Non-gray radiative convective conductive modeling of a double glass window with a cavity filled with a mixture of absorbing gases

dc.creatorIsmail, KAR
dc.creatorSalinas, C
dc.date2006
dc.dateAUG
dc.date2014-11-14T15:08:54Z
dc.date2015-11-26T16:07:16Z
dc.date2014-11-14T15:08:54Z
dc.date2015-11-26T16:07:16Z
dc.date.accessioned2018-03-28T22:55:58Z
dc.date.available2018-03-28T22:55:58Z
dc.identifierInternational Journal Of Heat And Mass Transfer. Pergamon-elsevier Science Ltd, v. 49, n. 17-18, n. 2972, n. 2983, 2006.
dc.identifier0017-9310
dc.identifierWOS:000239417300021
dc.identifier10.1016/j.ijheatmasstransfer.2006.01.051
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/61995
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/61995
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/61995
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1266093
dc.descriptionCoupled radiation and natural convection heat transfer occurs in vertical enclosures with walls at different temperatures filled with gas media. In glass window thermal insulation applications in hot climates, infrared absorbing gases appear as an alternative to improve their thermal performance. The thermal modeling of glass windows filled with non-gray absorbing gases is somewhat difficult due to the spectral variation of the absorption coefficients of the gases and the phenomena of natural convection. In this work, the cumulative wave-number (CW) model is used to treat the spectral properties of mixtures of absorbing gases and the radiative transport equation is solved using CW model and the discrete ordinates method. Due to the range of temperature variation, the mixture of gases is considered as homogeneous. The absorption coefficients were obtained from the database HITRAN. First, the natural convection in a cavity with high aspect ratio is modeled using a CFD code and the local and global Nusselt numbers are computed and compared with available empirical correlations. Also, the flow pattern for different Rayleigh numbers is analyzed. Then, the heat transfer in the gas domain is approximated by a radiative conductive model with specified heat flux at boundaries which is equivalent to convective transport at the walls surroundings. The energy equation in its two-dimensional form is solved by the finite volume technique. Three types of gas mixtures, highly absorbing, medium and transparent are investigated, to determinate their effectiveness in reducing heat gain by the gas ambient. Reflective glasses are also considered. The numerical method to solve radiative heat transport equation in gray and non-gray participant media was validated previously. The temperatures distributions in the gas and the glass domain are computed and the thermal performance of the gas mixtures is evaluated and discussed. Also, comparison with pure radiative conductive model is shown. (c) 2006 Elsevier Ltd. All rights reserved.
dc.description49
dc.description17-18
dc.description2972
dc.description2983
dc.languageen
dc.publisherPergamon-elsevier Science Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationInternational Journal Of Heat And Mass Transfer
dc.relationInt. J. Heat Mass Transf.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectnumerical modeling
dc.subjectcumulative wavenumber model
dc.subjectradiation conduction convection
dc.subjectglazing
dc.subjectnon-gray gases
dc.subjectSpectrum Correlated Model
dc.subjectHeat-transfer
dc.subjectNatural-convection
dc.subjectEnclosures
dc.subjectMedia
dc.titleNon-gray radiative convective conductive modeling of a double glass window with a cavity filled with a mixture of absorbing gases
dc.typeArtículos de revistas


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