Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux

Detalhes bibliográficos
Autor(a) principal: Costa, V. A. F.
Data de Publicação: 2008
Outros Autores: Mendonça, M. L., Figueiredo, A. R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/4177
https://doi.org/10.1016/j.ijheatmasstransfer.2007.11.033
Resumo: Porous media with high water content can be successfully used as thermal barriers to operate under high exposure temperatures and/or high heat fluxes. Modeling and simulation of such systems presents difficulties and challenges, which are pointed and worked out in this work. Liquid water and water vapor transfers are considered, including the capillary effects for the liquid phase, as well as the air transfer inside the porous medium. Heat transfer model includes conduction, radiation, enthalpy convection, sensible heating and phase change. A realistic model is considered at the exposed boundary in what concerns mass transfer: the outflow mass transfer is dictated by the water effusion and not by the convection transfer mechanism between the exposed surface and the environment. A set of numerical aspects is detailed, concerning both the numerical modeling and the solution of the discretization equations, which are crucial to obtain successful simulations. Some illustrative results are presented, showing the potential of the wetted porous media when used as thermal barriers, as well as the capabilities of the presented physical and numerical models to deal with such systems.
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spelling Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat fluxPorous media with high water content can be successfully used as thermal barriers to operate under high exposure temperatures and/or high heat fluxes. Modeling and simulation of such systems presents difficulties and challenges, which are pointed and worked out in this work. Liquid water and water vapor transfers are considered, including the capillary effects for the liquid phase, as well as the air transfer inside the porous medium. Heat transfer model includes conduction, radiation, enthalpy convection, sensible heating and phase change. A realistic model is considered at the exposed boundary in what concerns mass transfer: the outflow mass transfer is dictated by the water effusion and not by the convection transfer mechanism between the exposed surface and the environment. A set of numerical aspects is detailed, concerning both the numerical modeling and the solution of the discretization equations, which are crucial to obtain successful simulations. Some illustrative results are presented, showing the potential of the wetted porous media when used as thermal barriers, as well as the capabilities of the presented physical and numerical models to deal with such systems.http://www.sciencedirect.com/science/article/B6V3H-4RKDHVC-2/1/633ef2cefc7a7e2178f1d59743e3d2412008info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/4177http://hdl.handle.net/10316/4177https://doi.org/10.1016/j.ijheatmasstransfer.2007.11.033engInternational Journal of Heat and Mass Transfer. 51:13-14 (2008) 3342-3354Costa, V. A. F.Mendonça, M. L.Figueiredo, A. R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:49:07Zoai:estudogeral.uc.pt:10316/4177Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:58:32.965520Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
title Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
spellingShingle Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
Costa, V. A. F.
title_short Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
title_full Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
title_fullStr Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
title_full_unstemmed Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
title_sort Modeling and simulation of wetted porous thermal barriers operating under high temperature or high heat flux
author Costa, V. A. F.
author_facet Costa, V. A. F.
Mendonça, M. L.
Figueiredo, A. R.
author_role author
author2 Mendonça, M. L.
Figueiredo, A. R.
author2_role author
author
dc.contributor.author.fl_str_mv Costa, V. A. F.
Mendonça, M. L.
Figueiredo, A. R.
description Porous media with high water content can be successfully used as thermal barriers to operate under high exposure temperatures and/or high heat fluxes. Modeling and simulation of such systems presents difficulties and challenges, which are pointed and worked out in this work. Liquid water and water vapor transfers are considered, including the capillary effects for the liquid phase, as well as the air transfer inside the porous medium. Heat transfer model includes conduction, radiation, enthalpy convection, sensible heating and phase change. A realistic model is considered at the exposed boundary in what concerns mass transfer: the outflow mass transfer is dictated by the water effusion and not by the convection transfer mechanism between the exposed surface and the environment. A set of numerical aspects is detailed, concerning both the numerical modeling and the solution of the discretization equations, which are crucial to obtain successful simulations. Some illustrative results are presented, showing the potential of the wetted porous media when used as thermal barriers, as well as the capabilities of the presented physical and numerical models to deal with such systems.
publishDate 2008
dc.date.none.fl_str_mv 2008
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/4177
http://hdl.handle.net/10316/4177
https://doi.org/10.1016/j.ijheatmasstransfer.2007.11.033
url http://hdl.handle.net/10316/4177
https://doi.org/10.1016/j.ijheatmasstransfer.2007.11.033
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv International Journal of Heat and Mass Transfer. 51:13-14 (2008) 3342-3354
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dc.format.none.fl_str_mv aplication/PDF
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