Generalized flow of Ellis fluid in the screw channel / R. T. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 241-248 Titre : Generalized flow of Ellis fluid in the screw channel : Part I : Parallel plates model Type de document : texte imprimé Auteurs : R. T. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2001 Article en page(s) : p. 241-248 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Analytical expressions for the isothermal, two-dimensional flow of an Ellis fluid in rectangular channel have been derived. The obtained solution describes also the flow of Newtonian and power law fluids as the specific cases. This solution was further adapted for the theoretical analysis of the temperature and pressure effects during the non-isothermal flow of Ellis fluid. the results obtained both for isothermal an non-isothermal flow conditions have been verified numerically. DOI : 10.3139/217.1649 En ligne : https://drive.google.com/file/d/1gYdLjj9xN1NXqF1DXewWR-73GKqeBxUo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15904 [article]

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Generalized flow of Ellis fluid in the screw channel / R. T. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 3 (09/2001) . - p. 249-256 Titre : Generalized flow of Ellis fluid in the screw channel : Part II : Curved channel model Type de document : texte imprimé Auteurs : R. T. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2001 Article en page(s) : p. 249-256 Note générale : Bilbliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Analytical model for the isothermal and non-isothermal, two-dimensional flow of an Ellis fluid in curved channel has been proposed. It describes also the flow of Newtonian and power law fluids as the specific cases. The solution basing on cylindrical coordinates to account the effect of channel curvature on the flow. the results obtained for isothermal and non-isothermal flow conditions have been verified numerically. DOI : 10.3139/217.1650 En ligne : https://drive.google.com/file/d/1TXK_Wm1bqJfywNwOOJ0SAtqO8Z6cR4So/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15905 [article]

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New approach to melt pressure determination during screw channel flow / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 185-192 Titre : New approach to melt pressure determination during screw channel flow Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2021 Article en page(s) : p. 185-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement bidirectionnel Ecoulement unidirectionnel Equations Fluides newtoniens Fluides, Mécanique des Rhéologie Vis d'extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : Basic equations describing steady, two-directional, isothermal and fully developed drag-pressure flow of generalized Newtonian fluid between parallel plates assumed as the appropriate flow model in flat, shallow screw channel, are given. It is shown that the flow output for any generalized Newtonian fluid in the two-directional case can be described by a simple expression with a few parameters depending in a complicated way on pressure gradient, channel geometry and constants of the constitutive model. The expression is also valid for unidirectional flow as the limiting case of the two-directional flow. The parameters must be determined as a rule with numerical methods. To simplify the practical calculations, a few (semi)analytical methods of parameters determination for unidirectional power law flow are discussed first. These methods make possible to calculate analytically the pressure gradient for known output that is typical of screw flow characterization. The results obtained for the unidirectional flow 1-D were generalized to describe the two-directional flow 2-D, which takes into account both longitudinal and transverse velocity components. The generalization is based on translation and dilation of the 1-D flow characteristics by introducing a few additional parameters, which are only dependent on the helix angle and power law exponent. It was found a very good agreement between exact numerical and approximate ( semi)analytical characteristics for both flows. Note de contenu : - Theoretical analysis - Unidirectional flow (1-d) - Two-directional flow (2-d) - Table 1 : Coefficients of polynomials in two variables for parameters in 2-D flow DOI : https://doi.org/10.1515/ipp-2020-4007 En ligne : https://drive.google.com/file/d/16sA9YpARbJTN3O4UCNXgr510Zuobz7lw/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36362 [article]

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Polymer plastication during injection molding / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 252-262 Titre : Polymer plastication during injection molding : Part 1. Mathematical model Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2008 Article en page(s) : p. 252-262 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Index. décimale : 668.9 Polymères Résumé : The mathematical model of polymer plastication in a reciprocating screw injection molding machine is presented. It takes into account all characteristic features of working of a real injector, such as periodical action of the three zones screw, to-and-from screw motion with controlled stroke, static and dynamic melting, etc. Methods for description of time changes of the solid bed profile in the screw channel during injection cycle as a function of operating parameters were developed. Ways of determination of pressure and temperature profiles in the screw channel were also discussed. Methods of caculation of the most important flow characteristics such as plasticizing capacity, power requirements, screw torque, energy consumption were analyzed. Results were presented in a form, which is most convenient for numerical applications in computer simulation DOI : 10.3139/217.2041 En ligne : https://drive.google.com/file/d/1LuxUb-gLrr3OgjrRfGBT-Q5R6Ua7RpCb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2625 [article]

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Polymer plastication during injection molding / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 263-269 Titre : Polymer plastication during injection molding : Part 2 : Simulations and experiments Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2008 Article en page(s) : p. 263-269 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Index. décimale : 668.9 Polymères Résumé : A computer program for the simulation of polymer plastication in screw injection molding machine created on basis of the theoretical model presented in part 1 of this paper is discussed. As simulation examples various process characteristics, e.g. solid bed, pressure and temperature profiles, are computed using the material parameters for high density polyethylene and three-zones-screw of diameter 20 mm. Effects of different geometric and operating parameters on plastication course are also demonstrated. Simulation results with respect to the screw rotation time are compared with experimental data measured for low density polyethylene, polypropylene, polystyrene, polyoxymethylene and polyamide 6. It was found that the computer program reflects correctly all features of a true plasticating system in injection molding machine. It provides also good agreement of model predictions with experimental data. DOI : 10.3139/217.2042 En ligne : https://drive.google.com/file/d/1DziAqcZR-ymmTIyz6-Ig28gS-zQIUvAs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2626 [article]

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