Laminar fluid chaotic mixing in three-dimensional continuous flow domains / M. M. Overd in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 4 (12/2001) . - p. 368-375 Titre : Laminar fluid chaotic mixing in three-dimensional continuous flow domains Type de document : texte imprimé Auteurs : M. M. Overd, Auteur ; S. C. Generalis, Auteur Année de publication : 2001 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Mixing and screw extrusion - Chaos is a relatively new subject in mathematical science. It has rapidly, however, found applications in a diverse range of areas in pure science and engineering. This work considers the application of chaos in viscous fluid mixing, fluids that are. for example, found in the food or polymer industry. It has been shown by many authors that under steady state conditions laminar fluids flow in a streamline motion. It has also been shown that it is possible to increase the degree of disorder in such a system by introducing time dependant moving boundaries. It is well established however, that chaotic motion is not dependent on the variation in streamline alone. The system is required to be operated within a specific range of boundary conditions for chaos to occur. This work presents further investigations of chaotic flow domains concentrating on a property that relates to the divergence and separation of particles originating from small generation zones within the flow domain. The property of divergence of particles is noted to yield conclusions consistent with previously published work in two dimensions. It is then applied to investigate the degree of disorder in three three-dimensional continuous chaotic systems, operating with a range of time and spatially periodic boundary conditions. In order to highlight the benefits of increased levels of mixing when operating the systems under specific conditions characteristic plots, for incremental variations of operating conditions, are presented. It is hoped that by the development of the characteristic plots and concepts presented here that engineers will be able to predict and characterise the degree of disorder in future industrial chaotic mixing equipment. DOI : 10.3139/217.1656 En ligne : https://drive.google.com/file/d/1lYD07CLXXWc9-giygGGuLE7KBG5W7GEB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15921 [article]

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Using computational fluid dynamics to investigate the flow of a viscous fluid in a cavity with oscillating boundaries / M. M. Overd in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 2 (06/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 2 (06/1999) . - p. 128-135 Titre : Using computational fluid dynamics to investigate the flow of a viscous fluid in a cavity with oscillating boundaries Type de document : texte imprimé Auteurs : M. M. Overd, Auteur ; S. C. Generalis, Auteur Année de publication : 1999 Article en page(s) : p. 128-135 Note générale : Nomenclature - Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Many everyday engineering applications crucially depend on the mixing efficiency of the appropriate hardware. Chaotic mixing is pertained to be an effective way of attaining high levels of mixing. In this work we report on viscous fluid flow in a cavity, with oscillating boundaries, that exhibits such chaotic motion. Using computational fluid dynamics we explain the transition from order to chaos which can be observed by a cascade of the trajectory orbit of particles as the time period of oscillation is increased. As the system moves from order into chaos it is shown that a particle will be displaced from ordered streamlines to the point where it moves throughout the whole flow domain thus showing that good mixing is present. An attempt is also made to characterise the transition to aperiodicity, for the studied configuration. Note de contenu : - Flow equations and the system arrangement - Reliability of the method - Cascade into chaos - Particle returning to a reference point - Oscillation of the particle, graphical DOI : 10.3139/217.1533 En ligne : https://drive.google.com/file/d/18w9sEmHWO7fPVYOkAn6eorSGTytDWv9F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16093 [article]

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