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Tesi sul tema "Multiphase flow"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Ibrahim, Abba A. "Intelligent Multiphase Flow Measurement." Thesis, Cranfield University, 2009. http://hdl.handle.net/1826/4082.

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The oil and gas industry’s goal of developing high performing multiphase flow metering systems capable of reducing costs in the exploitation of marginal oil and gas reserves, especially in remote environments, cannot be over emphasised. Development of a cost-effective multiphase flow meter to determine the individual phase flow rates of oil, water and gas was experimentally investigated by means of low cost, simple and non-intrusive commercially available sensors. Features from absolute pressure, differential pressure (axial), gamma densitometer, conductivity and capacitance meters, in combina

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2

Nikhar, Hemant G. "Flow assurance and multiphase pumping." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1180.

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3

Carlson, Johan. "Multiphase flow measurements using ultrasound." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17175.

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In process industries such as for example the oil and gas industry, the paper pulp industry, and the mining industry, multiphase flows are common. It is often of interest to measure the mass fractions of the different phases. In for example the mining industry, iron ore powder is transported using water, and there is a need of measurement techniques to monitor the particle mass fraction. Most existing techniques are either invasive, inaccurate, or too slow to be used in an on-line manner. The long-term goal of this research project is to develop a method for measuring mass fractions and mass f

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4

Little, Sylvia Bandy. "Multiphase flow through porous media." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/11779.

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5

Ogazi, Anayo Isaac. "Multiphase severe slug flow control." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/8345.

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Severe slug flow is one of the most undesired multiphase flow regimes, due to the associated instability, which imposes major challenges to flow assurance in the oil and gas industry. This thesis presents a comprehensive analysis of the systematic approach to achieving stability and maximum production from an unstable riser-pipeline system. The development of a plant-wide model which comprises an improved simplified riser model (ISRM) required for severe slug controller design and control performance analysis is achieved. The ability of the ISRM to predict nonlinear stability of the unstable r

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6

Woods, George Stephen. "Studies in vertical multiphase flow." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247344.

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7

Ben, Mahmud Hisham. "Multiphase Transient Flow in Pipes." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1669.

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The development of oil and gas fields in offshore deep waters (more than 1000 m) will become more common in the future. Inevitably, production systems will operate under multiphase flow conditions. The two–phase flow of gas–liquid in pipes with different inclinations has been studied intensively for many years. The reliable prediction of flow pattern, pressure drop, and liquid holdup in a two–phase flow is thereby important.With the increase of computer power and development of modelling software, the investigation of two–phase flows of gas–liquid problems using computational fluid dynamics

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8

Zhao, Yujie. "Wave behaviour in vertical multiphase flow." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/26588.

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The work described in this thesis was aimed at developing the understanding of two regimes in vertical gas-liquid flow in tubes, namely annular flow and churn flow. In annular flow, there is a continuous gas passage at the centre of the pipe with a film of liquid travelling upwards at the wall. Part of the liquid phase in annular flow may be entrained as droplets in the core gas flow. In churn flow there is also a gas core (which the present work has shown to be continuous) and a liquid film; however, the flow direction of the liquid in this film varies with time. Thus, the liquid flows upward

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9

Sheng, Jopan. "Multiphase immiscible flow through porous media." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/53630.

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A finite element model is developed for multiphase flow through soil involving three immiscible fluids: namely air, water, and an organic fluid. A variational method is employed for the finite element formulation corresponding to the coupled differential equations governing the flow of the three fluid phase porous medium system with constant air phase pressure. Constitutive relationships for fluid conductivities and saturations as functions of fluid pressures which may be calibrated from two-phase laboratory measurements, are employed in the finite element program. The solution procedure uses

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10

Kanshio, Sunday. "Multiphase flow in pipe cyclonic separator." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9847.

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Abstract (sommario):

In the petroleum industry, cyclonic separators are acceptable as hydrocyclone, mist eliminators, separator internal device and compact metering package. Weight and small footprint requirements for applications such as subsea separation, downhole separation, and compact gas monetization systems is driving interest in using cyclonic separator for bulk gas-liquid separation. Unfortunately, the challenge of coping with the effect of unsteady inlet flow behaviour on the separator performance limit it acceptance for bulk gas-liquid separation. Fundamental understanding of the flow behaviour inside t

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11

Gorasia, A. K. "Multiphase flow and mixing in microreactors." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2009. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2795.

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12

Dhanabalan, Dinesh. "Multiphase corrosion in wet gas pipelines." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1173812563.

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13

Xu, Wenyuan. "A multiphase harmonic load flow solution technique." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/31035.

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This thesis presents a comprehensive solution technique for power system harmonic analysis with unbalanced load flow conditions. It is based on multiphase modelling of the system in phase quantities. Two of the most important features of this technique are the multiphase approach to the harmonic load flow problem, and the capability to add component nonlinearities easily. The first feature allows the technique to be used for either single-phase or three-phase, and for either balanced or unbalanced harmonic analysis. The second feature allows the later addition of power electronic device mode

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14

Duque, Carlos A. "Critical evaluation of multiphase flow in pipes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0010/MQ35013.pdf.

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15

Olsen, Robert. "Time-dependent boundary conditions for multiphase flow." Doctoral thesis, [Trondheim : Norges teknisk-naturvitenskapelige universitet, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-237.

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16

Valvatne, Per Henrik. "Predictive pore-scale modelling of multiphase flow." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405885.

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17

Arubi, Isaac Marcus Tesi. "Multiphase flow measurement using gamma-based techniques." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/8347.

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Abstract (sommario):

The oil and gas industry need for high performing and low cost multiphase meters is ever more justified given the rapid depletion of conventional oil reserves. This has led oil companies to develop smaller/marginal fields and reservoirs in remote locations and deep offshore, thereby placing great demands for compact and more cost effective soluti8ons of on-line continuous multiphase flow measurement. The pattern recognition approach for clamp-on multiphase measurement employed in this research study provides one means for meeting this need. Cont/d.

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18

Donnelly, G. F. "An analytical evaluation of horizontal multiphase flow." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361244.

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19

Albusaidi, Khamis H. "An investigation of multiphase flow metering techniques." Thesis, University of Huddersfield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338602.

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20

GOMES, DALILA DE SOUSA. "MULTIPHASE FLOW SIMULATOR FOR OIL PRODUCTION WELLS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26315@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Sistemas de escoamento multifásico se formam ao longo de um poço de produção de petróleo. A análise do comportamento do escoamento através da coluna de produção é realizada com o apoio de ferramentas computacionais e é essencial para o projeto e operação de um sistema de produção de petróleo. Os simuladores comerciais disponíveis para esse tipo de análise exigem aquisição de licença, cujo custo é elevado, restringindo seu uso às grandes companhias petrolíferas e aos renomados

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21

Suo, Si. "Modelling Multiphase Flow in Heterogeneous Porous Media." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/27362.

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Multiphase flows in porous media, featured by distributed fluid-fluid interfaces, are commonly seen in nature and daily life. In this dissertation, we focus on effects of the heterogeneity in porous media on multiphase flow processes with the purpose of obtaining further knowledge regarding flow patterns to benefit a range of engineering applications, such as enhanced oil recovery, CO2 sequestration, and transfer printing. Followed by the background introduction and related literature review in Chapters 1 and 2, the main body of this dissertation is composed of three parallel parts investigati

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22

Butler, Jason Edward. "Tomographic imaging for the visualization of multiphase flows /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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23

Mandolesi, Pierpaolo. "Analysis of subcritical multiphase flow through wellhead chokes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Abstract (sommario):

This work presents the evaluation of the theoretical models and empirical correlations for the prediction of multiphase flow rate through wellhead chokes in subcritical conditions. First, literature review was conducted to have a comprehensive understanding of problem and areas that needed to be improved. Then selected existing models, correlations and slip correlations are studied to determine which of them gives the best prediction relative stability and accuracy, evaluating and comparing the flow data tests with three different errors parameters: absolute errors, relative errors and standa

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24

Gustafsson, Gabriella. "Multiphase Motion Estimation in a Two Phase Flow." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5424.

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<p>To improve the control of a steel casting process ABB has developed an Electro Magnetic Brake (EMBR). This product is designed to improve steel quality, i.e. reduce non-metallic inclusions and blisters as well as risk of surface cracks. There is a demand of increasing the steel quality and in order to optimize the steel casting, simulations and experiments play an important role in achieving this. An advanced CFD simulation model has been created to carry out this task.</p><p>The validation of the simulation model is performed on a water model that has been built for this purpose. This wate

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25

Reynolds, David A. "Multiphase flow and transport in fractured geologic environments." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ63448.pdf.

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26

Stevens, Nia Eleri. "Multiphase modelling methods for dry powder inhaler flow." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429946.

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27

McBride, William James. "Division of multiphase flow at a horizontal bifurcation." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324829.

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28

CRUZ, SAMUEL RODRIGUES. "WAX DEPOSITION STUDY IN A MULTIPHASE PIPE FLOW." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=18475@1.

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Abstract (sommario):

O Petróleo é formado por um conjunto de hidrocarbonetos. No reservatório, devido à altas pressões e temperaturas, encontra-se na forma de líquido. Conforme o petróleo escoa, a pressão cai assim como a temperatura, devido a perda de calor para o ambiente marinho, causando a liberação do gás dissolvido no petróleo tornando o escoamento bifásico. Adicionalmente, caso a temperatura caia abaixo da temperatura inicial de cristalização (TIAC), ocorre precipitação dos cristais, formando uma fase sólida que se deposita na parede interna das tubulações. Deposição de parafinas é um dos mais críticos prob

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29

Snyder, Kevin P. "Multiphase flow and mass transport through porous media." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/40658.

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30

Lebon, Gerard Serge Bruno. "Unstructured finite volume algorithms for compressible multiphase flow." Thesis, University of Greenwich, 2011. http://gala.gre.ac.uk/8077/.

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This research presents novel algorithms for computing flow within an unstructured, collocated, finite volume solver in the presence of non-orthogonality and compressibility in order to extend the range of problems which can be modelled with the University's in-house CFD code: PHYSICA. A new non-orthogonality diffusion correction relaxation parameter has been successfully introduced and tested with benchmarks from the literature. Cases involving geometries meshed with commercial packages have been successfully run with the diffusion correction methods, variable bounding and proper under-relaxat

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31

Goater, Aaron Lewis. "Multiphase flow simulation with applications for CO₂ storage." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9538.

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Abstract (sommario):

Geological storage of carbon dioxide (CO2) has potential to significantly reduce atmospheric emissions of greenhouse gases. However, challenges exist to the successful establishment of this process. These include estimating and understanding storage capacity as well as its economic viability. A large proportion of Europe’s potential storage capacity is to be found in large open aquifers. However, in times when the European carbon price is low, storage in depleted oil reservoirs may be required to make early commercial projects economically viable. Regulation will require that storage in these

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32

Blaney, S. "Gamma radiation methods for clamp-on multiphase flow metering." Thesis, Cranfield University, 2008. http://dspace.lib.cranfield.ac.uk/handle/1826/5655.

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The development of a cost-effective multiphase flow meter to determine the individual phase flow rates of oil, water and gas was investigated through the exploitation of a single clamp-on gamma densitometer and signal processing techniques. A fast-sampling (250 Hz) gamma densitometer was installed at the top of the 10.5 m high, 108.2 mm internal diameter, stainless steel catenary riser in the Cranfield University multiphase flow test facility. Gamma radiation attenuation data was collected for two photon energy ranges of the caesium-137 radioisotope based densitometer for a range of air, water

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33

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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34

Soundararajan, Krishna Kumar. "Multi-scale multiphase modelling of granular flows." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/252953.

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Geophysical hazards usually involve multiphase flow of dense granular solids and water. Understanding the mechanics of granular flow is of particular importance in predicting the run-out behaviour of debris flows. The dynamics of a homogeneous granular flow involve three distinct scales: the microscopic scale, the meso-scale, and the macroscopic scale. Conventionally, granular flows are modelled as a continuum because they exhibit many collective phenomena. Recent studies, however, suggest that a continuum law may be unable to capture the effect of inhomogeneities at the grain scale level, suc

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35

Al-Awadi, Hameed. "Multiphase characteristics of high viscosity oil." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/13902.

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Heavy oil production has drawn more and more attention in petroleum industry. The amount of heavy oil in the world is twice more than the conventional oil (low viscosity), which has been consumed rapidly from the past. The understanding of flow patterns and pressure losses in multiphase flow with high viscosity oil are vital to assist the design of transportation pipeline. This thesis involves experimental investigation of two phase and three phase flows under high oil viscosity conditions (up to 17000cP) in horizontal pipelines. The multiphase (oil/water/solid/gas) facility was designed and c

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36

Jofre, Cruanyes Lluís. "Numerical simulation of multiphase immiscible flow on unstructured meshes." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/277545.

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The present thesis aims at developing a basis for the numerical simulation of multiphase flows of immiscible fluids. This approach, although limited by the computational power of the present computers, is potentially very important, since most of the physical phenomena of these flows often happen on space and time scales where experimental techniques are impossible to be utilized in practice. In particular, this research is focused on developing numerical discretizations suitable for three-dimensional (3-D) unstructured meshes. In detail, the first chapter delimits the considered multiphase f

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37

Reichenberger, Volker. "Numerical simulation of multiphase flow in fractured porous media." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970266049.

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38

Da, Silva Marco Jose. "Impedance Sensors for Fast Multiphase Flow Measurement and Imaging." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1228836406821-31677.

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Multiphase flow denotes the simultaneous flow of two or more physically distinct and immiscible substances and it can be widely found in several engineering applications, for instance, power generation, chemical engineering and crude oil extraction and processing. In many of those applications, multiphase flows determine safety and efficiency aspects of processes and plants where they occur. Therefore, the measurement and imaging of multiphase flows has received much attention in recent years, largely driven by a need of many industry branches to accurately quantify, predict and control the fl

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39

Machadao, Ricardo Tavora Heitmann. "Multiphase flow in Venturi : an experimental and theoretical study." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8069.

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40

Kéchavarzi, Cédric. "Physical modelling of immiscible multiphase flow in porous media." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/251766.

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41

Gopal, Madan. "Visualization and mathematical modelling of horizontal multiphase slug flow." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1173979842.

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42

Malcolm, Lorna Taryn. "Multiphase flow in porous media at low interfacial tension." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362036.

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43

Nieves, Remacha María José. "Microreactor technology : scale-up of multiphase continuous flow chemistries." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91068.

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Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Microreactors have been demonstrated to provide many advantages over conventional process technologies for the synthesis of chemical compounds and kinetic studies at the laboratory scale. High heat and mass transfer rates, rapid mixing, and higher selectivities and conversions can be achieved in these microdevices thanks to the small characteristic dimensions, enabling the synthesis of compounds that cannot be synth

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44

Jacobs, Bruce Lee. "Effective properties of multiphase flow in heterogeneous porous media." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9697.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 1999.<br>Includes bibliographical references (leaves 218-224).<br>The impact of heterogeneity on multiphase fl.ow is explored using a spectral perturbation technique employing a stationary, stochastic representation of the spatial variability of soil properties. A derivation of the system's effective properties - nonwetting phase moisture content, capillary pressure, normalized saturation and permeability - was developed which is not specific as to the form of the permeability depende

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45

Nitsche, Ludwig C. (Ludwig Carlos). "Multiphase flow through spatially periodic models of porous media." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/111043.

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46

Jhunjhunwala, Manish. "Multiphase flow and control of fluid path in microsystems." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/37456.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, February 2005.<br>Includes bibliographical references.<br>Miniaturized chemical-systems are expected to have advantages of handling, portability, cost, speed, reproducibility and safety. Control of fluid path in small channels between processes in a chemical/biological network is crucial for connecting process elements. We show complete separation of individual phases (phase routing) from two-phase gas-liquid and liquid-liquid (aqueous-organic) mixtures on microscale. To provide for robust interfacing of ope

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47

Gunstensen, Andrew K. (Andrew Knut). "Lattice-Boltzmann studies of multiphase flow through porous media." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13168.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.<br>Includes bibliographical references (p. 115-122).<br>by Andrew K. Gunstensen.<br>Ph.D.

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48

Silva, Marco Jose da. "Impedance Sensors for Fast Multiphase Flow Measurement and Imaging." Dresden : TUDpress, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3200883&prov=M&dok_var=1&dok_ext=htm.

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49

Zhang, Jiazuo. "Self-potential during multiphase flow in complex porous media." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/48479.

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The rock pore space in many subsurface settings is saturated with water and one or more immiscible fluid phases; examples include non-aqueous-phase liquids (NAPLs) in contaminated aquifers, supercritical CO2 during sequestration in deep saline aquifers, the vadose zone, and hydrocarbon reservoirs. Self-potential (SP) methods have been proposed to monitor multiphase flow in such settings. However, to properly interpret and model these data requires an understanding of the saturation dependence of the streaming potential. This study presents a methodology to determine the saturation dependence o

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50

Grieb, Neal Phillip. "Multiresolution analysis for adaptive refinement of multiphase flow computations." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/677.

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Flows around immersed boundaries exhibit many complex, well defined and active dynamical structures. In fact, features such as shock waves, strong vorticity concentrations in shear layers, wakes, or boundary layer regions are critical elements in representing the dynamics of a flow field. In order to capture the correct kinematic and dynamic quantities associated with the fluid flows, one must be able to efficiently refine the computational mesh around areas containing high gradients of pressure, density, velocity, or other suitable flowfield variables that characterize distinct structures. Al

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