A semi-empirical model for condensation heat transfer coefficient of mixed ethanol-water vapors / Yang Li in Journal of heat transfer, Vol. 133 N° 6 (Juin 2011)  

Public ISBD [article]  inJournal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [061501/1-11] Titre : A semi-empirical model for condensation heat transfer coefficient of mixed ethanol-water vapors Type de document : texte imprimé Auteurs : Yang Li, Auteur ; JunJie Yan, Auteur ; JinShi Wang, Auteur Année de publication : 2011 Article en page(s) : pp. [061501/1-11] Note générale : Physique Langues : Anglais (eng) Mots-clés : Ethanol-water vapors Marangoni condensation Pseudo-dropwise Heat transfer Theoretical madel Index. décimale : 536 Chaleur. Thermodynamique Résumé : A semi-empirical model describing the heat transfer characteristics of the pseudo-dropwise condensation of binary vapor on a cooled vertical tube has been formulated. By ignoring the thin film always present on the condensation surface and the intensification of mass transfer caused by the Marangoni effect, the heat transfer characteristics of pseudo-dropwise condensation are tentatively formulated. The model involved an analysis of the diffusion process in the vapor boundary layer along with the heat transfer process through the condensate drops. This model was applied to the condensation of the saturated binary vapor of ethanol and water, and was examined using experimental data at vapor pressure values of 101.33 kPa (provided by Utaka and Wang, 2004, “Characteristic Curves and the Promotion Effect of Ethanol Addition on Steam Condensation Heat Transfer,” Int. J. Heat Mass Transfer, 47, pp. 4507–4516), 84.52 kPa and 47.36 kPa. Calculations using the model show a similar trend to the experimental measurements. With the change of the vapor-to-surface temperature difference, the heat transfer coefficients revealed nonlinear characteristics, with the peak values under all ethanol mass fractions of binary vapor. The heat transfer coefficients increased with decreasing ethanol mass fraction. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] A semi-empirical model for condensation heat transfer coefficient of mixed ethanol-water vapors [texte imprimé] / Yang Li, Auteur ; JunJie Yan, Auteur ; JinShi Wang, Auteur . - 2011 . - pp. [061501/1-11]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [061501/1-11] Mots-clés : Ethanol-water vapors Marangoni condensation Pseudo-dropwise Heat transfer Theoretical madel Index. décimale : 536 Chaleur. Thermodynamique Résumé : A semi-empirical model describing the heat transfer characteristics of the pseudo-dropwise condensation of binary vapor on a cooled vertical tube has been formulated. By ignoring the thin film always present on the condensation surface and the intensification of mass transfer caused by the Marangoni effect, the heat transfer characteristics of pseudo-dropwise condensation are tentatively formulated. The model involved an analysis of the diffusion process in the vapor boundary layer along with the heat transfer process through the condensate drops. This model was applied to the condensation of the saturated binary vapor of ethanol and water, and was examined using experimental data at vapor pressure values of 101.33 kPa (provided by Utaka and Wang, 2004, “Characteristic Curves and the Promotion Effect of Ethanol Addition on Steam Condensation Heat Transfer,” Int. J. Heat Mass Transfer, 47, pp. 4507–4516), 84.52 kPa and 47.36 kPa. Calculations using the model show a similar trend to the experimental measurements. With the change of the vapor-to-surface temperature difference, the heat transfer coefficients revealed nonlinear characteristics, with the peak values under all ethanol mass fractions of binary vapor. The heat transfer coefficients increased with decreasing ethanol mass fraction. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

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