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Buoyant convection in superposed metal foam and water layers / V. Kathare in Journal of heat transfer, Vol. 132 N° 1 (Janvier 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 1 (Janvier 2010) . - pp. [014503-1/4] Titre : Buoyant convection in superposed metal foam and water layers Type de document : texte imprimé Auteurs : V. Kathare, Auteur ; F. A. Kulacki, Auteur ; Jane H. Davidson, Auteur Article en page(s) : pp. [014503-1/4] Note générale : Physique Langues : Anglais (eng) Mots-clés : Natural  convection  Metal  foam  Heat  transfer  enhancement Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer measurements for natural convection in superposed metal foam and water layers are reported. Two systems heated at the lower boundary are considered: a water-filled cavity with a foam layer on the heated surface and a water-filled cavity with foam layers on the upper and lower surfaces. The present experiments use open cell copper foams with a nominal porosity of 92%, and the relative thicknesses of the water and foam layers are varied. Steady state Nusselt numbers show that the presence of foam on the boundaries enhances overall heat transfer coefficients over that for the water-only layer. Enhancement of overall Nusselt numbers varies from 12% to 60% depending on Rayleigh number. Sublayer configurations with foam on both heat transfer surfaces are more effective for enhancement than a configuration with foam only on the heated surface. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Buoyant convection in superposed metal foam and water layers [texte imprimé] / V. Kathare, Auteur ; F. A. Kulacki, Auteur ; Jane H. Davidson, Auteur . - pp. [014503-1/4]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 1 (Janvier 2010) . - pp. [014503-1/4] Mots-clés : Natural  convection  Metal  foam  Heat  transfer  enhancement Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer measurements for natural convection in superposed metal foam and water layers are reported. Two systems heated at the lower boundary are considered: a water-filled cavity with a foam layer on the heated surface and a water-filled cavity with foam layers on the upper and lower surfaces. The present experiments use open cell copper foams with a nominal porosity of 92%, and the relative thicknesses of the water and foam layers are varied. Steady state Nusselt numbers show that the presence of foam on the boundaries enhances overall heat transfer coefficients over that for the water-only layer. Enhancement of overall Nusselt numbers varies from 12% to 60% depending on Rayleigh number. Sublayer configurations with foam on both heat transfer surfaces are more effective for enhancement than a configuration with foam only on the heated surface. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]