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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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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