Dissertations / Theses on the topic 'Multi phase flow measurements'
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Teague, Gavin. "Mass flow measurement of multi-phase mixtures by means of tomographic techniques." Doctoral thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/5097.
Full textThis thesis investigates the use of a dual-plane impedance tomography system to calculate the individual mass flow rates of the components in an air-gravel-seawater mixture. The long-term goal of this research is to develop a multi-phase flowmeter for the on-line monitoring of an airlift used in an offshore mining application. This requires the measurement of both the individual component volume fractions and their velocities. Tomography provides a convenient non-intrusive technique to obtain this information. Capacitance tomography is used to reconstruct the dielectric distribution of the material within a pipeline. It is based on the concept that the capacitance of a pair of electrodes depends on the dielectric distribution of the material between the electrodes. By mounting a number of electrodes around the periphery of the pipeline, and measuring the capacitances of the different electrode combinations, it is possible to reconstruct the distribution of the phases within the pipeline, provided the phases have different dielectric constants. Resistance tomography is used to reconstruct the resistivity distribution within the cross-section of the pipeline and operates in a similar way to capacitance tomography. Impedance tomography can be described as a dual-modal approach since both the capacitance and conductance of the different electrode combinations are measured to reconstruct the omplex impedance of the material distribution. Previous research has shown that impedance tomography can be used to reconstruct a three-phase air-gravelwater mixture [3,4]. In addition, it has been shown that neural networks can be used to perform this reconstruction task [3,4]. In particular, a single-layer feed-forward neural network with a 1-of-C output encoding can be trained to perform a three-phase image reconstruction. Further, a double-layer feed-forward neural network can be trained to predict the volume fractions of the three phases within the flow directly, based on the capacitance and conductance readings obtained from the data acquisition system. However, these tests were only for static configurations. This thesis will readdress this problem from the dynamic viewpoint. In addition, the individual component velocities will be calculated using the cross-correlation of the volume fraction predictions from two impedance tomography systems spaced a certain distance apart.
Hastings, Robert. "Use of multi-scale phase-based methods to determine optical flow in dynamic scene analysis." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2003. https://ro.ecu.edu.au/theses/1487.
Full textAl-Yarubi, Qahtan. "Phase flow rate measurements of annular flows." Thesis, University of Huddersfield, 2010. http://eprints.hud.ac.uk/id/eprint/9104/.
Full textDai, Yunfeng. "Integration of tomographic two-phase flow measurements." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421439.
Full textCarlson, Johan E. "Ultrasound measurements in moving multi-phase supsensions." Thesis, Luleå tekniska universitet, Signaler och system, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-24689.
Full textLakkadi, Navneeth Sagar Reddy. "Flow Measurements in Turbulent Flow Fields with Magnetic Resonance Phase Velovity Mapping." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1251412647.
Full textLakkadi, Navneeth Sagar Reddy. "Flow measurements in turbulent flow fields with magnetic resonance phase velocity mapping." Cleveland, Ohio : Cleveland State University, 2009. http://etd.ohiolink.edu/view.cgi?acc_num=csu1251412647.
Full textAbstract. Title from PDF t.p. (viewed on Sept. 8, 2009). Includes bibliographical references (p. 129-135). Available online via the OhioLINK ETD Center and also available in print.
Djatmiko, Wahju. "Well testing in multi-phase flow reservoirs." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/8128.
Full textBunch, Thomas K. "Performance measurements of a flashing flow nozzle." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-03042009-041255/.
Full textPetersson, Sven. "Simulation of Phase Contrast MRI Measurements from Numerical Flow Data." Thesis, Linköping University, Department of Biomedical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-14871.
Full textPhase-contrast magnetic resonance imaging (PC-MRI) is a powerful tool for measuring blood flow and has a wide range of cardiovascular applications. Simulation of PC-MRI from numerical flow data would be useful for addressing the data quality of PC-MRI measurements and to study and understand different artifacts. It would also make it possible to optimize imaging parameters prior to the PC-MRI measurements and to evaluate different methods for measuring wall shear stress.
Based on previous studies a PC-MRI simulation tool was developed. An Eulerian-Lagrangian approach was used to solve the problem. Computational fluid dynamics (CFD) data calculated on a fix structured mesh (Eulerian point of view) were used as input. From the CFD data spin particle trajectories were computed. The magnetization of the spin particle is then evaluated as the particle travels along its trajectory (Lagrangian point of view).
The simulated PC-MRI data were evaluated by comparison with PC-MRI measurements on an in vitro phantom. Results indicate that the PC-MRI simulation tool functions well. However, further development is required to include some of the artifacts. Decreasing the computation time will make more accurate and powerful simulations possible. Several suggestions for improvements are presented in this report.
Czarske, J. W., N. Koukourakis, J. Koenig, B. Fregin, and L. Büttner. "Wavefront shaping for flow-field measurements through varying phase boundaries." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35104.
Full textPerret, Matias Nicholas. "Experimental measurements of a two phase surface jet." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/5041.
Full textLu, Qin. "A parallel multi-block/multi-physics approach for multi-phase flow in porous media /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Full textCunningham, Michael (Michael Ian) Carleton University Dissertation Engineering Civil and Environmental. "Relative permeability measurements for two phase flow through low permeability soils." Ottawa, 1994.
Find full textKraczek, Jeffrey Read. "Piston Phase Measurements to Accelerate Image Reconstruction in Multi-Aperture Systems." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1323284036.
Full textTahmasbi, Nowtarki Koroush. "Two phase hydrodynamics in cross-flow distillation." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8424.
Full textSvanholm, Ulrika. "Evaluation of measurements of pulsating flow under controlled conditions using phase contrast MRI." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7222.
Full textThe accuracy and precision of measurements of pulsating flow obtained with phase contrast magnetic resonance imaging (PC MRI) was studied. Measurements were carried out using known flow rates through a phantom connected to a pump that created pulsation in the flow. Repeated measurements were made in both the negative and positive encoding direction, using both breath-hold and non breath hold sequences. The obtained data was analyzed using code written in MATLAB and also using the FLOW software that is offered by the manufacturer of the MRI system.
A range of different flow velocities was scanned, and results show that the overall accuracy of the measurements is relatively good, with an average error of between 1.2% to 5.7% using the clinically employed flow calculation software. There is however indication of a systematic phase offset in the data that influences the measurements. The effect of the offset on the results depends on the direction of flow and the sequence used. The results also show the importance of properly selecting the area over which the flow rate is calculated.
SHI, WENJIANG. "Surface mapping by polarization and Multi-Wavelength synthesis measurements." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-20053.
Full textDunbar, Oliver. "A diffuse interface model of surfactants in multi-phase flow." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/99133/.
Full textHashemi, Mohammad Reza. "Direct numerical simulation of multi-phase flow in complex media." Doctoral thesis, Universitat Politècnica de Catalunya, 2022. http://hdl.handle.net/10803/673617.
Full textExisten numerosas aplicaciones industriales en las que transporte bifásico (líquido-gas) a escalas submilimétricas resulta crucial para la determinación del comportamiento del sistema en cuestión. Entre todas ellas, el presente trabajo se centra en las pilas de combustible con membrana de electrolito polimérico (PEMFC). El rendimiento deseable y la vida útil operativa de esta clase de dispositivos de conversión de energía de alto rendimiento requieren una gestión eficaz del agua (conocida como “water management”), que per se depende de la predicción adecuada de los mecanismos de transporte de agua y aire. Así pues, el análisis del flujo microfluídico de dos fases obliga considerar fuerzas y fenómenos interfaciales, tales como la histéresis, que están asociados con las propiedades fisicoquímicas del líquido, el gas y, si está presente, el sustrato sólido. En este contexto, la modelización numérica es una alternativa viable para obtener una predicción precisa de los mecanismos de transporte, especialmente en aquellos casos en los que los análisis experimentales son prohibitivos, ya sea por su complejidad o coste económico. En este trabajo, se desarrolla un marco eficiente, basado en la combinación del método de elementos finitos y el método de “level-set”, para la simulación tridimensional de flujos bifásicos. Con el fin de lograr una herramienta numérica robusta para aplicaciones prácticas, las complejidades físicas se incluyen consistentemente y los problemas numéricos involucrados se abordan adecuadamente. Concretamente, la discontinuidad de la presión en la interfaz líquido-gas se captura consistentemente utilizando un espacio de elementos finitos enriquecido. La estabilización del método se consigue mediante la introducción de la técnica de multiescalas variacionales. Asimismo, se propone también un tratamiento novedoso para el problema de la inestabilidad de tipo “small-cut”. Se muestra que el modelo propuesto puede proporcionar resultados precisos minimizando las corrientes espurias en la interfaz liquido-gas. Complementariamente, se presenta una nueva metodología para filtrar el ruido en el campo de “level-set”. Esta metodología resulta ser crucial para prevenir las irregularidades provocadas por el remanente persistente de las corrientes espurias. El comportamiento de la línea de contacto es considerado a través de la inclusión los modelos correspondientes en la formulación variacional. A este respecto, el presente trabajo aborda la importancia de la inclusión de la hidrodinámica subelemental. Los resultados presentados se basan en la combinación de la cinética molecular linealizada y las teorías hidrodinámicas. Para representación del comportamiento realista de los líquidos en contacto con sustratos sólidos, el fenómeno de histéresis del ángulo de contacto se tiene en cuenta imponiendo un mecanismo de anclado / desanclado consistente desarrollado en el marco del método de level-set. Aparte de los desarrollos principales, también se propone una técnica novedosa para la convección de la función ”level-set”. Ésta permite mejorar significativamente la precisión, minimizando a su vez la pérdida en las características geométricas de la interfaz asociadas al transporte. Esta nueva metodología está basada en el algoritmo de corrección de compensación de errores (BFECC). La herramienta numérica desarrollada en esta tesis es validada para varios casos que involucran burbujas de gas en un líquido y pequeñas gotas de líquido en un gas. Para el último escenario, además de las gotas libres, se evalúa la precisión de la herramienta propuesta para capturar la dinámica de las gotas sobre sustratos sólidos. A continuación, se analiza el rendimiento del modelo para capturar la configuración de una gota de agua sobre un sustrato inclinado en presencia de la histéresis del ángulo de contacto. El método propuesto finalmente se aplica
Enginyeria civil
Yang, Yihong. "Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77056.
Full textPh. D.
Ben, Dhia Zakaria. "Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34924.
Full textMaru, Wessenu-Abegaz. "Modelling two-phase flow and transport effects of multi-component fuels." Thesis, Cranfield University, 2005. http://hdl.handle.net/1826/3936.
Full textSederman, Andrew John. "MRI studies of single and multi-phase flow in porous media." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624232.
Full textIto, Kei. "Study on high-precision numerical algorithms for multi-phase flow analyses." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/126506.
Full textNadim, Nima. "Fluid and thermal behaviour of multi-phase flow through curved ducts." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/794.
Full textAkartuna, Sevket Ersin. "Identification of phase flow rates in oil-gas-water flow from turbulent capacitance and pressure signals." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321627.
Full textHadded, O. "A packaged laser instrument for drop size and velocity measurements in two-phase flow." Thesis, Bucks New University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372321.
Full textFERNANDES, LEONARDO SOARES. "STEREO-PIV LIQUID VELOCITY MEASUREMENTS IN TWO-PHASE, INTERMITENT FLOW IN A HORIZONTAL PIPE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31013@1.
Full textCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
BOLSA NOTA 10
Escoamentos intermitentes gás-líquido são encontrados em diversas aplicações de engenharia, como em linhas de produção de petróleo e em sistemas de refrigeração de reatores nucleares. O conhecimento detalhado deste padrão de escoamento é indispensável para a construção de modelos matemáticos representativos deste fenômeno físico complexo. No presente trabalho, foi desenvolvido um estudo experimental com o objetivo de fornecer informações que possibilitem a melhoria dos modelos existentes para o escoamento bifásico intermitente em duto horizontal. A técnica de velocimetria por imagem de partículas estereoscópica (SPIV) de alta frequência foi empregada, em conjunto com a técnica de fluorescência induzida por laser (LIF), permitindo a obtenção de campos de velocidade na região do pistão de líquido, a jusante da bolha alongada, e na região do filme líquido, a montante da bolha. O arranjo experimental possibilitou a medição das três componentes do vetor velocidade do escoamento bifásico água-glicerina e ar na seção transversal de uma tubulação horizontal de 40mm de diâmetro interno. Os resultados obtidos, originais na literatura, mostraram a evolução detalhada das três componentes dos campos médios do vetor velocidade ao longo da passagem da bolha alongada durante o escoamento intermitente.
Gas-liquid intermittent flows can be found in many engineering applications, such as oil production lines and nuclear reactors cooling systems. The detailed knowledge of this flow pattern is necessary for the development of accurate mathematical models of this complex phenomenon. In this work, an experimental study was developed with the goal to provide data that could be used to improve the existing models for two-phase intermittent flow in horizontal pipes. The high-frequency stereoscopic particle image velocimetry (SPIV) technique was employed along with the laser induced fluorescence (LIF) technique, allowing the measurement of velocity fields in the liquid slug, downstream of the elongated bubble, and in the liquid film, upstream of the elongated bubble. The experimental arrangement allowed the measurement of the three components of the velocity vector in an intermittent two-phase water-glycerine and air flow, in a transversal sections of a 40mm internal diameter horizontal pipe. The results obtained revealed original detailed information on the evolution of the three components of the averaged velocity field associated with the passage of the elongated bubble characteristic of the intermittent flow.
Johansen, James Paul. "Full-scale two-phase flow measurements using optical probes on Athena II research vessel." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/523.
Full textBiswas, Souvik. "Direct numerical simulation and two-fluid modeling of multi-phase bubbly flows." Link to electronic thesis, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-050307-224407/.
Full textKeywords: Multiphase flow; Two-fluid modeling; Direct numerical simulation; Two fluid modeling. Includes bibliographical references (leaves 116-119).
Kronbichler, Martin. "Numerical methods for the Navier-Stokes equations applied to turbulent flow and to multi-phase flow /." Licentiate thesis, Uppsala : Uppsala University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-110246.
Full textKleinberg, Michael R. Miu Karen Nan. "Distributed multi-phase distribution power flow : modeling, solution algorithm, and simulation results /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1307.
Full textJohansson, Mats. "Simulation of a multi phase flow in a rotating-lid driven cylinder." Thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-82177.
Full textGhafouri, H. R. "Finite element modelling of multi-phase flow through deformable fractured porous media." Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637047.
Full textKollmeier, Jost M. [Verfasser]. "Multi-Directional Phase-Contrast Flow MRI in Real Time / Jost M. Kollmeier." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1225936535/34.
Full textShahmohamadi, Hamed. "Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18460.
Full textHe, Xin. "Robust preconditioning methods for algebraic problems, arising in multi-phase flow models." Licentiate thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-151683.
Full textSiegel, John Mather Jr. "Magnetic resonance imaging of flow through a stenosis : accuracy of angiography and phase velocity measurements." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17626.
Full textJUNIOR, ROBERTO DA FONSECA. "INSTANTANEOUS LIQUID VELOCITY FIELD MEASUREMENTS IN TWO-PHASE INTERMITTENT FLOW THROUGH HORIZONTAL AND INCLINED PIPES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15406@1.
Full textinstantaneous liquid velocity fields at the film, nose and tail regions of slugs in horizontal and inclined two phase flow. To this end, a combination of three nonintrusive optical techniques was employed. Two-dimensional particle image velocimetry (PIV) was used to measure the instantaneous liquid velocity field at a meridional plane of the horizontal pipe test section, while a synchronized pulsed back lighting, provided by a matrix of red LED s, illuminated the bubble contours thereby enhancing contrast of the interfaces (Pulsed Shadow Technique - PST). A laser-induced fluorescence technique (LIF) was employed to separate the strong reflections coming from the gas-liquid interfaces produced by the green PIV laser, The tests were conducted on a specially built transparent pipe test section, using air and water as the working fluids. The velocity fields were obtained for flow regimes where the slugs were lightly aerated. The velocity field results in the nose, tail and film regions revealed valuable detailed information that helped to better understand the physics of the flow, besides contributing to the formation of a data bank for supporting the development of two-phase, horizontal slug flow simulations. The work conducted also provided statistical information on the main global variables that characterize the flow, such as, speed and length of gas bubbles and liquid slugs, and the frequency of passage of these structures.
Silas, Kevin Alexander. "Phase Transform Time Delay Estimation to Counteract Spectral Haystacking Effects in Jet Exhaust Flow Measurements." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104892.
Full textMaster of Science
This study builds on a Computational Tomography (CT) technique that uses an acoustic signal and an array of receivers to measure the velocity and temperature of a gas flow field. In particular, the velocity and temperature field tested involves multiple turbulent and disruptive elements, requiring a loud and specifically designed signal. As such, a novel acoustic signal generator, the dual Hartmann generator, was designed that is both loud and produces a specific two-toned signal. The key contribution of the study was to process the data, comparing the sets of transmitted and received signals, in order to estimate the time delay amongst receiver pairs – a key input in the CT method. Traditional cross-correlation methods were inadequate, and multiple alternatives were evaluated. The Phase Transform (PHAT) technique showed the most promise, and an explanation is given for why this technique is most suitable for this type of signal.
Shimizu, Yuma. "Enhanced Particle Methods with Highly-Resolved Phase Boundaries for Incompressible Fluid Flow." Kyoto University, 2019. http://hdl.handle.net/2433/244528.
Full textHron, Pavel [Verfasser], and Peter [Akademischer Betreuer] Bastian. "Numerical Simulation of Multi-Phase Multi-Component Reactive Flow in Porous Media / Pavel Hron ; Betreuer: Peter Bastian." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180500148/34.
Full textWang, Qiang. "A data fusion and visualisation platform for multi-phase flow by electrical tomography." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18436/.
Full textAl-Hinai, Suleiman Mohammed. "Multi-phase fluid flow properties of fault rocks : implication for production simulation models." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581870.
Full textMarashdeh, Qussai. "Validation of Electrical Capacitance Volume Tomography with Applications to Multi-Phase Flow Systems." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1244652779.
Full textHansen, Laura C. "Phase Locked Flow Measurements of Steady and Unsteady Vortex Generator Jets in a Separating Boundary Layer." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd763.pdf.
Full textBonuccelli, 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.
Full textLu, Yong. "Investigation of the particle dynamics of a multi-component solid phase in a dilute phase pneumatic conveying system." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3894.
Full textXie, Tao. "Hydrodynamic characteristics of gas/liquid/fiber three-phase flows based on objective and minimally-intrusive pressure fluctuation measurements." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-09192004-033703/unrestricted/xie%5Ftao%5F200412%5Fphd.pdf.
Full textD. William Tedder, Committee Member ; Minami Yoda, Committee Member ; Tom McDonough, Committee Member ; Andrei G. Fedorov, Committee Member ; S. Mostafa Ghiaasiaan, Committee Chair ; Seppo Karrila, Committee Member. Includes bibliographical references.