Experiments on characteristic deformation and breakup behaviors of an immiscible drop in a screw channel flow / H. S. Jun in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 3 (09/2004) . - p. 218-224 Titre : Experiments on characteristic deformation and breakup behaviors of an immiscible drop in a screw channel flow Type de document : texte imprimé Auteurs : H. S. Jun, Auteur ; W. R. Hwang, Auteur ; T. H. Kwon, Auteur Année de publication : 2004 Article en page(s) : p. 218-224 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Deformation and breakup mechanisms of an immiscible drop were investigated experimentally in a screw channel flow, which mimics the flow in the metering section of the single screw extruder. It was observed that the deformation/breakup mechanisms are far distinct from the well-known routes for the linear flow, mainly because of the complex flow history that can be characterized by the repetition of strong/weak shear, the continuously varying shear direction and the acceleration/deceleration. The experimental observations include: cometlike thread formation with the large bulbous head and the long narrow tail; the initiation of the breakup at the entrance of the low-shear zone; breakup by asymmetric end pinching; breakup by the growth of the capillary wave, propagating from the tail toward the head; monotonically decreasing droplet size distribution from the head to tail. The mechanism for the comet-like thread formation has been investigated by using the numerically obtained flow field. DOI : 10.3139/217.1833 En ligne : https://drive.google.com/file/d/1ZIZj_lwVKGtaKAyqcthh_hWk6mM9bqvT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3103 [article]

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Resonant and invariant advection in single-screw extrusion / W. R. Hwang in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 309-317 Titre : Resonant and invariant advection in single-screw extrusion Type de document : texte imprimé Auteurs : W. R. Hwang, Auteur ; T. H. Kwon, Auteur Année de publication : 2002 Article en page(s) : p. 309-317 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this paper, we discussed how unmixed and well-mixed zones are determined by the practical design parameters of the Chaos Screw (CS) system for the single-screw extruder, e.g. the helix angle, the magnitude of adverse pressure gradient, and the fraction of no-barrier zone. The key concept is the frequency ratio distribution of the unperturbed system. Through the extensive three-dimensional numerical simulations with finite element methods and particle tracing techniques, successive creation and breakup of resonant orbits and KAM tori in terms of design parameters are presented. The results show that one can predict the spatial configuration of well-mixed and unmixed zones from the frequency ratio distribution and the amount of the perturbation strength. Finally, the exit time distributions caused by dynamical structures are discussed. Note de contenu : - MODELING : System - Frequency ratios - NUMERICAL ANALYSES : Numerical methods - Frequency ratio distribution - Overall structures - Four example cases - Longitudinal mixing and exit time distribution DOI : 10.3139/217.1710 En ligne : https://drive.google.com/file/d/1nN8xJRGclwO3jXKebPy5Ov67qO0M98mo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16019 [article]

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