Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 1 (03/2009) . - p. 23-30 Titre : Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage : Part 1 : Wall-slippage in the melt film Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Bornemann, Auteur ; M. Kurte-Jardin, Auteur Année de publication : 2009 Article en page(s) : p. 23-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couches minces Films plastiques Frottements (mécanique) Matières plastiques -- Extrusion Polymères Index. décimale : 668.9 Polymères Résumé : In single-screw extrusion the simulation of the plasticizing process by means of software tools becomes more and more important. These programs need mathematical models that have to be improved continuously to simulate the process values realistically. A two-part article presents an analytical approach to calculate the pressure/throughput and drive power behaviour of wall-slipping polymers in the melting section of single-screw plasticizing units. The investigations that are conducted are based on the notion commonly found in the literature of a melt film forming between the barrel and a compact solid bed, with the simultaneous development of a melt pool. As boundary condition for describing the wall slippage, a critical shear stress, as of which a slippage process commences, and also a slippage-velocity-dependent shear stress is assumed. In this first part of the publication, the investigations focus on the processes that take place in the melt film. A new model is developed for describing the process behaviour in this area. DOI : 10.3139/217.2163 En ligne : https://drive.google.com/file/d/1NFmuwpGWyKyi7GsHPLV8GWMqJwEr939O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4204 [article]

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Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 1 (03/2009) . - p. 31-40 Titre : Analytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage : Part 2 : Wall-slippage in the melt pool and coupling of the system Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Bornemann, Auteur ; M. Kurte-Jardin, Auteur Année de publication : 2009 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couches minces Films plastiques Frottements (mécanique) Matières plastiques -- Extrusion Polymères Index. décimale : 668.9 Polymères Résumé : A two-part article presents a process model developed at the KTP for describing the pressure/throughput and drive power behaviour of wall-slipping polymers in the melting section of single-screw plasticizing units. After a new model for describing the flow behaviour in the melt film was developed in the first part of the paper, this second part now covers the adaptation of an existing process model for pure melt conveyance to allow for the processes that take place in the melt pool, and the extension of the model to include the drive power calculation. Following this, the two individual models are then coupled through the assumption of a constant pressure gradient in the conveying direction. Using the overall model that is generated, the pressure/throughput and power behaviour during melting are investigated on the basis of the influencing dimensionless variables. This requires the geometry of the solid bed and the solid bed velocity to be specified as input variables. Apart from this, the other material parameters that need to be defined are the viscosity of the polymer melt, the critical shear stress, a material-specific parameter for describing the slipping-velocity-dependent shear stress and the operating point of the process that is taken as a basis. DOI : 10.3139/217.2164 En ligne : https://drive.google.com/file/d/1feemEa9GlLS8s0gso6jb7AjmJ11yozde/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4205 [article]

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Description of the pressure/throughput behavior of a single-screw plasticating unit in consideration of wall slippage effects for non-newtonian material and 1-D flow / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 3 (07/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 3 (07/2006) . - p. 272-282 Titre : Description of the pressure/throughput behavior of a single-screw plasticating unit in consideration of wall slippage effects for non-newtonian material and 1-D flow Type de document : texte imprimé Auteurs : H. Potente, Auteur ; M. Kurte-Jardin, Auteur ; K. Timmermann, Auteur Année de publication : 2006 Article en page(s) : p. 272-282 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Up to now, existing mathematical models can only describe the throughput behaviour of compounding extruders assuming the condition of a wall adhering melt. However, there is a variety of polymer melts, as well as polymer suspensions, ceramic materials and food stuffs, which in the course of manufacturing are wall-slipping. A mathematical model describing the behaviour of the isothermal flow of non-Newtonian materials is developed. In addition to the development of the analytical model, which is based on Flumerfelt et al. [1] and Hirshberger [2], the flow behaviour of wall-slipping polymer melts is also analysed using Finite-Element-Simulations (FE). Comparison of the results for pressure, throughput and velocity profiles along the channel depth shows a very high degree of agreement. DOI : 10.3139/217.0096 En ligne : https://drive.google.com/file/d/1thtXyGWjdfF-TlzhN4ULIANZmlZ_7tUo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2841 [article]

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Modeling the temperature development of wall-slipping polymers in single-screw channels / M. Kurte-Jardin in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 106-113 Titre : Modeling the temperature development of wall-slipping polymers in single-screw channels Type de document : texte imprimé Auteurs : M. Kurte-Jardin, Auteur ; H. Potente, Auteur ; K. Sigge, Auteur ; M. Bornemann, Auteur Année de publication : 2009 Article en page(s) : p. 106-113 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Wall-slipping materials show lower melt temperature increase than wall-adhering materials on account of the reduced dissipated power component in the system, as is set out in Potente and Kurte-Jardin (2005) and Potente et al. (2005a). Up until now, however, there have not been any models for describing the development of the melt temperature in a single-screw channel when wall-slipping polymers are being processed. For this reason, a methodology of predicting the melt temperature is described. The new model is based on an existing analytical procedure that has been extended by numerical flow simulation results of isothermal 2,5D FE calculations. A comparison of the predicted mean melt temperatures with non-isothermal 3D FE flow simulation results leads to good agreement, what justifies further investigations. DOI : 10.3139/217.2125 En ligne : https://drive.google.com/file/d/1cqzdYrwgYONaTlhUuGEol8Al6xNFLUGO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5222 [article]

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Two dimensional description of pressure-throughput behaviour of newtonian materials considering wall slippage effects / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 3 (09/2005) . - p. 312-321 Titre : Two dimensional description of pressure-throughput behaviour of newtonian materials considering wall slippage effects Type de document : texte imprimé Auteurs : H. Potente, Auteur ; K. Timmermann, Auteur ; S. Klus, Auteur ; M. Kurte-Jardin, Auteur Année de publication : 2005 Article en page(s) : p. 312-321 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The description of pressure-throughput behaviour of wall adhering melts in plastifying machines has been issued in a number of publications, e. g. [1 to 4] in details. Nevertheless there are a variety of polymer melts as well as elastomers, polymer suspensions, ceramic materials and food stuff, which do not behave wall adhering in the course of manufacturing. The theoretical discussion of the pressure-throughput behaviour has not sufficiently been described up to now. Worth’s [5] case studies include the isothermal one-dimensional flow of a Newtonian medium in an unwinded screw channel. He assumed that after exceeding a critical shear rate the slipping process starts on the barrel wall only – but not on channel wall and screw root surface. Mennig, [6 to 9] took up this statement again and assuming a shear rate on the barrel wall as well as on the screw root surface he derived simple relations for the radial velocity profile from it. Lawal and Kalyon [10 to 12] have developed an analytical model that describes the behaviour of visco-plastic liquids in flat channels for different quotients of wall slippage, which are derived from the wall slippage quotients on screw root surface and on barrel wall. A mathematical model describing the flow behaviour for the two-dimensional Newtonian, isothermal case has been developed for wall slipping materials in order to describe the pressure-throughput behaviour multi-dimensionally. In addition to the development of the analytical calculating model the flow behaviour of wall slipping polymer melts has been analysed by using the finite-element-calculation (FEM). Comparison of the pressure-throughput behaviour results show a high degree of conformity in the calculation results. DOI : 10.3139/217.1893 En ligne : https://drive.google.com/file/d/1tXIgnG_EFWpbohQf0lFg15PzJyg0oF4a/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3068 [article]

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