Computational study of the velocity field in the conveying element of a ko-kneader with CFD method / M. Mehranpour in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 2 (06/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 2 (06/2002) . - p. 108-114 Titre : Computational study of the velocity field in the conveying element of a ko-kneader with CFD method Type de document : texte imprimé Auteurs : M. Mehranpour, Auteur ; H. Nazokdast, Auteur ; B. Dabir, Auteur Année de publication : 2002 Article en page(s) : p. 108-114 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Single extrusion - An attempt has been made to predict the velocity field in the conveying element of a Ko-Kneader using CFD method. The effects of both rotating and reciprocating motions of the screw have been taken in to account in three dimensional flow analysis. It has been demonstrated that such computational method can provide a great insight into visualization of the flow field in this element of a Ko-Kneader. Among the variables the reciprocating action was found to play a significant role on enhancing the mixing performance of the Ko-Kneader by means of periodical changing the flow field and shear rate distribution in the channel. DOI : 10.3139/217.1680 En ligne : https://drive.google.com/file/d/1MSQazWalZvbM9miMbb3YG8eFgoxNNwtH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15930 [article]

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Computational study of velocity field in the KE element of a modular ko-kneader with CFD method / M. Mehranpour in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 330-337 Titre : Computational study of velocity field in the KE element of a modular ko-kneader with CFD method Type de document : texte imprimé Auteurs : M. Mehranpour, Auteur ; H. Nazokdast, Auteur ; B. Dabir, Auteur Année de publication : 2003 Article en page(s) : p. 330-337 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Attempts were made to predict the velocity field and shear rate distribution of a Newtonian type fluid in the KE element of the Buss Ko-Kneader by means of CFD method. The role of both rotating and reciprocating motion have been considered in three dimensional flow field. The computed results showed appreciable changes in the velocity counters during a period of reciprocating motion, and these changes were greater for the transverse flow compared to the down channel flow. The predicted results also showed pronounced variations in the velocity profile of the transverse flow regarding both with direction and extent of drag and pressure flow as a result of reciprocating action, while the down channel velocity profile was found to be almost unaffected. The extent of shear rate and hence shear rate distribution were found to be dominantly control by the down channel flow while transverse flow has a greater influence in determining the residence time distribution. DOI : 10.3139/217.1751 En ligne : https://drive.google.com/file/d/14SNa49H_szelZ-gLIdVfw12t2zhoo275/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15814 [article]

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Estimation of residence time distribution in two elements of a Ko-kneader / M. Mehranpour in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 1 (03/2002) . - p. 22-25 Titre : Estimation of residence time distribution in two elements of a Ko-kneader Type de document : texte imprimé Auteurs : M. Mehranpour, Auteur ; H. Nazokdast, Auteur ; B. Dabir, Auteur Année de publication : 2002 Article en page(s) : p. 22-25 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : An attempt has been made to estimate the resident time distribution (RTD) in the KE and EZ elements of the Buss Ko-Kneader. The effect of both rotating and reciprocating motions of the screw were taken n to account in the flow analysis as well as in a simplified mathematical model developed for the RTD estimations. The basic function employed in the present work was F(t) = ∫ f(t) dt, where f(t) dt defined as dq/q was evaluated as a function of the channel depth. Due to the periodic nature of the system averages of minimum resident time was considered as tmin in the above equation. The computation of the model was carried out to evaluated the F(t) as a function of time for both KE and EZ elements. These results demonstrate that the residence time distribution in KE element is slightly narrower than that in EZ element. DOI : 10.3139/217.1677 En ligne : https://drive.google.com/file/d/1OX7eNJtEJAe9AcTtxLwPIZttH_0cv-xD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15957 [article]

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Prediction of residence time distribution for different screw configurations of a ko-kneader by using a cluster model / M. Mehranpour in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 1 (03/2004) . - p. 13-15 Titre : Prediction of residence time distribution for different screw configurations of a ko-kneader by using a cluster model Type de document : texte imprimé Auteurs : M. Mehranpour, Auteur ; B. Dabir, Auteur ; Hossein Nazockdast, Auteur Année de publication : 2004 Article en page(s) : p. 13-15 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Prediction of residence time distribution (RTD) in the modular type screw extruders has always been one of the most attractive subjects for predicting. In the present work an attempt was made to establish a method with functionality similar to additive rule for predicting RTD of the modular screw extruders with different configurations such as Buss Ko-Kneader. Results predicted from this method, which was named as cluster model, were compared with the results predicted based on our previously reported trajectory method as well as experimental results. A reasonability good agreement was found between these results justified reliability of the cluster model for being used as a new approach to predict the RTD of the modular screw extruders. DOI : 10.3139/217.1758 En ligne : https://drive.google.com/file/d/1T-seYCJq3-4qX5K-yQStJxdihSjaIKxV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3289 [article]

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Prediction of residence time distribution in EZ and KE element of a ko-kneader by using CFD method / M. Mehranpour in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 327-329 Titre : Prediction of residence time distribution in EZ and KE element of a ko-kneader by using CFD method Type de document : texte imprimé Auteurs : M. Mehranpour, Auteur ; H. Nazokdast, Auteur ; B. Dabir, Auteur Année de publication : 2003 Article en page(s) : p. 327-329 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Residence time distribution is among the important parameters of the Buss Ko-Kneader which allows one to better understand the flow conditions inside the system and to get information on mixing efficiency. However it has always been a difficult task to predict the RTD of complex geometries such as Buss elements. The aim of the present work was to estimate the residence time distribution in EZ and KE element of the Buss Ko-Kneader by utilizing an elemental tracing method performed on the flow fields in the same elements which were analysized by CFD method. The effects of rotating and reciprocating motions of the screw have been taken into account in three dimensional flow analysis. It was demonstrated that these results can provide valuable information on mixing performance of these two elements. DOI : 10.3139/217.1757 En ligne : https://drive.google.com/file/d/1QYJanA7d87MQTPmjWqsyVfsGEdlfyzGc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15813 [article]

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