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New excess gibbs energy equation for modeling the thermodynamic and transport properties of polymer solutions and nanofluids at different temperatures / Mohammed Taghi Zafarani-Moattar in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8245-8262 Titre : New excess gibbs energy equation for modeling the thermodynamic and transport properties of polymer solutions and nanofluids at different temperatures Type de document : texte imprimé Auteurs : Mohammed Taghi Zafarani-Moattar, Auteur ; Roghayeh Majdan-Cegincara, Auteur Année de publication : 2011 Article en page(s) : pp. 8245-8262 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymer  solutions  Transport  properties  Modeling Résumé : A local composition model is developed for the representation of the excess Gibbs energy of polymer solutions. The model consists of two contributions due to the configurational entropy of mixing, represented by the Freed Flory-Huggins relation, and to the enthalpic contribution, represented by local compositions through nonrandom factor. The model is applied to correlate the solvent activity of binary polymer solutions. The new excess Gibbs energy equation was used along with the absolute rate theory of Eyring for modeling the dynamic viscosity of binary polymer solutions in the entire concentration range at different temperatures considering different molar mass of polymers. The fitting quality of new model has favorably been compared with polymer-NRTL, segment-based-liquid-NRTL, polymer-Wilson, polymer-NRF and polymer-NRF-Wilson models. The validity of the proposed model is especially demonstrated for the whole range of polymer concentrations at different temperatures using different molar masses of polymers. The segment-based approach provides a more physically realistic model for large molecules when diffusion and flow are viewed to occur by a sequence of individual segment jumps into vacancies rather than jumps of the entire large molecule. Therefore, the correlation of viscosity values for nanofluids was also tested with the proposed Eyring-modified NRF model developed with respect to the segment-based approach. The performance of this model in the fitting of viscosity values of nanofluids are compared with the previously used liquid-NRTL model. Results show that this segment-based model is most valid in the fitting of viscosity values of nanofluids in the entire concentration range at different temperatures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332150 [article] New excess gibbs energy equation for modeling the thermodynamic and transport properties of polymer solutions and nanofluids at different temperatures [texte imprimé] / Mohammed Taghi Zafarani-Moattar, Auteur ; Roghayeh Majdan-Cegincara, Auteur . - 2011 . - pp. 8245-8262. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8245-8262 Mots-clés : Polymer  solutions  Transport  properties  Modeling Résumé : A local composition model is developed for the representation of the excess Gibbs energy of polymer solutions. The model consists of two contributions due to the configurational entropy of mixing, represented by the Freed Flory-Huggins relation, and to the enthalpic contribution, represented by local compositions through nonrandom factor. The model is applied to correlate the solvent activity of binary polymer solutions. The new excess Gibbs energy equation was used along with the absolute rate theory of Eyring for modeling the dynamic viscosity of binary polymer solutions in the entire concentration range at different temperatures considering different molar mass of polymers. The fitting quality of new model has favorably been compared with polymer-NRTL, segment-based-liquid-NRTL, polymer-Wilson, polymer-NRF and polymer-NRF-Wilson models. The validity of the proposed model is especially demonstrated for the whole range of polymer concentrations at different temperatures using different molar masses of polymers. The segment-based approach provides a more physically realistic model for large molecules when diffusion and flow are viewed to occur by a sequence of individual segment jumps into vacancies rather than jumps of the entire large molecule. Therefore, the correlation of viscosity values for nanofluids was also tested with the proposed Eyring-modified NRF model developed with respect to the segment-based approach. The performance of this model in the fitting of viscosity values of nanofluids are compared with the previously used liquid-NRTL model. Results show that this segment-based model is most valid in the fitting of viscosity values of nanofluids in the entire concentration range at different temperatures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332150

Viscosity modeling and prediction of aqueous mixed electrolyte solutions / Mohammed Taghi Zafarani-Moattar in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5833–5844 Titre : Viscosity modeling and prediction of aqueous mixed electrolyte solutions Type de document : texte imprimé Auteurs : Mohammed Taghi Zafarani-Moattar, Auteur ; Roghayeh Majdan-Cegincara, Auteur Année de publication : 2009 Article en page(s) : pp. 5833–5844 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Viscosity  Aqueous  mixed  electrolyte  solution  Eyring’s  absolute  rate  theory  Electrolyte  NRTL  Wilson  theories Résumé : Viscosity values of the ternary aqueous mixed electrolyte solutions have been correlated with models based on the Eyring’s absolute rate theory and the electrolyte NRTL, modified NRTL, and Wilson theories for calculating the excess Gibbs energy of activation of the viscous flow. Utilization of the mixing rule assumption in the viscosity parameter of Einstein’s relation has made it possible to use the binary parameters of the local composition models in extending of these equations to the ternary electrolyte systems. Performance of the investigated models in the correlation of the viscosity data of the ternary mixed electrolytes + H2O systems is good. A new semiempirical equation has also satisfactorily been used to correlate the viscosity of the ternary aqueous multielectrolyte solutions. The quality fitting of this semiempirical equation is much better than the aforementioned local composition models. A simple exponential equation with consideration of the temperature dependency has also been used to correlate the viscosity values of solute. Usage of calculated solute viscosity in the suitable mixing rule made it possible to predict the viscosity of aqueous mixed electrolyte solutions. The agreement between the predicted and experimental viscosity values of aqueous multielectrolyte solutions is excellent over the entire composition and temperature range. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801933u [article] Viscosity modeling and prediction of aqueous mixed electrolyte solutions [texte imprimé] / Mohammed Taghi Zafarani-Moattar, Auteur ; Roghayeh Majdan-Cegincara, Auteur . - 2009 . - pp. 5833–5844. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5833–5844 Mots-clés : Viscosity  Aqueous  mixed  electrolyte  solution  Eyring’s  absolute  rate  theory  Electrolyte  NRTL  Wilson  theories Résumé : Viscosity values of the ternary aqueous mixed electrolyte solutions have been correlated with models based on the Eyring’s absolute rate theory and the electrolyte NRTL, modified NRTL, and Wilson theories for calculating the excess Gibbs energy of activation of the viscous flow. Utilization of the mixing rule assumption in the viscosity parameter of Einstein’s relation has made it possible to use the binary parameters of the local composition models in extending of these equations to the ternary electrolyte systems. Performance of the investigated models in the correlation of the viscosity data of the ternary mixed electrolytes + H2O systems is good. A new semiempirical equation has also satisfactorily been used to correlate the viscosity of the ternary aqueous multielectrolyte solutions. The quality fitting of this semiempirical equation is much better than the aforementioned local composition models. A simple exponential equation with consideration of the temperature dependency has also been used to correlate the viscosity values of solute. Usage of calculated solute viscosity in the suitable mixing rule made it possible to predict the viscosity of aqueous mixed electrolyte solutions. The agreement between the predicted and experimental viscosity values of aqueous multielectrolyte solutions is excellent over the entire composition and temperature range. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801933u