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Μελέτη Εξαναγκασμένης Διάχυσης σε Ταλαντούμενη Ροή Ιξωδοελαστικού Ρευστού

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dc.contributor.advisor Τσαγγάρης, Σωκράτης el
dc.contributor.author Τσούμας, Νικόλαος Γ. el
dc.contributor.author Tsoumas, Nicholas G. en
dc.date.accessioned 2011-03-21T08:16:28Z
dc.date.available 2011-03-21T08:16:28Z
dc.date.copyright 2011-03-15
dc.date.issued 2011-03-21T08:16:28Z
dc.date.submitted 2011-03-15
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/3847
dc.identifier.uri http://dx.doi.org/10.26240/heal.ntua.6972
dc.description 120 σ. el
dc.description.abstract In this thesis we examine the phenomenon of forced diffusion of a substance which is dissolved in a viscoelastic fluid that oscillates between parallel plates. The phenomenon of forced diffusion consists of simultaneous convection and diffusion of substances in moving fluids, which was first studied by G.I. Taylor. As shown by Taylor the phenomenon of forced diffusion can be used as a method for determining the diffusion coefficient of substances in viscous fluids and has great importance in physiology, for the circulatory and pulmonary system of organisms and of course the humans. The phenomenon of forced diffusion has applications in modern medical science, mainly by introducing high-frequency ventilators. In addition, measurements of the speed of blood which are based on the time required to transfer a substance from one point of an artery or vein to another, are based on the theoretical study of this phenomenon. In the first chapter we present some of the most important experimental studies the phenomenon. The second chapter is a reference to Taylor’s theory for the case of dispersion of a substance in Newtonian fluid, moving with steady flow in a cylindrical pipe. Then, we present Watson’s work which studied the oscillatory flow of a Newtonian fluid in a random cross-section pipe. Chapter three presents general perspectives for modeling the behavior of blood. Also, there is reference to unidirectional shear flows, with which we examine experimentally the properties of fluids. We also analyze the model of Jeffrey’s viscoelasctic fluid for which it is studied in this thesis, the forced dispersion of a substance when it oscillates between parallel plates. We present the calculations and the results and we consider critical for the calculations the parameters ξ,ξ1 and ξ2 in order to have expressions similar to those of Watson, and the charts for the percentage increase in the rate of diffusion. Finally, the Annex presents the calculations which are made for the expressions of the augmented diffusion coefficient Rv and the programs used to calculate the diagrams D1-D16. en
dc.description.statementofresponsibility Νικόλαος Γ. Τσούμας el
dc.format.extent 175 bytes
dc.format.mimetype text/xml
dc.language.iso el en
dc.rights ETDFree-policy.xml en
dc.subject Ιξωδοελαστικό el
dc.subject Αριθμός ελαστικότητας el
dc.subject Ρευστό Jeffre's el
dc.subject Θεωρία Taylor el
dc.subject Θεωρία Watson el
dc.subject Viscoelastic en
dc.subject Deborah number en
dc.subject Taylor en
dc.subject Watson en
dc.subject Jeffrey's en
dc.title Μελέτη Εξαναγκασμένης Διάχυσης σε Ταλαντούμενη Ροή Ιξωδοελαστικού Ρευστού el
dc.type bachelorThesis el (en)
dc.date.accepted 2011-03-09
dc.date.modified 2011-03-15
dc.contributor.advisorcommitteemember Προβατίδης, Χριστόφορος el
dc.contributor.advisorcommitteemember Αναγνωστάκης, Μάριος el
dc.contributor.committeemember Τσαγγάρης, Σωκράτης el
dc.contributor.committeemember Προβατίδης, Χριστόφορος el
dc.contributor.committeemember Αναγνωστάκης, Μάριος el
dc.contributor.department Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Μηχανολόγων Μηχανικών. Τομέας Ρευστών. Εργαστήριο Βιορευστομηχανικής & Βιοϊατρικής Τεχνολογίας el
dc.date.recordmanipulation.recordcreated 2011-03-21
dc.date.recordmanipulation.recordmodified 2011-03-21


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