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Local momentum transfer process in a wall region of an agitated vessel equipped with an eccentric impeller / Magdalena Cudak in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 4140–4149 Titre : Local momentum transfer process in a wall region of an agitated vessel equipped with an eccentric impeller Type de document : texte imprimé Auteurs : Magdalena Cudak, Auteur ; Joanna Karcz, Auteur Année de publication : 2011 Article en page(s) : pp. 4140–4149 Note générale : Chimie industrielle Langues : Anglais (eng) Résumé : The results of the experimental studies of local momentum transfer process in the region of the cylindrical wall of an agitated vessel equipped with an eccentric axial flow impeller are presented. The data for eccentrically located impellers both, propeller and HE 3 impeller, differing in the operating liquid pumping mode were compared. In total, 5120 experimental points for both impellers were obtained on the basis of the electrochemical experiments for each of the tested impeller. Axial and angular distributions of the shear rate and friction coefficient in the agitated vessel without baffles were found within the turbulent regime of the Newtonian liquid flow. Local shear stress, dynamic velocity and energy dissipated were also identified in this region of the wall. The results of the study show that the profiles of the transport coefficients depend strongly on the eccentricity e/R, axial and angular coordinates, liquid circulation imposed by axial flow impeller, and liquid turbulence in the agitated vessel. The distributions of the quantities which describe momentum transfer process in the region of the cylindrical wall of the agitated vessel as the function of the e/R, z/H, φ/2π, and Re number were approximated mathematically for both impellers by means of eqs 6−9. Averaged values of the local quantities, obtained as a result of the numerical integration, were described by means eqs 12−17. The eqs 6−9 and 12−17 have no equivalent in the open literature concerning this subject. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101977y [article] Local momentum transfer process in a wall region of an agitated vessel equipped with an eccentric impeller [texte imprimé] / Magdalena Cudak, Auteur ; Joanna Karcz, Auteur . - 2011 . - pp. 4140–4149. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 4140–4149 Résumé : The results of the experimental studies of local momentum transfer process in the region of the cylindrical wall of an agitated vessel equipped with an eccentric axial flow impeller are presented. The data for eccentrically located impellers both, propeller and HE 3 impeller, differing in the operating liquid pumping mode were compared. In total, 5120 experimental points for both impellers were obtained on the basis of the electrochemical experiments for each of the tested impeller. Axial and angular distributions of the shear rate and friction coefficient in the agitated vessel without baffles were found within the turbulent regime of the Newtonian liquid flow. Local shear stress, dynamic velocity and energy dissipated were also identified in this region of the wall. The results of the study show that the profiles of the transport coefficients depend strongly on the eccentricity e/R, axial and angular coordinates, liquid circulation imposed by axial flow impeller, and liquid turbulence in the agitated vessel. The distributions of the quantities which describe momentum transfer process in the region of the cylindrical wall of the agitated vessel as the function of the e/R, z/H, φ/2π, and Re number were approximated mathematically for both impellers by means of eqs 6−9. Averaged values of the local quantities, obtained as a result of the numerical integration, were described by means eqs 12−17. The eqs 6−9 and 12−17 have no equivalent in the open literature concerning this subject. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101977y