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

File Download
  • No File Attached
Links for fulltext
(May Require Subscription)
Supplementary
  • Basic View
  • Metadata View
  • XML View
TitleDispersion and settling characteristics of evaporating droplets in ventilated room
AuthorsSun, W2
Ji, J2
Li, Y1
Xie, X1
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
CitationBuilding And Environment, 2007, v. 42 n. 2, p. 1011-1017 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.buildenv.2005.10.034
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.
ISSN0360-1323
2011 Impact Factor: 2.4
2011 SCImago Journal Rankings: 0.080
DOIhttp://dx.doi.org/10.1016/j.buildenv.2005.10.034
ISI Accession Number IDWOS:000245165700054
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorSun, W
dc.contributor.authorJi, J
dc.contributor.authorLi, Y
dc.contributor.authorXie, X
dc.date.accessioned2010-09-06T07:16:59Z
dc.date.available2010-09-06T07:16:59Z
dc.date.issued2007
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.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationBuilding And Environment, 2007, v. 42 n. 2, p. 1011-1017 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.buildenv.2005.10.034
dc.identifier.doihttp://dx.doi.org/10.1016/j.buildenv.2005.10.034
dc.identifier.epage1017
dc.identifier.hkuros148106
dc.identifier.isiWOS:000245165700054
dc.identifier.issn0360-1323
2011 Impact Factor: 2.4
2011 SCImago Journal Rankings: 0.080
dc.identifier.issue2
dc.identifier.openurl
dc.identifier.scopuseid_2-s2.0-33748932358
dc.identifier.spage1011
dc.identifier.urihttp://hdl.handle.net/10722/76035
dc.identifier.volume42
dc.languageeng
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
dc.publisher.placeUnited Kingdom
dc.relation.ispartofBuilding and Environment
dc.relation.referencesReferences in Scopus
dc.subjectCFD
dc.subjectDrift-flux model
dc.subjectDroplet dispersion
dc.subjectEvaporating droplet
dc.subjectVentilation
dc.titleDispersion and settling characteristics of evaporating droplets in ventilated room
dc.typeArticle
Author Affiliations
  1. The University of Hong Kong
  2. University of Science and Technology of China