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Prediction of turbulent convective heat transfer to supercritical CH4/N2 in a vertical circular tube / Zhongxuan Du 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. [111701/1-6] Titre : Prediction of turbulent convective heat transfer to supercritical CH4/N2 in a vertical circular tube Type de document : texte imprimé Auteurs : Zhongxuan Du, Auteur ; Wensheng Lin, Auteur ; Anzhong Gu, Auteur Année de publication : 2012 Article en page(s) : pp. [111701/1-6] Note générale : Physique Langues : Anglais (eng) Mots-clés : Convection  Cooling  Critical  points  Nitrogen  Organic  compounds  Pipe  flow  Turbulence Index. décimale : 536 Chaleur. Thermodynamique Résumé : Cooling of supercritical CH4/N2 mixture is the most important heat transfer process during coalbed methane (CBM) liquefaction. In this paper, numerical studies of the turbulent convective heat transfer of supercritical CH4/N2 flowing inside a vertical circular tube have been conducted with Lam–Bremhorst low Reynolds turbulence model. The present numerical investigations focus on the effects of the nitrogen content, heat flux, and flow orientation. Results indicate that as nitrogen content increases, the maximum heat transfer coefficient gradually decreases and corresponds to lower temperature. Heat transfer coefficient is slightly affected by heat flux in the liquid-like region and increases with increasing heat flux in the gas-like region. Buoyancy effect gradually increases with decreasing bulk temperature, and reaches its maximum at the pseudo-critical point, and then drops as bulk temperature further decreases. It is significant in the liquid-like region and negligible in the gas-like region. At the same time, buoyancy effect enhances heat transfer in the upward flow and impairs it in the downward flow. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...] [article] Prediction of turbulent convective heat transfer to supercritical CH4/N2 in a vertical circular tube [texte imprimé] / Zhongxuan Du, Auteur ; Wensheng Lin, Auteur ; Anzhong Gu, Auteur . - 2012 . - pp. [111701/1-6]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 11 (Novembre 2011) . - pp. [111701/1-6] Mots-clés : Convection  Cooling  Critical  points  Nitrogen  Organic  compounds  Pipe  flow  Turbulence Index. décimale : 536 Chaleur. Thermodynamique Résumé : Cooling of supercritical CH4/N2 mixture is the most important heat transfer process during coalbed methane (CBM) liquefaction. In this paper, numerical studies of the turbulent convective heat transfer of supercritical CH4/N2 flowing inside a vertical circular tube have been conducted with Lam–Bremhorst low Reynolds turbulence model. The present numerical investigations focus on the effects of the nitrogen content, heat flux, and flow orientation. Results indicate that as nitrogen content increases, the maximum heat transfer coefficient gradually decreases and corresponds to lower temperature. Heat transfer coefficient is slightly affected by heat flux in the liquid-like region and increases with increasing heat flux in the gas-like region. Buoyancy effect gradually increases with decreasing bulk temperature, and reaches its maximum at the pseudo-critical point, and then drops as bulk temperature further decreases. It is significant in the liquid-like region and negligible in the gas-like region. At the same time, buoyancy effect enhances heat transfer in the upward flow and impairs it in the downward flow. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000133000011 [...]