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Dissertations / Theses on the topic 'Multiphase interactions'

Author: Grafiati

Published: 20 February 2023

Last updated: 31 July 2025

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1

Farhan, Noor M. "Multiphase Droplet Interactions with a Single Fiber." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5937.

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Abstract Multiphase Droplet Interactions with a Single Fiber By: Noor M. Farhan A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University. Virginia Commonwealth University, 2019 Director: Hooman V. Tafreshi, Professor, Department of Mechanical and Nuclear Engineering Formulating the physics of droplet adhesion to a fiber is interesting intellectually and important industrially. A typical example of a droplet–fiber system in nature is the dew droplets on spider webs, where droplets first precipitate and grow on

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2

Koutsakis, Konstantinos. "Multiphase numerical modelling of particle-flow interactions in plasma spraying processes." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/412642/.

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The current work looks at the challenges of developing a computational solution for the modelling of the plasma spraying industrial process. A set of three 3D Computational Fluid Dynamics (CFD) models were developed and studied for this purpose. The first model that was implemented looks at the effects the electromagnetic properties have in the properties of the plasma flow in the nozzle of the spraying device. The second model studies the particle in flight atomisation after coding the thermal exchanges in the C++ framework and compares the results with experimental data. The third model stud

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3

Bonuccelli, Courtney Leigh Herring. "A theoretical and experimental investigation of multi-phase interactions in pure and multicomponent droplet evaporation." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Fall2006/C_Bonuccelli_012907.pdf.

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4

Ukai, Satoshi. "Richtmyer-Meshkov instability with reshock and particle interactions." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34724.

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Richtmyer-Meshkov instability (RMI) occurs when an interface of two fluids with different densities is impulsively accelerated. The main interest in RMI is to understand the growth of perturbations, and numerous theoretical models have been developed and validated against experimental/numerical studies. However, most of the studies assume very simple initial conditions. Recently, more complex RMI has been studied, and this study focuses on two cases: reshocked RMI and multiphase RMI. It is well known that reshock to the species interface causes rapid growth of interface perturbation amplitud

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5

Greco, Edwin F. "Thermal and hydrodynamic interactions between a liquid droplet and a fluid interface." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22548.

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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2008.<br>Committee Chair: Roman O. Grigoriev; Committee Member: Daniel Goldman; Committee Member: Michael Schatz; Committee Member: Minami Yoda; Committee Member: Predrag Cvitanovic.

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6

Qin, Tong. "Numerical Simulations of Interactions of Solid Particles and Deformable Gas Bubbles in Viscous Liquids." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19225.

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Studying the interactions of solid particles and deformable gas<br />bubbles in viscous liquids is very important in many applications,<br />especially in mining and chemical industries. These interactions<br />involve liquid-solid-air multiphase flows and an<br />arbitrary-Lagrangian-Eulerican (ALE) approach is used for the direct<br />numerical simulations. In the system of rigid particles and<br />deformable gas bubbles suspended in viscous liquids, the<br />Navier-Stokes equations coupled with the equations of motion of the<br />particles and deformable bubbles are solved in a finite-eleme

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7

Grosche, Lucas Caetano. "Study of the interactions between emulsion flow and a spectrometer probe based on numerical simulations." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-17102014-114519/.

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In the present work, the flow behavior of an oil-in-water emulsion around and inside the measurement chamber of an in-line optical sensor probe is studied. The emulsion consists of a metalworking fluid, with oil droplets diameter ranging from 100 nanometers to 100 micrometers. The design of the UV-Vis light spectrometer probe is in accordance with the concept proposed in the research project named EPM (Emulsion Process Monitor in Metalworking Processes), carried out within the scope of the BRAGECRIM program between the University of São Paulo and the University of Bremen. This study is based o

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8

Huang, Pengyu. "Multiscale Modelling of Dynamic Contact Angles for CO2-Water-Silica Systems." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20937.

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The capillary and dynamic wetting behaviour in porous media is crucial in many engineering problems which are highly related to the multiphase interactions between fluids and solids. This thesis will focus on the behaviour of dynamic contact angle of the supercritical CO2/water flow in the silica slit as a function of the contact line velocity at both the nanoscale and microscale, which can help us gain an in-depth understanding of the dynamic processes in CO2 geosequestration in saline aquifers. Our molecular dynamics (MD) simulations calculate the contact angle quantitatively at different ve

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9

Chadil, Mohamed-Amine. "Penalty methods for the simulation of fluid-solid interactions with various assemblies of resolved scale particles." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0205/document.

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Les simulations des écoulements diphasiques à l’échelle réelle de l’application nécessitent des modèles pour les termes non fermés des équations macroscopiques. Des simulations numériques directes à particule résolue utilisant la méthode de pénalisation visqueuse ont été réalisées afin de mesurer les interactions entre des particules de différentes formes (sphérique et ellipsoïdale) et le fluide porteur à différents régimes d'écoulement (de stokes à l'inertiel). Deux méthodes ont été développées durant cette thèse afin d'extraire les forces hydrodynamiques ainsi que le transfert de chaleur sur

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10

Damiani, Leonardo Hax. "SHPECK : um software de modelagem de especiação geoquímica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/131869.

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Um software de modelagem de especiação geoquímica é responsável pelo cálculo da distribuição das espécies dissolvidas entre solutos e complexos aquosos, e também computar os índices de saturação para diferentes minerais. Neste trabalho nós apresentamos SHPECK, um software desenvolvido para modelar sistemas de equilíbrio geoquímico usando condições de balanço de massa baseadas no conceito da lei de fases (GARRELS; CHRIST, 1965). SHPECK gera um sistema de equações de ação de massa acopladas com restrições de equilíbrio e resolve com a utilização do método se Newton-Raphson. Nosso software aceita

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11

From, Christopher. "High-order lattice Boltzmann for nonideal fluid mixtures." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/200190/1/Christopher_From_Thesis.pdf.

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Nonideal fluid mixtures are ubiquitous in nature and the study of their fundamental dynamics is important in many areas of modern science, such as miniaturized flow processes for portable small-scale medical diagnostic tools. However, numerical simulations of such flows face a formidable multi-scale challenge due to the competing nonideal interactions. This thesis presents a novel numerical model for simulating nonideal fluid mixtures based on high-order lattice Boltzmann methods. A solution to gauge the physical interpretations of nonideal interactions is proposed and with this, previously un

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12

Omidy, Ali D. "Multiphase Interaction in Low Density Volumetric Charring Ablators." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/128.

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The present thesis provides a description of historical and current modeling methods with recent discoveries within the ablation community. Several historical assumptions are challenged, namely the presence of water in Thermal Protection System (TPS) materials, presence of coking in TPS materials, non-uniform elemental production during pyrolysis reactions, and boundary layer gases, more specifically oxygen, interactions with the charred carbon interface. The first topic assess the potential effect that water has when present within the ablator by examining the temperature prole histories of t

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13

Yang, Liang. "An immersed computational framework for multiphase fluid-structure interaction." Thesis, Swansea University, 2015. https://cronfa.swan.ac.uk/Record/cronfa42413.

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The objective of this thesis is to further extend the application range of immersed computational approaches in the context of hydrodynamics and present a novel general framework for the simulation of fluid-structure interaction problems involving rigid bodies, flexible solids and multiphase flows. The proposed method aims to overcome shortcomings such as the restriction of having to deal with similar density ratios among different phases or the restriction to solve single-phase flows. The new framework will be capable of coping with large density ratios, multiphase flows and will be focussed

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14

Sanna, Francesco. "Interaction between Flow Induced Pulsations and Multiphase Flows in Gas Liquid Systems." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1008/document.

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Le couplage entre un écoulement instable et des résonances acoustiques dans des systèmes de conduites peut conduire à des phénomènes d’oscillations auto-induites. Ce type de phénomènes trouve principalement place dans des conduites latérales fermées, par exemple dans des systèmes de transport ou de compression de gaz. L’objectif de ce travail est d’étudier les oscillations auto-induites dans le cas où le fluide transporté ne se limite pas à un gaz, mais est un mélange de gaz et de liquide. Les pulsations sont mesurées dans des conduites latérales fermées, pour deux types de configurations (en

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15

Douglas, Steven. "Numerical Modeling of Extreme Hydrodynamic Loading and Pneumatic Long Wave Generation: Application of a Multiphase Fluid Model." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/34076.

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In this study, a three-dimensional two-phase (air and water) numerical solver is applied to investigate free surface flows. The first component aims to improve the overall understanding of the underlying physical mechanisms that occur during the interaction between turbulent hydraulic bores and simple structures. Data collected during large-scale physical experiments based on generating dam-break waves in a horizontal rectangular channel is used for comparing to the numerical results. An extensive sensitivity analysis on numerical parameters including spatial discretization and turbulence mode

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16

Krimi, Abdelkader. "Modélisation des écoulements fluide multiphasiques avec une approche SPH." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0004/document.

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La méthode Smoothed Particle Hydrodynamics (SPH) est une méthode lagrangienne, sans maillage développée initialement pour des simulations de phénomènes astrophysiques. Depuis, elle a connu de nombreuses applications, notamment pour la simulation des écoulements des fluides. Contrairement aux méthodes utilisant un maillage, la méthode SPH peut gérer de manière naturelle et sans traitement spécifique les simulations des écoulements à sur- face libre et multiphasiques avec interface subissant de grandes déformations. Dans cette thèse, une modélisation SPH des écoulements des fluides multiphasique

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17

Baujard, Clément. "Modélisation de l'écoulement de deux fluides non miscibles dans des milieux fractures ; application à l'injection d'eau à grande profondeur et à la recherche d'eau douce en milieu côtier." Paris, ENMP, 2005. http://www.theses.fr/2005ENMP1324.

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Ces travaux ont pour but l’interprétation des mesures obtenues sur le site de recherche pour la production d'éléctricité à grande eéhelle grace à la géothermie (soultz-sous-forêts) lors du developpement du réservoir géothermique et des essais de ciruculation. Le contraste de densité entre l'eau douce et froide injectée et les saumures chaudes presentes a 5 km se traduit par des observations de terrain très complexes qui sont ici abordées en considérant ces deux fluides comme deux phases non miscibles. Le code de simulation d'écoulement en milieu fracture fracas, basé sur une approche réseau di

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18

Balakrishnan, Kaushik. "On the high fidelity simulation of chemical explosions and their interaction with solid particle clouds." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34672.

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High explosive charges when detonated ensue in a flow field characterized by several physical phenomena that include blast wave propagation, hydrodynamic instabilities, real gas effects, fluid mixing and afterburn effects. Solid metal particles are often added to explosives to augment the total impulsive loading, either through direct bombardment if inert, or through afterburn energy release if reactive. These multiphase explosive charges, termed as heterogeneous explosives, are of interest from a scientific perspective as they involve the confluence and interplay of various additional physica

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19

Berti, Rafael da Cruz Ribeiro. "Interaction of turbulent structures with ethanol sprays in mixture formation processes in a constant-flow chamber." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-19092018-082453/.

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The study in formation and evolution of sprays is essential for developing more detailed physical models and new injection strategies for direct injection internal combustion engines. In the present work, the sprays from a multi-hole injector are evaluated in an effort to characterize the effects of the spray development in a constant surrounding air flow. These interactions are studied in terms of the air turbulence characteristics, the inlet air mass flow and the fuel injection pressure. Ethanol sprays are injected in a constant-flow chamber. The apparatus purpose is to isolate the experimen

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20

Bräuer, Peter. "Extension and application of a tropospheric aqueous phase chemical mechanism (CAPRAM) for aerosol and cloud models." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183743.

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The ubiquitous abundance of organic compounds in natural and anthorpogenically influenced eco-systems has put these compounds into the focus of atmospheric research. Organic compounds have an impact on air quality, climate, and human health. Moreover, they affect particle growth, secondary organic aerosol (SOA) formation, and the global radiation budget by altering particle properties. To investigate the multiphase chemistry of organic compounds and interactions with the aqueous phase in the troposphere, modelling can provide a useful tool. The oxidation of larger organic molecules to the fina

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21

Pomarède, Marie. "Investigation et application des méthodes d'ordre réduit pour les calculs d'écoulements dans les faisceaux tubulaires d'échangeurs de chaleur." Thesis, La Rochelle, 2012. http://www.theses.fr/2012LAROS355/document.

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Cette thèse s’intéresse à la faisabilité de la mise en place de modèles d’ordre réduit pour l’étude des vibrations sous écoulement au sein de faisceaux tubulaires d’échangeurs de chaleur. Ces problématiques sont cruciales car les systèmes étudiés sont des éléments majeurs des centrales nucléaires civiles et des chaufferies embarquées dans les sous-marins.Après avoir rappelé le fonctionnement et les risques vibratoires existants au sein des échangeurs de chaleur, des calculs complets d’écoulement et de vibrations sous écoulement ont été effectués, d’abord pour un tube seul en milieu infini, pui

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22

Douillet-Grellier, Thomas. "Etude comparative des méthodes d'origine particulaire SPH et LBM pour la simulation d'écoulements polyphasiques intermittents dans des conduites." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN030/document.

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L’objectif de cette thèse est d’étudier les apports et les limitations de deux méthodes d’origine particulaire, SPH et LBM, dans le cadre de la simulation des écoulements à bouchons dans des conduites. Dans l’industrie pétrolière, ce type d’écoulement, que l’on retrouve par exemple dans les pipelines qui acheminent le pétrole et le gaz jusqu’aux raffineries, est connu pour endommager les installations et pour réduire l’efficacité du transport des fluides. Il est donc important de bien comprendre leur formation. Nous avons donc implémenté ces deux méthodes, ainsi que leurs variantes polyphasiqu

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23

Patel, Nayan V. "Simulation of Hydrodynamic Fragmentation from a Fundamental and an Engineering Perspective." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16225.

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Liquid fragmentation phenomenon is explored from both a fundamental (fully resolved) and an engineering (modeled) perspective. The dual objectives compliment each other by providing an avenue to gain further understanding into fundamental processes of atomization as well as to use the newly acquired knowledge to address practical concerns. A compressible five-equation interface model based on a Roe-type scheme for the simulation of material boundaries between immiscible fluids with arbitrary equation of state is developed and validated. The detailed simulation model accounts for surface-tensio

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24

Cantarero, Abad Irene. "Deformation-fluid multiphase interaction within the fractures of the Barcelona Plain and the Vallès Basin: influence on fault rocks and diagenesis / Interacció multifàsica entre deformació i fluids a les fractures del Pla de Barcelona i de la Conca del Vallès: influència en les roques de falla i en la diagènesi." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/110412.

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The faults limiting the Barcelona Plain and the Vallès Half-graben (Catalan Coastal Ranges, NE Spain) have allowed the study of a complex and multiphase tectonic/fluid history from the Hercynian to recent times. Furthermore, this study has allowed to define the factors that control the fluid regime and the fluid flow pathways through faults. A multidisciplinary methodology involving field and petrological observations and microstructural analyses combined with geochemical data has been used to characterize host rocks, fault rocks and fracture-related cements. Four tectonic events that e

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25

Perrier, Vincent. "Modélisation et simulation d'écoulements multiphasiques compressibles avec ou sans changement de phase : application à l'interaction laser-plasma." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13560.

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Ce travail porte sur la modélisation et la simulation d’écoulements compressibles. Par une démarche d’homogénéisation, on commence par dériver un modèle d’écoulements diphasiques à sept équations. Les termes de fluctuation restants sont modélisés par des termes de relaxation. Dans le cas où ces coefficients de relaxation tendent vers l’infini, ce qui correspond à des écoulements très bien mélangés, on obtient par un développement asymptotique un modèle à cinq équations qui est strictement hyperbolique, mais non-conservatif. La discrétisation de ce modèle est obtenue par un développement asympt

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26

Siddappa, Chethan. "Numerical simulation of the attenuation of hydrogen explosion by spraying water." Electronic Thesis or Diss., Normandie, 2025. http://www.theses.fr/2025NORMIR03.

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Les ondes de choc à haute pression sont cruciales dans de nombreux processus industriels et environnementaux impliquant l'énergie hydrogène. Les explosions d'hydrogène posent des risques importants pour les structures et la sécurité humaine, faisant des systèmes de pulvérisation d'eau une solution essentielle, notamment pour le confinement des réacteurs nucléaires. Ce manuscrit étudie les interactions entre les ondes de choc et les sprays d'eau pour atténuer les explosions d'hydrogène à l'aide de modélisations multiphasiques avancées. Les premières simulations numériques dans des configuration

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27

Pachler, Klaus, Thomas Frank, and Klaus Bernert. "Simulation of Unsteady Gas-Particle Flows including Two-way and Four-way Coupling on a MIMD Computer Architectur." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200352.

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The transport or the separation of solid particles or droplets suspended in a fluid flow is a common task in mechanical and process engineering. To improve machinery and physical processes (e.g. for coal combustion, reduction of NO_x and soot) an optimization of complex phenomena by simulation applying the fundamental conservation equations is required. Fluid-particle flows are characterized by the ratio of density of the two phases gamma=rho_P/rho_F, by the Stokes number St=tau_P/tau_F and by the loading in terms of void and mass fraction. Those numbers (Stokes number, gamma) define the f

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28

Guiza, Ghalia. "Reliable and Adaptive CFD Framework for Airship Design." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM021.

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Cette thèse porte sur la modélisation et la simulation numérique d'écoulements instationnaires et turbulents dans un contexte d'aérodynamique externe. L'étude proposée contribue au développement de méthodes adaptées aux écoulements incompressibles, monophasiques et multiphasiques, autour de divers corps profilés et non-profilés. Celles-ci reposent sur une méthode éléments finis stabilisés innovante de type Variational Multiscale (VMS), dans laquelle la solution est décomposée a priori en une grande échelle résolue et une petite échelle modélisé, dont l’effet sur la grande échelle est pris en c

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29

Mecherbet, Amina. "Modélisation des fluides multiphasiques." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS036.

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Dans cette thèse, nous nous intéressons à la modélisation et l'analyse mathématique de certains problèmes liés aux écoulements en suspension. Le premier chapitre concerne la justification du modèle de type transport-Stokes pour la sédimentation de particules sphériques dans un fluide de Stokes où l'inertie des particules est négligée et leur rotation est prise en compte. Ce travail est une extension des résultats antérieurs pour un ensemble plus général de configurations de particules. Le deuxième chapitre concerne la sédimentation d'une distribution d'amas de paires de particules dans un flui

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Armstrong, Ryan T. "Microbial enhanced oil recovery : a pore-scale investigation of interfacial interactions." Thesis, 2012. http://hdl.handle.net/1957/26899.

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Current oil production technologies recover only about one‐third to one‐half of the oil originally present in an oil reservoir. Given current oil prices, even a modest increase in oil recovery efficiency is fiscally attractive. One novel approach to increase oil recovery efficiency is a process called microbial enhanced oil recovery (MEOR), where microorganisms are either used as a clogging agent to redirect flow or to produce biosurfactant that reduces interfacial tension. This dissertation aims to understand the MEOR pore‐scale mechanisms relevant to oil recovery by taking a two‐fold approac

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31

"On the control of the interactions between phase transformations and mechanical properties in finely-grained multiphase alloys, a way for sustainable development in materials science." Université catholique de Louvain, 2007. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-08302007-154525/.

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Huang, Chih-Jung, and 黃致榮. "Interaction Analyses of Three Dimensional Multiphase Fluids and Flexible Solids." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/66936308122910437258.

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博士<br>國立中央大學<br>土木工程學系<br>101<br>Three dimensional fluid-structure dynamic interaction behaviors contain fruitful and complex physical phenomena and are interested to engineers for their design and analysis works. Computational mechanics is an effective way to assist engineers obtaining more detail information for this type of problem. This dissertation presents a newly developed fluid-solid interaction analysis algorithm. This algorithm can be used to investigate the motions of discrete deformable bodies in multi-phase viscous fluid. The CFD analysis in this computation algorithm uses th

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Yi-ChengChen and 陳翼正. "Development of a Numerical Method for Multiphase Fluid-Particle Interaction Problems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/13609539878470927516.

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博士<br>國立成功大學<br>航空太空工程學系碩博士班<br>101<br>A direct-forcing immersed boundary pressure correction method is developed to simulate the fluid-particle interaction problems. Two particle collision models are applied to compute the force and torque from particle to particle and particle to solid boundary collisions in the fluid. An elastic collision force method is used to calculate the motion of submersed particle for the particle collision in single-fluid flow and a discrete element method (DEM) is applied for the complex motion of particle in two-fluid flow. For the simulation of the fluid-particle

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34

Mecherbet, Amina. "Modeling of multiphase flows." Thesis, 2019. http://www.theses.fr/2019MONTS036/document.

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Dans cette thèse, nous nous intéressons à la modélisation et l'analyse mathématique de certains problèmes liés aux écoulements en suspension.Le premier chapitre concerne la justification du modèle de type transport-Stokes pour la sédimentation de particules sphériques dans un fluide de Stokes où l'inertie des particules est négligée et leur rotation est prise en compte. Ce travail est une extension des résultats antérieurs pour un ensemble plus général de configurations de particules.Le deuxième chapitre concerne la sédimentation d'une distribution d'amas de paires de particules dans un fluide

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35

Ut, Han Dinh. "Development of Numerical Wave Tank Based on Multiphase Flow Model and Its Application to Nonlinear Interaction between Wave and Movable Structure." Thesis, 2011. http://hdl.handle.net/2237/16453.

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Shim, Jay Jayne. "A Multiphasic-Fluid-Structure Interaction Formulation Based on Mixture Theory and Its Finite Element Implementation in FEBio." Thesis, 2021. https://doi.org/10.7916/d8-2ewb-dj32.

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Computational modeling is increasingly necessary to the biomechanics and biophysics communities in order to model the solid, fluid, and solute mechanics of biological systems of interest, spanning across the molecular, cellular, tissue, organ, and whole-body levels. However, most commercial and custom codes are not suitable for biomechanical applications. Many such problems require either the use of specialized boundary conditions and material models or multiphysics simulations to obtain sufficiently accurate results and predictions. Verifying and sharing results from available software can be

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Mitra, Subhasish. "Droplet particle interaction in a flowing gas stream." Thesis, 2016. http://hdl.handle.net/1959.13/1315709.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Droplet-particle collision interaction in a flowing gas stream is one of the major phase interaction phenomena in a wide class of multiphase process applications such as spouted bed coating, fluid catalytic cracking unit, fluid coking process for bitumen upgrade process etc. that govern the process performance to a significant extent. Such interactions are manifestations of complex hydrodynamics involving competing interplay of various forces e.g. viscous, capillary, inertial and gravity coupled with simultaneous heat and mass transport proces

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Grimaldi, Gioacchino. "Prediction models for the dynamical behaviour of multi-phase annular seals." Doctoral thesis, 2018. http://hdl.handle.net/11589/123283.

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Sempre maggior interesse è stato dedicato nelle ultime due decadi nello studio e sviluppo di pompe multifase. Le pompe multifase elaborano miscele di fluidi immiscibili (compressibili e non) ad alte velocità e potenze specifiche per stadio in modo da ridurre dimensioni e costi. Tali peculiarità rendono questo tipo di turbomacchine molto attraenti in settori industriali come l’Oil&Gas, sia per applicazioni sottomarine che in superficie, industria chimica e farmaceutica. Di primaria importanza, in fase di progettazione della macchina, è la valutazione della stabilità rotordinamica della turbomac

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