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Auteur Dylan M. Kalyon
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Institute of Technology - Castle Point St. Hoboken - New Jersey - USA
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3D finite element simulation of processing of generalized newtonian fluids in counter-rotating and tangential TSE and die combination / M. Malik in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)
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Titre : 3D finite element simulation of processing of generalized newtonian fluids in counter-rotating and tangential TSE and die combination Type de document : texte imprimé Auteurs : M. Malik, Auteur ; Dylan M. Kalyon, Auteur Année de publication : 2005 Article en page(s) : p. 398-409 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A full three-dimensional finite element analysis of the nonisothermal flow of generalized non-Newtonian fluids in counter-rotating tangential twin screw extruder is presented. Previous studies of the simulation of processing in tangential twin screw extruders have focused solely on the twin screw extruder, whereas here the coupled flow and heat transfer occurring in the integrated geometry of the extruder, connected to a die are considered. The FEM based numerical simulation of the coupled momentum-mass-energy conservation equations allowed the determination of the effects of some of the important system parameters, including the power law index and the staggering angle of the screws, on the pumping and pressurization capability of the extruder and the associated degree of fill in the extruder. DOI : 10.3139/217.2013 En ligne : https://drive.google.com/file/d/1Ngk0vG2C3EpStUBkaaVXy5L2uq9f8QbU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2965
in INTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 4 (12/2005) . - p. 398-409[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003422 - Périodique Bibliothèque principale Documentaires Disponible An integrated approach for numerical analysis of coupled flow and heat transfer in co-rotating twin screw extruders / Dylan M. Kalyon in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 3 (07/2007)
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Titre : An integrated approach for numerical analysis of coupled flow and heat transfer in co-rotating twin screw extruders Type de document : texte imprimé Auteurs : Dylan M. Kalyon, Auteur ; M. Malik, Auteur Année de publication : 2007 Article en page(s) : p. 293-302 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The co-rotating twin screw extrusion process is widely employed in chemical industries for the processing of complex fluids including various polymers, suspensions, emulsions and gels. Here we propose a new integrated modeling strategy that is based on the numerical analysis of pressure-generating extrusion elements concomitantly with the pressure-losing extrusion elements of the co-rotating twin screw extrusion process for non-Newtonian fluids under nonisothermal conditions. The numerical analysis undertakes three-dimensional (3-D) finite element simulations of any multiple combinations of forwarding and reversing fully-flighted screw elements with other types of elements including kneading discs staggered in the forward or reverse configurations and the die. The abilities of the methodologies in simulating the coupled flow and heat transfer in industrially-relevant mixing sections or pressurization/die shaping are demonstrated with predictions of the degree of fill and typical velocity, deformation rate, stress magnitude, pressure distributions as functions of various operating parameters and basic twin screw extrusion geometries for a viscoplastic type generalized Newtonian fluid. DOI : 10.3139/217.1020 En ligne : https://drive.google.com/file/d/1QEcPYIhJKK98s3VkfNMmdRX0mP-N6ZTf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2707
in INTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 3 (07/2007) . - p. 293-302[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008072 - Périodique Bibliothèque principale Documentaires Disponible Assessment of the degree of mixedness of filled polymers / M. Erol in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)
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Titre : Assessment of the degree of mixedness of filled polymers : Effects of processing histories in batch mixer and co-rotating and counter-rotating twin screw extruders Type de document : texte imprimé Auteurs : M. Erol, Auteur ; Dylan M. Kalyon, Auteur Année de publication : 2005 Article en page(s) : p. 228-237 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : For a given compounding application the selection of the type of processing equipment, the geometry and the operating conditions is always an important challenge. The outcome of this selection process significantly affects the economics of the process, as well as the microstructural distributions and hence the ultimate properties of the compound. Here mixing indices, defined on the basis of the statistics of the distributions of the concentrations of a plasticized elastomeric binder and graphite filler, were used to quantitatively characterize and compare the degree of mixedness of products of batch mixing, corotating and counter-rotating fully-intermeshing twin screw extrusion processes. Two separate experimental methods, involving the wide-angle x-ray diffraction and thermo gravimetric analyses, were used for the characterization of the mixing indices at two different scales of examination. The mixing indices were sensitive to changes in geometry and operating conditions. The resulting electrical properties of the conductive composite samples, mixed with either the batch or continuous, i. e., using either co-rotating or counter-rotating twin screw extrusion, correlated with their degree of mixedness. The presented methodologies should facilitate more accurate comparisons of the performances of different types of processors and better tailoring of the structure and ultimate properties of filled polymers. DOI : 10.3139/217.1882 En ligne : https://drive.google.com/file/d/1-bzTQMag_wNdJImELfwUXtQdzq8G2XIB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3058
in INTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 3 (09/2005) . - p. 228-237[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003050 - Périodique Bibliothèque principale Documentaires Disponible Compressive squeeze flow of generalized newtonian fluids with apparent wall slip / A. Lawal in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 1 (03/2000)
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Titre : Compressive squeeze flow of generalized newtonian fluids with apparent wall slip Type de document : texte imprimé Auteurs : A. Lawal, Auteur ; Dylan M. Kalyon, Auteur Année de publication : 2000 Article en page(s) : p. 63-71 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The compressive squeeze flow is encountered in various processes like compression molding and in rheometry. It involves a complex deformation field driven by both shear and normal stresses. Here the flow and deformation field generated during the compressive squeeze flow of generalized Newtonian fluids, subject to wall slip, was analyzed using both numerical simulation based on the 2-D Finite Element Method and the 1-D analytical model, which is based on the lubrication assumption. The agreement between the analytical and numerical solutions deteriorates with increasing Navier's wall slip coefficient and the increasing yield stress value of the viscoplastic fluid. The lubrication assumption is valid under various squeeze flow conditions but numerical analysis in conjunction with experimental studies are necessary to determine the ranges of material parameters and operating conditions for which the lubrication assumption is valid. Note de contenu : - ANALYSIS : 2-D finite elment method - Boundary conditions - Numerical solution - 1-D analysis with the lubrication approximation
- Determination of force FDOI : 10.3139/217.1561 En ligne : https://drive.google.com/file/d/1yW3R1h6cEk1SX3Vp9lVXv8SNbMeog0Qu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16075
in INTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 1 (03/2000) . - p. 63-71[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001011 - Périodique Bibliothèque principale Documentaires Disponible Detachment of the polymer melt from the roll surface : calendering analysis and data from a shear roll extruder / Dylan M. Kalyon in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 2 (06/2004)
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Titre : Detachment of the polymer melt from the roll surface : calendering analysis and data from a shear roll extruder Type de document : texte imprimé Auteurs : Dylan M. Kalyon, Auteur ; H. Gevgilili, Auteur ; A. Shah, Auteur Année de publication : 2004 Article en page(s) : p. 129-138 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The detachment behavior of a polymer melt from the hot roll surface/s during roll-driven processes affects the maximum production rates achievable in various processes including calendering, embossing and shear roll milling. Here the continuous shear roll milling process is used to investigate the conditions that lead to the detachment of the polymer melt from the surface of one or both heated rolls. During the shear roll milling process the polymer melt needs to continuously stick to one roll and periodically to stick and then to detach from the other roll (at the nip). Different roll speeds, surface roughness and temperatures are used to facilitate continuous stick to one roll and periodic stick and detachment from the other roll. Shear roll mill process fails to convey the melt in the forward direction under conditions for which the melt detaches from both rolls.
The shear roll mill processing of a high density polyethylene revealed the detachment of the melt from both rolls under various combinations of operating parameters. A calendering model enabling the use of different roll diameters and roll velocities for incompressible generalized Newtonian fluids under isothermal and lubrication flow conditions was developed and used to understand the detachment dynamics. The detachment of the melt from both rolls was revealed to occur when the maximum shear stress at the roll surface exceeds the critical wall shear stress at which the onset of macroscopic wall slip is observed in simple shear flow. These findings suggest that the processing window for roll-driven processes is affected by the wall slip characteristics of the polymer melt and that the processing window can be widened using a better understanding of the wall slip behavior of the materials being processed.DOI : 10.3139/217.1822 En ligne : https://drive.google.com/file/d/1jIrHFQK70kjHfxc5JFesGT8_AV1HZTQH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3280
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Code-barres Cote Support Localisation Section Disponibilité 001028 - Périodique Bibliothèque principale Documentaires Disponible Simulation of co-rotating twin screw extrusion process subject to pressure-dependent wall slip at barrel and screw surfaces : 3D FEM analysis for combinations of forward- and reverse-conveying screw elements / M. Malik in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)
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