK
dc.identifier.issue2en_HK
dc.identifier.spage1011en_HK
dc.identifier.epage1017en_HK
dc.identifier.isiWOS:000245165700054-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridSun, W=8648663400en_HK
dc.identifier.scopusauthoridJi, J=7201361998en_HK
dc.identifier.scopusauthoridLi, Y=7502094052en_HK
dc.identifier.scopusauthoridXie, X=14627859000en_HK

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