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Dissertations / Theses on the topic 'Viscoelastic fluid'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sibley, David N. "Viscoelastic flows of PTT fluid." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518114.

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2

Johnson, Mitchell A. "Viscoelastic Roll Coating Flows." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/JohnsonMA2003.pdf.

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3

DI, IORIO ELENA. "Splash singularities for viscoelastic fluid models." Doctoral thesis, Gran Sasso Science Institute, 2018. http://hdl.handle.net/20.500.12571/9689.

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4

Vallejo, Juan Pablo Aguayo. "Prediction of viscoelastic fluid flow in contractions." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42918.

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5

Meng, Sha. "A spectral element method for viscoelastic fluid flow." Thesis, De Montfort University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369907.

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6

RACHID, FELIPE BASTOS DE FREITAS. "TRANSIENTS IN FLUID AND STRUCTURE IN VISCOELASTIC TUBES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1989. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33257@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Neste trabalho, a interação fluido-estrutura é analisada em sistemas de tubulações transportando líquidos, considerando-se que o material dos tubos apresenta comportamento mecânico linear viscoelástico. São investigados, teoricamente, os efeitos do movimento da tubulação nas respostas transientes de pressão no líquido e tensão na estrutura quando se induz, através do fechamento rápido de válvulas ou ação de uma força de impacto sobre a tubulação, um estado de desequilíbrio no sistema. Na análise, considera-se o processo de propaga

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7

Götz, Dario [Verfasser]. "Three topics in fluid dynamics: Viscoelastic, generalized Newtonian, and compressible fluids / Dario Götz." München : Verlag Dr. Hut, 2012. http://d-nb.info/1029400113/34.

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8

Zhang, Xueyan. "Mechanics of viscoelastic mud under water waves." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36710003.

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9

Zhang, Xueyan, and 張雪岩. "Mechanics of viscoelastic mud under water waves." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36710003.

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The Best M.Phil Thesis in the Faculties of Dentistry, Engineering, Medicine and Science (University of Hong Kong), Li Ka Shing Prize,2005-2006<br>published_or_final_version<br>abstract<br>Mechanical Engineering<br>Master<br>Master of Philosophy

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10

Budu, Paula. "Conditional and unconditional nonlinear stability in fluid dynamics." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/3938/.

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In this thesis we examine some of the interesting aspects of stability for some convection problems. Specifically, the first part of the thesis deals with the Bénard problem for various Non-Newtonian fluids, whereas the second part develops a stability analysis for convection in a porous medium. The work on stability for viscoelastic fluids includes nonlinear stability analyses for the second grade fluid, the generalised second grade fluid, the fluid of dipolar type and the fluid of third grade. It is worth remarking that throughout the work the viscosity is supposed to be any given function o

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11

Yi, Wei. "Cartesian grid methods for viscoelastic fluid flow in complex geometry." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/cartesian-grid-methods-for-viscoelastic-fluid-flow-in-complex-geometry(57b59bc9-4dc8-4698-a945-fc170c8e56e0).html.

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Viscoelastic fluid flow with immersed boundaries of complex geometry is widely found both in nature and engineering processes. Examples include haemocytes moving in human blood flow, self-propulsion of microscopic organisms in complex liquids, hydraulic fracturing with sand in oil flow, and suspension flow with viscoelastic medium. Computational modelling of such systems is important for understanding complex biological processes and assisting engineering designs. Conventional simulation methods use conformed meshes to resolve the boundaries of complex geometry. Dynamically updating the confor

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12

Sachsenheimer, Dirk [Verfasser], and N. [Akademischer Betreuer] Willenbacher. "Capillary thinning of viscoelastic fluid filaments / Dirk Sachsenheimer. Betreuer: N. Willenbacher." Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1064504191/34.

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13

Sakatani, Yuho. "Relativistic viscoelastic fluid mechanics and the entropic formulation of continuum mechanics." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157762.

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14

Jiao, Li-Fang. "A STUDY ON MICROBUBBLE FLOW BEHAVIORS IN SURFACTANT VISCOELASTIC FLUID FLOW." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174931.

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15

Howell, Jason S. "Numerical approximation of shear-thinning and Johnson-Segalman viscoelastic fluid flows." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1193079507/.

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16

Yoon, Sungho. "An adaptive finite element method for particle suspension in viscoelastic fluid." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.530812.

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17

Ullah, Tania. "Modeling a two-link rigid swimmer scalloping in linear viscoelastic fluid." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40938.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (p. 44).<br>In his renowned lecture on Life at low Reynolds number, E.M. Purcell established that a rigid swimmer comprised of two links cannot swim in a viscous Newtonian fluid due to the reciprocal nature of its movements. Viscoelastic fluid, on the other hand, has a characteristic time scale associated with stress relaxation and can impart asymmetrical stresses on the body of a swimmer to propel it forward. This work focuses on developing a theoretical model fo

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18

Mavi, Anele. "Computational analysis of viscoelastic fluid dynamics with applications to heat exchangers." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/30078.

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In this study, the computational analysis of a pressure driven viscoelastic fluid in a double pipe heat exchanger set-up is investigated. Non-Newtonian viscoelastic fluids in heat exchanger arrangements are encountered in various industrial applications such as power generation, refrigeration and in the food processing industry where the need for cooling and heating of liquids is required. The model problem is governed by complex, non-linear and coupled partial differential equations. These are solved using the semi-implicit finite difference method integrated with the Crank-Nicolson scheme. T

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19

Castillo, del Barrio Ernesto. "Stabilized finite element formulations for the three-field viscoelastic fluid flow problem." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/392717.

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The Finite Element Method (FEM) is a powerful numerical tool, that permits the resolution of problems defined by partial differential equations, very often employed to deal with the numerical simulation of multiphysics problems. In this work, we use it to approximate numerically the viscoelastic fluid flow problem, which involves the resolution of the standard Navier-Stokes equations for velocity and pressure, and another tensorial reactive-convective constitutive equation for the elastic part of the stress, that describes the viscoelastic nature of the fluid. The three-field (velocity-press

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20

Gerritsma, Marcus Iwan. "Time dependent numerical simulations of a viscoelastic fluid on a staggered grid." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1996. http://irs.ub.rug.nl/ppn/148605494.

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21

Szady, Michael Joseph. "Finite element methods for the time dependent simulation of viscoelastic fluid flows." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10914.

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22

Xue, Shicheng. "Three dimensional finite volume modelling and numerical simulations of viscoelastic fluid flows." Thesis, The University of Sydney, 1997. https://hdl.handle.net/2123/27634.

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This study focuses on developing an efficient, fully three dimensional Finite Volume Method for viscoelastic fluid flow problems, and on numerical investigations of some complex rheological phenomena.

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23

Ban, Mohammad Javad. "Numerical study of filament-stretching and step-strain in viscoelastic fluid flows." Thesis, Swansea University, 2007. https://cronfa.swan.ac.uk/Record/cronfa42333.

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This thesis is concerned with the numerical prediction of two-dimensional viscoelastic filaments under stretching and step-strain within cylindrical-like domains. A hybrid finite element/finite volume (fe/fv) scheme has been implemented in this study to solve the governing equations (mass and momentum conservation and constitutive model). A time-stepping procedure is utilised in the fe/fv algorithm. A number of rheological models have been employed to stimulate the desired rheological response. Amongst these is the Oldroyd-B model. This is considered as a strong strain-hardening model being wi

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24

Kamal, Ibrahim Abdelhamid Hossam. "Numerical prediction of a viscoelastic fluid flow past a non-confined cylinder." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10018/document.

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Ce travail a pour principal objectif la prédiction numérique de l'écoulement laminaire bidimensionnel d'un fluide viscoélastique autour d'un cylindre en milieu non confiné. La méthode des volumes finis en coordonnées orthogonales généralisées est ici adoptée pour résoudre les équations de conservation. Le modèle constitutif pour le fluide est de type Phan-Tien Tanner simplifié (S-PTT). Afin de stabiliser l'algorithme de résolution, le schéma dit "Elastic Viscous Split Stresses" (EVSS) est utilisé. Le code de calcul mis au point a été validé dans le cas de l'écoulement newtonien. Les résultats

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25

Kamal, Ibrahim Abdelhamid Hossam. "Numerical prediction of a viscoelastic fluid flow past a non-confined cylinder." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10018.

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Ce travail a pour principal objectif la prédiction numérique de l'écoulement laminaire bidimensionnel d'un fluide viscoélastique autour d'un cylindre en milieu non confiné. La méthode des volumes finis en coordonnées orthogonales généralisées est ici adoptée pour résoudre les équations de conservation. Le modèle constitutif pour le fluide est de type Phan-Tien Tanner simplifié (S-PTT). Afin de stabiliser l'algorithme de résolution, le schéma dit "Elastic Viscous Split Stresses" (EVSS) est utilisé. Le code de calcul mis au point a été validé dans le cas de l'écoulement newtonien. Les résultats

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26

Chadwick, Kenneth Michael. "An experimental investigation of the breakup of a viscoelastic non-newtonian fluid in a supersonic stream." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42082.

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27

Bentata, Omar. "Étude expérimentale d'un anneau tourbillonnaire en fluide newtonien et non newtonien en régime faiblement inertiel." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/9703/1/bentata.pdf.

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Cette thèse est une étude expérimentale de la formation et de la maturation d’un anneau tourbillonnaire. Elle porte sur les écoulements faiblement inertiels (Reynolds : 5 à 500) en fluide newtonien puis non newtonien. Les anneaux sont générés par un système cylindre-piston. Ils sont analysés par visualisation et par vélocimétrie par images de particules (PIV). La dynamique en fluide newtonien à faible nombre de Reynolds se révèle plus complexe que celle à grands Reynolds avec l’apparition d’un anneau secondaire contrarotatif. Les résultats obtenus en fluide rhéofluidifiant montrent l’influence

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28

Gaillard, Antoine. "Flow and stability of a viscoelastic liquid curtain." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC011/document.

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L’écoulement et la stabilité des rideaux liquides viscoélastiques sont étudiés pour des solutions de polymères flexibles et semi rigides. Ces liquides viscoélastiques sont extrudés à partir d’une fente à débit constant et s’écoulent à l’air libre sous l’effet de la gravité. L’écoulement de ces liquides se caractérise par un équilibre initial entre la gravité et les forces élastiques causées par les déformations des chaînes de polymère, jusqu’à ce que l’inertie du liquide finisse par dominer et que l’on retrouve le comportement classique de chute libre. Nous montrons que l’écoulement est princi

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29

Savel'ev, Evgeny. "Controllability of the Stresses in Multimode Viscoelastic Fluid of Upper Convected Maxwell Type." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28181.

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Viscoelastic fluids, or Non-Newtonian fluids, are those that do not have a linear algebraic relation between the velocity field and the stresses arising in the media. Such fluids exhibit properties of both solids and liquids, and therefore cannot be modeled with methods of elasticity or Newtonian fluid mechanics. The popular models of viscoelasticity differ from each other only by the differential equation that describes the constitutive law for the fluid. Also, the media can have several relaxation modes, such as fluid mixes. This means that the stresses are determined as the sum of the stres

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30

Goddard, Chris. "Rheological chaos and elastic turbulence in a generalised Maxwell model for viscoelastic fluid flow." Thesis, University of Surrey, 2008. http://epubs.surrey.ac.uk/2773/.

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This work presents a new extension to a generalised nonlinear Maxwell model for the theoty of viscoelastic material flow. Nonlinear terms within this constitutive model are used to replicate many experimental phenomena such as shear-thickening/thinning, shear banding and dynamic stress responses found in complex materials such as polymers, Micelles, colloidal dispersions and even granular media. Numerical simulations of the stress tensor under spatially homogeneous plane Couette flow reveal a range of solutions from steady state to chaotic, chosen in part by the strength of nonlinear terms. Bi

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31

Stone, Thomas Shannon. "A numerical/experimental method for evaluating the bulk and shear complex dynamic moduli of viscoelastic polymers in the kilohertz range." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17038.

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32

Mullaert, Jimmy. "Numerical methods for incompressible fluid-structure interaction." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066683/document.

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Cette thèse présente une famille de schémas explicites pour la résolution d'un problème couplé d'interaction entre un fluide visqueux incompressible et une structure élastique (avec possiblement un comportement visco-élastique et/ou non linéaire). La principale propriété de ces schémas est une condition de Robin consistante à l'interface, qui représente une caractéristique fondamentale du problème continu dans le cas où la structure est mince. Si le couplage s'effectue avec une structure épaisse, une condition de Robin généralisée peut être formulée pour le problème semi-discret en espace, à l

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33

Lima, Nicolao Cerqueira 1985. "Simulação de escoamentos eletrohidrodinâmicos de fluidos newtonianos e viscoelásticos." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263465.

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Orientador: Marcos Akira d'Ávila<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-22T01:11:51Z (GMT). No. of bitstreams: 1 Lima_NicolaoCerqueira_M.pdf: 2608433 bytes, checksum: 1f09fc99d86a78b7861be6972463c29c (MD5) Previous issue date: 2013<br>Resumo: A eletrohidrodinâmica trata basicamente dos efeitos de um campo elétrico em meios contínuos. Um fluido sob o efeito de um campo elétrico tende a se deformar devido a uma força elétrica que age sobre ele. Essa força elétrica é consequência de alguns fatores qu

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34

Karra, Satish. "Modeling electrospinning process and a numerical scheme using Lattice Boltzmann method to simulate viscoelastic fluid flows." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1347.

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35

Grant, Holly Victoria. "A viscoelastic constitutive model for thixotropic yield stress fluids: asymptotic and numerical studies of extension." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/80440.

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This dissertation establishes a mathematical framework for analyzing a viscoelastic model that displays thixotropic behavior as a model parameter gets very small. The model is the partially extending strand convection model, originally derived for polymeric melts that have long strands that get in the way of fully retracting. A Newtonian solvent is added. The uniaxial and equibiaxial extensional flows are studied using combined asymptotic analysis and numerical simulations. An initial value problem with a prescribed elongational stress is solved in the limit of large relaxation time. This give

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36

Martins, Ramon Silva. "Numerical simulation of turbulent viscoelastic fluid flows : flow classification and preservation of positive-definiteness of the conformation tensor." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10127/document.

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Le but de ce travail est de fournir une amélioration de la connaissance sur le phénomène de la réduction de la traînée induite par polymère en considérant certains aspects de sa simulation numérique et les changements qui se produisent dans la cinématique de l’écoulement. Dans un premier temps, les transformations du type racine carrée et kernel racine-k pour le tenseur de conformation du modèle FENE-P ont été implémentées afin d’assurer la positivité du tenseur de conformation. Cependant, ces approches divergent en raison du caractère non-borné du tenseur de conformation. Cette contrainte n’a

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37

Nicknich, Gustavo. "Análise do desempenho numérico do Solver viscoelasticFluidFoam." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/103718.

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Polímeros sintéticos ocupam uma posição de grande importância no estilo de vida moderno, servindo como matérias-primas para a construção de uma variedade de utensílios. Apesar do grande número de operações de processamento e produtos disponíveis, o planejamento de produtos e a otimização dos processos de produção raramente constituem-se de tarefas triviais. Isso deve-se ao fato da maioria das operações aplicadas na indústria de processamento de polímeros envolverem geometrias e padrões de escoamento complexos, além da dificuldade intrínseca relacionada ao comportamento reológico complexo de po

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38

Laadj, Toufik. "Initial Value Problems for Creeping Flow of Maxwell Fluids." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/26302.

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We consider the flow of nonlinear Maxwell fluids in the unsteady quasistatic case, where the effect of inertia is neglected. We study the well-posedness of the resulting PDE initial-boundary value problem. This well-posedness depends on the unique solvability of an elliptic boundary value problem. We first present results for the 3D case, locally and globally in time, with sufficiently small initial data, and for a simple shear flow problem, locally in time with arbitrary initial data; after that we extend our results to some 3D flow problems, locally in time, with large initial data. Addition

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39

Curtis, Mark Peter. "Aspects of low Reynolds number microswimming using singularity methods." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:13dcb39b-f5b7-4d46-92d4-21a9afbecd08.

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Three different models, relating to the study of microswimmers immersed in a low Reynolds number ﬂuid, are presented. The underlying, mathematical concepts employed in each are developed using singularity methods of Stokes ﬂow. The ﬁrst topic concerns the motility of an artiﬁcial, three-sphere microswimmer with prescribed, non-reciprocal, internal forces. The swimmer progresses through a low Reynolds number, nonlinear, viscoelastic medium. The model developed illustrates that the presence of the viscoelastic rheology, when compared to a Newtonian environment, increases both the net displacemen

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40

Prabhakar, Vivek. "Least squares based finite element formulations and their applications in fluid mechanics." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1152.

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41

Mehra, Puneet. "Fluid-Structure Interaction Modeling of Human Upper Airway Collapse in Obstructive Sleep Apnea." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563873512457421.

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42

BERTAGLIA, Giulia. "1D augmented fluid-structure interaction systems with viscoelasticity: from water pipelines to blood vessels." Doctoral thesis, Università degli studi di Ferrara, 2020. http://hdl.handle.net/11392/2488143.

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Nowadays, mathematical models and numerical simulations are widely used in the whole fluid dynamics research field. They represent a powerful resource to better understand phenomena and processes and to significantly reduce the costs that would otherwise be necessary for carrying out laboratory experiments (sometimes even allowing to obtain useful data that could not be collected by measurements). Currently there are many important industries of hydraulic systems which, for the correct analysis of the behavior of the designed systems, require the preventive use of an accurate mathematical mode

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43

Westervoß, Patrick [Verfasser], Stefan [Akademischer Betreuer] Turek, and Christian [Gutachter] Kreuzer. "The Tensor Diffusion approach as a novel technique for simulating viscoelastic fluid flows / Patrick Westervoß ; Gutachter: Christian Kreuzer ; Betreuer: Stefan Turek." Dortmund : Universitätsbibliothek Dortmund, 2021. http://d-nb.info/1230628711/34.

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44

Figueiredo, Rafael Alves. "Simulação numérica de escoamentos viscoelásticos multifásicos complexos." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-30112016-160821/.

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Aplicações industriais envolvendo escoamentos multifásicos são inúmeras, sendo que, o aprimoramento de alguns desses processos pode resultar em um grande salto tecnológico com significativo impacto econômico. O estudo numérico dessas aplicações é imprescindível, pois fornece informações precisas e mais detalhadas do que a realização de testes experimentais. Um grande desafio é o estudo numérico de escoamentos viscoelásticos multifásicos envolvendo altas taxa de elasticidade, devido às instabilidades causadas por altas tensões elásticas, grandes deformações, e até mudanças topológicas na interf

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45

Martins, Adam Macedo. "Análise da qualidade de tensões obtidas na simulação de escoamentos de fluidos viscoelásticos usando a formulação log-conformação." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/156814.

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Uma das mais recentes abordagens propostas na literatura para tratar o problema do alto número de Weissenberg (We) é a Formulação Log-Conformação (FLC). Nesta formulação, a equação constitutiva viscoelástica utilizada é reescrita em termos de uma variável Ψ, que é o logaritmo do tensor conformação. Apesar do potencial de aplicação da FLC, pouca atenção tem sido dirigida para análise da acurácia da solução obtida para o campo de tensões quando se utiliza esta formulação. Assim, o objetivo do presente trabalho foi estudar a acurácia da solução obtida pela FLC na análise de escoamentos de fluidos

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46

Thatte, Azam. "Multi-scale multi-physics model and hybrid computational framework for predicting dynamics of hydraulic rod seals." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37272.

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Rod seals are one of the most critical components of hydraulic systems. However, the fundamental physics of seal behavior is still poorly understood and the seal designers have virtually no analytical tools with which to predict the behavior of potential seal designs. In pursuit of a comprehensive physics based seal analysis/ design tool, in this work, a multi-scale multi-physics (MSMP) seal model is developed. The model solves the transient problem involving macro-scale viscoelastic deformation mechanics, macro-scale contact, micro-scale two phase fluid mechanics in the sealing zone, micro-sc

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47

Deblock, Yves. "Caractérisation ultrasonore haute fréquence des propriétés viscoélastiques de milieux liquides." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/d2e436b7-2cfd-4b8b-9ff8-9e725f939e0a.

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Les modules de compression et de rigidité constituent des paramètres macroscopiques, caractéristiques des matériaux homogènes, linéaires et isotropes. Nous proposons, dans ce travail, deux méthodes acoustiques, originales et complémentaires, applicables aux matériaux liquides, qui permettent leur détermination dans le domaine haute fréquence. La première méthode est basée sur le traitement de l'impédance électrique d'entrée d'un capteur à onde de cisaillement, place au contact du matériau liquide étudié. Ce traitement permet d'extraire le coefficient de réflexion a l'interface entre les matéri

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Revoredo, Igor Feliciano Simplicio. "Solução Numérica de escoamentos viscoelásticos tridimensionais com superfícies livres: fluidos de segunda ordem." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-18052010-161846/.

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Abstract:

Este trabalho apresenta uma técnica de diferenças finitas para resolver a equação constitutiva Fluido de Segunda Ordem para escoamentos tridimensionais com superfície livre. As equações governantes são resolvidas pelo método de diferenças finitas em uma malha deslocada 3D. A superfície livre é modelada por células marcadoras (Marker-and-Cell) e as condições de contorno a superfície livre são empregadas. O método numérico apresentado neste trabalho foi validado pela comparação entre as soluções numéricas obtidas para o escoamento em um tubo com a solução analítica correspondente para Fluidos de

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49

Ramsay, John Andrew. "Mixing of viscoelastic fluids." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7333/.

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Abstract:

This work investigates the laminar mixing performance of viscoelastic fluids in laboratory-scale batch stirred tanks agitated by “butterfly” impellers and in-line Kenics KM static mixers. Constant-viscosity viscoelastic (Boger) fluids were formulated to investigate viscous and elastic effects separately; multiphase viscoelastic suspensions were formulated from 40-50 volume% glass spheres in glycerol. Particle Image Velocimetry in stirred tanks agitated by high impeller-to-tank diameter ratio butterfly impellers (D/T=0.98) showed that secondary flows in Boger fluid increased solid body rotation

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50

Mouline, Youssef. "Dynamique des bulles de gaz dans les milieux rhéologiquement complexes." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL063N.

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Abstract:

Dans les procédés gaz-liquide, l'efficacité des transferts de matière et de chaleur est essentiellement contrôlée par la dynamique des bulles dans la phase liquide. L’étude du comportement des bulles de gaz dans un milieu liquide est donc d'un intérêt certain, tant sur le plan fondamental que sur le plan industriel, surtout lorsque le milieu liquide est non-newtonien. Notre étude a révélé que les propriétés rhéologiques de la phase liquide et la fréquence d'injection du gaz dans la colonne ont une influence importante sur la vitesse d'ascension des bulles. Dans les milieux viscoélastiques, des

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