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Scaling analysis of the unsteady natural convection boundary layer adjacent to an inclined plate for Pr > 1 following instantaneous heating / Suvash C. Saha in Journal of heat transfer, Vol. 133 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [112501/1-9] Titre : Scaling analysis of the unsteady natural convection boundary layer adjacent to an inclined plate for Pr > 1 following instantaneous heating Type de document : texte imprimé Auteurs : Suvash C. Saha, Auteur ; Feng Xu, Auteur ; Md Mamun Molla, Auteur Année de publication : 2012 Article en page(s) : pp. [112501/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Boundary  layers  Flow  simulation  Integral  equations  Natural  convection  Navier-Stokes  equations  Numerical  analysis Index. décimale : 536 Chaleur. Thermodynamique Résumé : The unsteady natural convection boundary layer adjacent to an instantaneously heated inclined plate is investigated using an improved scaling analysis and direct numerical simulations. The development of the unsteady natural convection boundary layer following instantaneous heating may be classified into three distinct stages including a start-up stage, a transitional stage, and a steady state stage, which can be clearly identified in the analytical and numerical results. Major scaling relations of the velocity and thicknesses and the flow development time of the natural convection boundary layer are obtained using triple-layer integral solutions and verified by direct numerical simulations over a wide range of flow parameters. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...] [article] Scaling analysis of the unsteady natural convection boundary layer adjacent to an inclined plate for Pr > 1 following instantaneous heating [texte imprimé] / Suvash C. Saha, Auteur ; Feng Xu, Auteur ; Md Mamun Molla, Auteur . - 2012 . - pp. [112501/1-9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [112501/1-9] Mots-clés : Boundary  layers  Flow  simulation  Integral  equations  Natural  convection  Navier-Stokes  equations  Numerical  analysis Index. décimale : 536 Chaleur. Thermodynamique Résumé : The unsteady natural convection boundary layer adjacent to an instantaneously heated inclined plate is investigated using an improved scaling analysis and direct numerical simulations. The development of the unsteady natural convection boundary layer following instantaneous heating may be classified into three distinct stages including a start-up stage, a transitional stage, and a steady state stage, which can be clearly identified in the analytical and numerical results. Major scaling relations of the velocity and thicknesses and the flow development time of the natural convection boundary layer are obtained using triple-layer integral solutions and verified by direct numerical simulations over a wide range of flow parameters. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...]

Scaling of natural convection of an inclined flat plate / Suvash C. Saha in Journal of heat transfer, Vol. 133 N° 4 (Avril 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [041503/1-9] Titre : Scaling of natural convection of an inclined flat plate : sudden cooling condition Type de document : texte imprimé Auteurs : Suvash C. Saha, Auteur ; John C. Patterson, Auteur ; Chengwang Lei, Auteur Année de publication : 2011 Article en page(s) : pp. [041503/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Natural  convection  Sudden  cooling  Boundary  layer  Unsteady  flow  Instability Index. décimale : 536 Chaleur. Thermodynamique Résumé : The natural convection boundary layer adjacent to an inclined plate subject to sudden cooling boundary condition has been studied. It is found that the cold boundary layer adjacent to the plate is potentially unstable to Rayleigh–Bénard instability if the Rayleigh number exceeds a certain critical value. A scaling relation for the onset of instability of the boundary layer is achieved. The scaling relations have been developed by equating important terms of the governing equations based on the development of the boundary layer with time. The flow adjacent to the plate can be classified broadly into a conductive, a stable convective, or an unstable convective regime determined by the Rayleigh number. Proper scales have been established to quantify the flow properties in each of these flow regimes. An appropriate identification of the time when the instability may set in is discussed. A numerical verification of the time for the onset of instability is also presented in this study. Different flow regimes based on the stability of the boundary layer have been discussed with numerical results. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] Scaling of natural convection of an inclined flat plate : sudden cooling condition [texte imprimé] / Suvash C. Saha, Auteur ; John C. Patterson, Auteur ; Chengwang Lei, Auteur . - 2011 . - pp. [041503/1-9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [041503/1-9] Mots-clés : Natural  convection  Sudden  cooling  Boundary  layer  Unsteady  flow  Instability Index. décimale : 536 Chaleur. Thermodynamique Résumé : The natural convection boundary layer adjacent to an inclined plate subject to sudden cooling boundary condition has been studied. It is found that the cold boundary layer adjacent to the plate is potentially unstable to Rayleigh–Bénard instability if the Rayleigh number exceeds a certain critical value. A scaling relation for the onset of instability of the boundary layer is achieved. The scaling relations have been developed by equating important terms of the governing equations based on the development of the boundary layer with time. The flow adjacent to the plate can be classified broadly into a conductive, a stable convective, or an unstable convective regime determined by the Rayleigh number. Proper scales have been established to quantify the flow properties in each of these flow regimes. An appropriate identification of the time when the instability may set in is discussed. A numerical verification of the time for the onset of instability is also presented in this study. Different flow regimes based on the stability of the boundary layer have been discussed with numerical results. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...]