Documents disponibles écrits par cet auteur

Critical analysis of maxwell’s equal area rule / Karthikeyan Rajendran in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7687–7692 Titre : Critical analysis of maxwell’s equal area rule : implications for phase equilibrium calculations Type de document : texte imprimé Auteurs : Karthikeyan Rajendran, Auteur ; R. Ravi, Auteur Année de publication : 2010 Article en page(s) : pp. 7687–7692 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Phase  Equilibrium Résumé : The fundamental flaws inherent in Maxwell’s equal area rule are analyzed. Using an alternative principle that overcomes the limitations of Maxwell’s rule, general equations are derived for determining the saturation pressure and other properties associated with the liquid−vapor phase transition given an arbitrary equation of state. The equivalence of the equation for saturation pressure to those available in the literature is proved. It is found that the alternative principle predicts saturation pressures that are significantly different from those calculated using Maxwell’s rule. These results are based on numerical studies on three different equations of state and fifteen substances. Similar results are obtained for the vaporization entropy as well. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100571m [article] Critical analysis of maxwell’s equal area rule : implications for phase equilibrium calculations [texte imprimé] / Karthikeyan Rajendran, Auteur ; R. Ravi, Auteur . - 2010 . - pp. 7687–7692. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7687–7692 Mots-clés : Phase  Equilibrium Résumé : The fundamental flaws inherent in Maxwell’s equal area rule are analyzed. Using an alternative principle that overcomes the limitations of Maxwell’s rule, general equations are derived for determining the saturation pressure and other properties associated with the liquid−vapor phase transition given an arbitrary equation of state. The equivalence of the equation for saturation pressure to those available in the literature is proved. It is found that the alternative principle predicts saturation pressures that are significantly different from those calculated using Maxwell’s rule. These results are based on numerical studies on three different equations of state and fifteen substances. Similar results are obtained for the vaporization entropy as well. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100571m

The gibbs - duhem equation, the ideal gas mixture, and a generalized interpretation of dalton’s law / R. Ravi in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13076–13082 Titre : The gibbs - duhem equation, the ideal gas mixture, and a generalized interpretation of dalton’s law Type de document : texte imprimé Auteurs : R. Ravi, Auteur Année de publication : 2012 Article en page(s) : pp. 13076–13082 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gibbs  duhem  equation  Gas  mixture Résumé : The ideas used by Gibbs in defining the ideal gas mixture are brought to light in view of their fundamental significance and the fact that they have not received due attention in the literature. Specifically, the central role played by the well-known Gibbs−Duhem equation in this regard is explained. The concept of a fundamental equation and its importance in the definition of an ideal gas as well as an ideal gas mixture is elucidated. The manner in which these ideas enabled Gibbs to give a very general interpretation of Dalton’s law is examined in detail. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101614s [article] The gibbs - duhem equation, the ideal gas mixture, and a generalized interpretation of dalton’s law [texte imprimé] / R. Ravi, Auteur . - 2012 . - pp. 13076–13082. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13076–13082 Mots-clés : Gibbs  duhem  equation  Gas  mixture Résumé : The ideas used by Gibbs in defining the ideal gas mixture are brought to light in view of their fundamental significance and the fact that they have not received due attention in the literature. Specifically, the central role played by the well-known Gibbs−Duhem equation in this regard is explained. The concept of a fundamental equation and its importance in the definition of an ideal gas as well as an ideal gas mixture is elucidated. The manner in which these ideas enabled Gibbs to give a very general interpretation of Dalton’s law is examined in detail. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101614s

Toward a unified framework for interpreting the phase rule / R. Ravi in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13853–13861 Titre : Toward a unified framework for interpreting the phase rule Type de document : texte imprimé Auteurs : R. Ravi, Auteur Année de publication : 2012 Article en page(s) : pp. 13853–13861 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Phase  rule Résumé : The apparent differences in the statements of the phase rule for the two sets of variables commonly used, namely, temperature, pressure, and mole fractions on the one hand and temperature, pressure, and chemical potentials on the other are resolved by developing a framework in which the phase rule may be stated and analyzed in terms of a whole class of variable sets. The framework is restricted to the case where all the components are present in all the phases. Central to the framework is the notion, due to Gibbs, of a fundamental relation for homogeneous states and the associated general equation cast in terms of intensive and specific variables. The significance of the Gibbs–Duhem equations within the context of the phase rule is brought out. The lead provided by Gibbs in his approach to the phase rule is utilized to carry out a local analysis of the equations that result from the criteria of equilibrium for the two sets of variables referred to above. The central role played by the general equations is brought out. The scope of the phase rule is widened by identifying particular sets of variables that would be suitable for uniquely defining the equilibrium state of a multiphase mixture. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301417n [article] Toward a unified framework for interpreting the phase rule [texte imprimé] / R. Ravi, Auteur . - 2012 . - pp. 13853–13861. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13853–13861 Mots-clés : Phase  rule Résumé : The apparent differences in the statements of the phase rule for the two sets of variables commonly used, namely, temperature, pressure, and mole fractions on the one hand and temperature, pressure, and chemical potentials on the other are resolved by developing a framework in which the phase rule may be stated and analyzed in terms of a whole class of variable sets. The framework is restricted to the case where all the components are present in all the phases. Central to the framework is the notion, due to Gibbs, of a fundamental relation for homogeneous states and the associated general equation cast in terms of intensive and specific variables. The significance of the Gibbs–Duhem equations within the context of the phase rule is brought out. The lead provided by Gibbs in his approach to the phase rule is utilized to carry out a local analysis of the equations that result from the criteria of equilibrium for the two sets of variables referred to above. The central role played by the general equations is brought out. The scope of the phase rule is widened by identifying particular sets of variables that would be suitable for uniquely defining the equilibrium state of a multiphase mixture. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301417n