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Dissertations / Theses on the topic 'Dispersed phase'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kemiklioglu, Emine. "Polymer Stabilized and Dispersed Blue Phases." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1409153158.

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2

Hill, David Paul. "The computer simulation of dispersed two-phase flow." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8733.

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3

Lee, Woo Young. "Chemical vapor deposition of dispersed phase ceramic composites." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/11857.

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4

Haidemenopoulos, Gregory N. "Dispersed-phase transformation toughening in ultrahigh-strength steels." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14564.

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5

Ngan, K. H. "Phase inversion in dispersed liquid-liquid pipe flow." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1318099/.

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This thesis presents the experimental and theoretical investigations on the development of phase inversion in horizontal pipeline flow of two immiscible liquids. It aims to provide an understanding on the flow development across the phase inversion transition as well as the effect on pressure drop. Experimental investigation on phase inversion and associated phenomena were conducted in a 38mm I.D. liquid pipeline flow facility available in the Department of Chemical Engineering at University College London (UCL). Two sets of test pipelines are constructed using stainless steel and acrylic. The

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6

Zhou, Jianyu. "Applications of Dispersed Phase Flows Through Porous Media." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1542106409444557.

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7

Rusche, Henrik. "Computational fluid dynamics of dispersed two-phase flows at high phase fractions." Thesis, Imperial College London, 2003. http://hdl.handle.net/10044/1/8110.

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8

Varone, Anthony F. (Anthony Francis). "The influence of the dispersed phase on the convective heat transfer in dispersed flow film boiling." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13996.

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9

Govan, Alastair Hamilton. "Modelling of vertical annular and dispersed two-phase flows." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/8778.

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10

Deshpande, Kiran B. "Study of transport limited heterogeneous reaction in the dispersed phase." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419600.

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11

Prasertmanukitch, Sitas. "Dispersed phase adsorbents : a study of their properties and behaviour." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247501.

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12

Ioannou, Karolina. "Phase inversion phenomenon in horizontal dispersed oil/water pipeline flows." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445603/.

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This thesis reports on experimental and theoretical investigations relevant to the understanding of the phenomenon of phase inversion and its effect on pressure drop during dispersed flow of two immiscible liquids in horizontal pipelines. Experimental studies of phase inversion and associated phenomena were carried out in the liquid flow facility in the Department of Chemical Engineering at University College London (UCL), and at the Norwegian University of Science and Technology, Trondheim, Norway (NTNU). Detailed local conductivity measurements have been obtained at UCL (using conductivity r

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13

Jaye, Andrew Anthony. "Ultrafast dynamics in the dispersed phase of oil-in-water microemulsions." Thesis, University of East Anglia, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410121.

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14

Abrishami-Savjublagh, Yoseph. "Numerical computations of dispersed flow and gravity stratified two-phase flow." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47736.

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15

Chen, Lu Guang, and s3064076@student rmit edu au. "Thermo-Optical Properties of Polymer Dispersed Liquid Crystals." RMIT University. Applied Science, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080206.114823.

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Polymer dispersed liquid crystal (PDLC) films, consisting of micro-sized domains of a liquid crystal dispersing in a polymer matrix, serve as the basis of a variety of high-efficiency electro-optical effects. The thermo-optical properties of the PDLCs were investigated in this thesis. The thermal properties and the morphologies of four low molar mass mesogens were studied by DSC and polarized optical microscope (POM). There were significant super cooling/heating effects on the first order phase transitions but not on the mesophase transitions. The structural effects on the transition tempera

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16

Guðmundsson, Reynir Leví. "A numerical study of two-fluid models for dispersed two-phase flow." Doctoral thesis, KTH, Numerical Analysis and Computer Science, NADA, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132.

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<p>In this thesis the two-fluid (Eulerian/Eulerian) formulation for dispersed two-phase flow is considered. Closure laws are needed for this type of models. We investigate both empirically based relations, which we refer to as a nongranular model, and relations obtained from kinetic theory of dense gases, which we refer to as a granular model. For the granular model, a granular temperature is introduced, similar to thermodynamic temperature. It is often assumed that the granular energy is in a steady state, such that an algebraic granular model is obtained. </p><p>The inviscid non-granular mod

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17

Gudmundsson, Reynir Levi. "A numerical study of two-fluid models for dispersed two-phase flow." Doctoral thesis, KTH, Numerisk Analys och Datalogi, NADA, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132.

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In this thesis the two-fluid (Eulerian/Eulerian) formulation for dispersed two-phase flow is considered. Closure laws are needed for this type of models. We investigate both empirically based relations, which we refer to as a nongranular model, and relations obtained from kinetic theory of dense gases, which we refer to as a granular model. For the granular model, a granular temperature is introduced, similar to thermodynamic temperature. It is often assumed that the granular energy is in a steady state, such that an algebraic granular model is obtained. The inviscid non-granular model in one

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18

Akritopoulos, Michail. "Combustion modelling of dispersed two-phase flows, applied in circulating fluidised beds." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414215.

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19

Mercier, David. "Large eddy simulation of coupled dispersed phase flows : a statistically-consistent formalism." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC022.

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La simulation de sprays de carburant aux gouttes de taille variée est d’importance primordiale pour reproduction fidèle du comportement des moteurs aéronautiques. À cette fin, les méthodes de moment eulériennes offrent une stratégie intéressante car elles représentent des statistiques convergées. Ces méthodes ont déjà été utilisées avec succès pour reproduire des tendances macroscopiques telles que la forme de la flamme. Il reste toutefois de nombreux challenges à relever afin d’améliorer leur niveau de précision et de prédiction.Parmi ces challenges, le couplage réciproque entre le spray et l

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20

JUSTICE, RYAN SCOTT. "INTERFACE MORPHOLOGY AND PHASE SEPARATION IN POLYMER DISPERSED LIQUID CRYSTAL (PDLC) COMPOSITES." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163783056.

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21

Pullum, Olwen J. "The fabrication and analysis of hard, Siâ†3Nâ†4-based, dispersed phase composites." Thesis, University of Warwick, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357793.

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22

Lad, Bharat. "A computational method for simulating dispersed two-phase flows using the PDF approach." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6030.

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The thesis presents a Probability Density Function (PDF)-derived Eulerian/Eulerian model for the prediction of dispersed two-phase (solid/gas) flows. Continuum equations for the dispersed phase are formulated from the Kinetic Model (KM) PDF transport equations. The Kinetic stresses of the dispersed phase are determined from an algebraic stress model (ASM) together with a KM-based transport equation for the fluctuating kinetic energy. The continuum equations for the continuous phase are assumed to be the same as those in the Eulerian two-fluid model except for the interfacial momentum and energ

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23

Gudmundsson, Reymir Levi. "On stability of solutions to the two-fuid models for dispersed two-phase flow." Licentiate thesis, KTH, Numerical Analysis and Computer Science, NADA, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1503.

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<p>In this thesis the two-fluid (Eulerian/Eulerian) formulationfor dispersed two-phase flow is considered. The inviscidformulation in one space dimension is known to be conditionallywell-posed. On the other hand the viscous formulation islocally in time well-posed for smooth initial data, but with amedium to high wave number instability. In this study weconsider two issues.</p><p>First, we study the long time behavior of the viscous modelin one space dimension, where we rely on numerical experiments.We try to regularize the problem in a standard way. Thesimulations suggest that it is not possi

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24

Back, Alan Joseph. "Mass transfer and radical flux effects in dispersed-phase polymerization of highly hydrophobic monomers." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/11295.

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25

Loison, Arthur. "Unified two-scale Eulerian multi-fluid modeling of separated and dispersed two-phase flows." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAX009.

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Les écoulements diphasiques liquide-gaz sont présents dans de nombreuses applications industrielles telles que la propulsion aérospatiale, l'hydraulique nucléaire ou les colonnes à bulles dans l'industrie chimique.La simulation de ces écoulements est d'un intérêt primordial pour leur compréhension et leur optimisation.Cependant, la dynamique de l'interface séparant le gaz du liquide peut avoir une dynamique multi-échelle et rend alors sa simulation trop coûteuse en calcul dans un contexte industriel.Une classe de modèles - dits multi-fluides - sont moins coûteux pour des régimes particuliers d

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26

Rius, i. Riu Jaume. "Gas phase molecular relaxation probed by synchrotron radiation experiments." Doctoral thesis, KTH, Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3411.

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<p>This thesis presents experimental studies of gas phasemolecular relaxation after excitation with synchrotron photonsin the 15-35 eV and in the 70-350 eV regions.</p><p>In the 15-35 eV region, molecular relaxation by neutraldissociation processes and non</p><p>Franck-Condon effects in N2 and O2 molecules have beenstudied by means of dispersed fluorescence and photoelectronspectroscopy experimental techniques, respectively. From thedispersed fluorescence data, excitation functions for themeasured atomic fluorescence spectra have been obtained. Fromthe recorded photoelectron spectra vibrationa

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27

Albertsson, Galina. "Effect of the presence of a dispersed phase (solid particles, gas bubbles) on the viscosity of slag." Thesis, KTH, Mikro-modellering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133495.

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The viscosities of a set of silicone oils containing different size ranges of charcoal or paraffin particles as well as the viscosities of silicone oil foams were measured at room temperature in order to determine the effect of dispersed phase on the viscosity of a liquid and its effect on foaming ability. The effective viscosity of the samples increased with volume fraction of the second phase. The foaming ability was improved by the presence of the particles. The improved foaming effect was for the most part not a result of the increased viscosity. No connection between the particle size and

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28

Moss, Thomas Strong III. "The chemical vapor deposition of dispersed phase composites in the B-Si-C-H-Cl-Ar system." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/19040.

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29

Cho, Yong Gyun 1965. "The effect of concentration of the dispersed phase on morphology evolution in high viscosity ratio polymer blends /." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38471.

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In order to obtain some insight into the deformation behavior of the dispersed phase in the various flows and to evaluate the effects of various variables such as concentration of the dispersed phase and viscosity ratio, affine deformation equations were derived for some stratified shear and elongational flows. It was shown by the derived deformation equations that the volume fraction of the dispersed phase is a factor affecting the deformation of the dispersed phase, and the effect depends on viscosity ratio. The results from the stratified simple shear flow model predict that, for viscosity

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30

Shah, Anant Pankaj. "Development and application of a dispersed two-phase flow capability in a general multi-block Navier Stokes solver." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36101.

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Gas turbines for military applications, when operating in harsh environments like deserts often encounter unexpected operation faults. Such performance deterioration of the gas turbine decreases the mission readiness of the Air Force and simultaneously increases the maintenance costs. Some of the major factors responsible for the reduced performance are ingestion of debris during take off and landing, distorted intake flows during low altitude maneuvers, and hot gas ingestion during artillery firing. The focus of this thesis is to study ingestion of debris; specifically sand. The region of int

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31

Dimitrova, Desislava Nikolova [Verfasser], Johannes [Akademischer Betreuer] Janicka, and Peter [Akademischer Betreuer] Stephan. "On the Reliability of Large-Eddy Simulation for Dispersed Two-Phase Flows / Desislava Nikolova Dimitrova. Betreuer: Johannes Janicka ; Peter Stephan." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2011. http://d-nb.info/1105562336/34.

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32

Fintzi, Nicolas. "Statistical modeling of disperse two-phase ﬂows : application to buoyancy-driven droplets suspensions". Electronic Thesis or Diss., Sorbonne université, 2025. http://www.theses.fr/2025SORUS057.

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Les écoulements de gouttes entraînés par la flottabilité se rencontrent dans de nombreux procédés de génie chimique, tels que les séparateurs gravitaires et les extracteurs liquide-liquide. Ces systèmes présentent une large gamme d'échelles, allant de la taille des inclusions individuelles (aussi petites que quelques micromètres) à celle des réacteurs (souvent supérieure à un mètre), ce qui rend les simulations entièrement résolues impossibles à réaliser avec les ressources informatiques actuelles. Par conséquent, les pratiques actuelles de modélisation reposent sur l'utilisation des équations

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33

Gotteland, Delphine. "Procédé d’hydroconversion par catalyse dispersée des résidus lourds pétroliers." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10198.

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34

Gardner, Taylor. "Study of Water Wetting in Two-Phase Oil-Water Flow in an Annular Channel." Ohio University Honors Tutorial College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1524844271362932.

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35

Albarzenji, Dlir. "Design, development and application of a novel seven-sensor probe system for the measurement of dispersed phase flow properties in multiphase flows." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34657/.

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Local measurements of the dispersed phase properties in air-water bubbly flows are of primary importance to understand the hydrodynamic characteristics of multiphase flows. One of the essential requirements in designing multiphase flow systems is to determine its flow regime since many constitutive models are flow regime dependent. In bubbly multiphase flow, the bubble diameter plays a vital role in hydrodynamics of flow. In this study, a novel invasive measuring instrumentation system has been designed and developed to determine the bubble size and shape accurately by minimising the effects o

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36

Dehghani, Kiadehi Atena. "Development of a new technique for determining the RTD of a dispersed solid phase and its application in a deep fluidized bed." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2491.

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L'objectif de cette thèse est le développement d’une nouvelle technique expérimentale de détermination de la distribution des temps de séjour (DTS) des particules solides dans les enceintes de manutention et de transformation de solides particulaires ainsi que le développement d’un modèle. Dans un premier temps, une nouvelle méthode optique a été développée pour mesurer la DTS des particules. Les expériences sont réalisées avec le carbure de silicium (SiC) et le pigment phosphorescent (Lumilux® Green SN-F50 WS) a été utilisé en tant que traceur. Une étude expérimentale préliminaire a été réali

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37

Le, Touze Clément. "Couplage entre modèles diphasiques à « phases séparées » et à « phase dispersée » pour la simulation de l’atomisation primaire en combustion cryotechnique." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4088/document.

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Les écoulements diphasiques jouent un rôle prépondérant dans les moteurs-fusées à ergols liquides cryogéniques, équipant par exemple les lanceurs de la famille Ariane. L'étude expérimentale de tels engins propulsifs étant complexe et onéreuse, disposer d'outils numériques à même de simuler fidèlement leur fonctionnement se révèle être un objectif aussi important qu'ambitieux. La difficulté majeure réside dans le caractère fortement multi-échelles du problème, si bien qu’aucune approche numérique existante n'est capable à elle seule de décrire parfaitement l'ensemble des échelles liquides. Part

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38

Pushparajalingam, Jegan Sutharsan. "Simulations expérimentale et numérique des phénomènes de ruissellement et d’atomisation lors d’une procédure de lavage à l’eau." Thesis, Toulouse, ISAE, 2012. http://www.theses.fr/2012ESAE0005/document.

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Celui-ci a pour objectif de valider l'ensemble des modèles physiques utilisés dans un code de simulation numérique pour simuler un écoulement de type annulaire dispersé en conduite rencontré lors d'une procédure de lavage à eau utilisé dans les raffineries. Pour ce faire une banque de données expérimentale est mise en place sur des configurations représentatives de celles utilisées en condition industrielle. La géométrie retenue comporte une zone horizontale d'injection rectiligne avec un injecteur central, suivi d'un coude à 90° situé dans un plan vertical. Différentes conditions expérimental

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39

Echeverri, Mauricio. "Phase Diagram Approach to Fabricating Electro-Active Flexible Films: Highly Conductive, Stretchable Polymeric Solid Electrolytes and Cholesteric Liquid Crystal Flexible Displays." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1352949368.

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40

Keita, Sana. "Eulerian Droplet Models: Mathematical Analysis, Improvement and Applications." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37907.

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The Eulerian description of dispersed two-phase flows results in a system of partial differential equations describing characteristics of the flow, namely volume fraction, density and velocity of the two phases, around any point in space over time. When pressure forces are neglected or a same pressure is considered for both phases, the resulting system is weakly hyperbolic and solutions may exhibit vacuum states (regions void of the dispersed phase) or localized unbounded singularities (delta shocks) that are not physically desirable. Therefore, it is crucial to find a physical way for pr

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41

Farrar, B. "Hot-film anemometry in dispersed oil-water flows : Development of a hot-film anemometer based measurement technique for detailed studies of complex two-phase flows and its application.........bubbly water-kerosene and water-air flows." Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234685.

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42

Hantz-Brachet, Edith. "Etude d'émulsions et de vésicules unilamellaires d'intérêt biologique ou pharmaceutique par diffusion quasiélastique de la lumière et spectroscopie vibrationnelle." Paris 13, 1989. http://www.theses.fr/1989PA132009.

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43

Guibu, Pereira Gabriel. "Modélisation numérique d'écoulements turbulents avec entraînement d'air au sein d'ouvrages hydrauliques." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAD023.

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La dispersion de l'air dans l'eau est un phénomène observé fréquemment pour une large variété , d'écoulements dans des structures hydrauliques, qu'elles soient naturelles ou conçues par l'homme. Or, la présence de bulles d'air immergées dans l'eau modifie de façon significative les caractéristiques de l'écoulement. Ces modifications peuvent être bénéfiques ou nuisibles selon la situation. En particulier, dans le contexte des milieux confinés des réseaux d'eaux urbains, l'évaluation du transport d'air est un facteur important pour le dimensionnement des ouvrages, tels que les puits de chute. Le

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44

Jager, Lezer Nathalie. "Caracterisations rheologiques de systemes disperses d'interet cosmetique : correlation avec la microstructure." Paris 11, 1998. http://www.theses.fr/1998PA114813.

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45

Mukhopadhyay, Amartya. "Fabrication and properties of oxide nanocomposites containing uniformly dispersed second phases." Thesis, University of Oxford, 2009. https://ora.ox.ac.uk/objects/uuid:094c8b45-49b8-4518-8257-c1fd3ebbd8b2.

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The present research addresses some of the major problems pertaining to two different types of ceramic nanocomposite; viz. participate reinforced polycrystalline alumina-based nanocomposites and multiwalled carbon nanotube (MWCNT) reinforced aluminoborosilicate glass/ceramic (ABS) nanocomposites. With respect to the former, a novel and economical processing route based upon solid solution-precipitation technique is explored. Dense and homogeneous solid solutions of 10 wt.% Fe<sub>2</sub>O<sub>3</sub> in Al<sub>2</sub>O<sub>3</sub> were produced by pressureless sintering at 1450°C in air. Aging

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46

Elsden, M. "A transport model for dispersed two - phased flows : development and implementation." Thesis, Cranfield University, 1995. http://hdl.handle.net/1826/3963.

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Two-phase flows are found in many industrial and natural processes, from the combustion chambers of aero-engines to silt transport in rivers. The interaction between the two, or more, phases is extremely complex and is not amenable to analytical solution. Though equations exist to describe the behaviour of each of the phases, the direct solution of these equations, for all but the simplest flows, is beyond current computer power. Because of this much work is being done to develop computationally tractable models which are capable of predicting the behaviour of these flows well. This thesis pre

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47

Aguirre-Puente, Jaime. "Problemes de changement de phase dans les milieux disperses contenant de l'eau." Paris 6, 1988. http://www.theses.fr/1988PA066623.

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48

Atay, N. Z. "Transport and interfacial exchange kinetics in one- and two-phase disperse systems." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374831.

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49

Mfegue, Nkili Augustin. "Contribution a l'etude des ecoulements diphasiques a phase dispersee avec apport de chaleur." Paris 6, 1996. http://www.theses.fr/1996PA066290.

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Ce travail de these est consacre a l'etude d'ecoulements en conduite avec transfert de masse et de chaleur. On construit d'abord un modele monophasique qui tient compte de la geometrie de l'installation industrielle (tubes verticaux descendants et ascendants). L'apport de chaleur est une donnee experimentale. Les variables physiques sont calculees numeriquement le long de l'ecoulement, et representees graphiquement. Ainsi a partir des conditions a l'entree, nous pouvons connaitre l'evolution des variables physiques le long du tube. Dans un second temps, apres avoir donne quelques definitions c

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50

Voronetska, Kateryna. "Simulation numérique directe des écoulements à phases dispersées." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14507/document.

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Dans l'industrie du pétrole et des moteurs, les écoulements de fluides non-miscibles sont fréquemment rencontrés : écoulements d'hydrocarbures dans les conduites, séparation en production, injection de carburant dans les moteurs, procédés de raffinage, etc.Pour modéliser ce type d'écoulement, deux approches sont possibles. Soit l'écoulement est décrit de façon macroscopique et les phénomènes locaux (rupture et coalescence des gouttes, glissement des phases, compaction locale, etc.) sont modélisés à l'aide de lois de fermeture analytiques ou empiriques. Soit l'écoulement est modélisé de manière

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