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Article experimental determination of CO2 solubility in liquid CH4 / N2 mixtures at cryogenic temperatures / Ting Gao in Industrial & engineering chemistry research, Vol. 51 N° 27 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9403-9408 Titre : Article experimental determination of CO2 solubility in liquid CH4 / N2 mixtures at cryogenic temperatures Type de document : texte imprimé Auteurs : Ting Gao, Auteur ; Taotao Shen, Auteur ; Wensheng Lin, Auteur Année de publication : 2012 Article en page(s) : pp. 9403-9408 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Cryogenics  Solubility  Carbon  dioxide Résumé : Coalbed methane (CBM) is an atypical natural gas that may contain a large amount of nitrogen in addition to methane. When liquefying such CH4/N2 mixtures, knowledge of solid solubility is very important and, in particular, CO2 solubility data are essential for determining the CO2 purification index. Although experimental data for CO2 solubility in pure methane are available for various conditions, such experimental data for CH4/N2 mixtures are rare. In this paper, a solid―liquid equilibrium experimental apparatus using a static-analytic method is described. Data for CO2 solubility in pure liquid methane were obtained and their accuracy was verified by comparison with published values. Solubility of CO2 in CH4/N2 mixtures with nitrogen molar fractions of 10, 30, 50, and 70% were then measured at cryogenic temperatures between -190 and ―150 °C. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26132277 [article] Article experimental determination of CO2 solubility in liquid CH4 / N2 mixtures at cryogenic temperatures [texte imprimé] / Ting Gao, Auteur ; Taotao Shen, Auteur ; Wensheng Lin, Auteur . - 2012 . - pp. 9403-9408. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9403-9408 Mots-clés : Cryogenics  Solubility  Carbon  dioxide Résumé : Coalbed methane (CBM) is an atypical natural gas that may contain a large amount of nitrogen in addition to methane. When liquefying such CH4/N2 mixtures, knowledge of solid solubility is very important and, in particular, CO2 solubility data are essential for determining the CO2 purification index. Although experimental data for CO2 solubility in pure methane are available for various conditions, such experimental data for CH4/N2 mixtures are rare. In this paper, a solid―liquid equilibrium experimental apparatus using a static-analytic method is described. Data for CO2 solubility in pure liquid methane were obtained and their accuracy was verified by comparison with published values. Solubility of CO2 in CH4/N2 mixtures with nitrogen molar fractions of 10, 30, 50, and 70% were then measured at cryogenic temperatures between -190 and ―150 °C. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26132277

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 [...]