Analysis Of Slug Flow In Horizontal Pipelines By The Two Fluid Model

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Analysis Of Slug Flow In Horizontal Pipelines By The Two Fluid Model

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Author :
language : pt-BR
Publisher:
Release Date : 2004

Analysis Of Slug Flow In Horizontal Pipelines By The Two Fluid Model written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Diversos processos práticos apresentam uma seqüência de diferentes configurações de escoamentos bifásicos, com diferentes padrões de escoamento. Dependendo das razões entre as velocidades superficiais do gás e do líquido, diferentes padrões de escoamento bifásico podem ser encontrados. O padrão de escoamento slug pode ser formado a partir do padrão estratificado, devido ao crescimento das instabilidades hidrodinâmicas ou devido às ondulações noterreno onde se instala a tubulação. O presente trabalho consiste na análise do escoamento bifásico no padrão slug, ao longo de tubulações horizontais, mediante a aplicaçãodo modelo de dois fluidos em sua forma transiente e unidimensional. Através de uma análise de estabilidade de Kelvin-Helmholtz para escoamento estratificado, estima-se a possível faixa de operação para a obtenção de um modelomatemático bem posto. Diferentes técnicas de discretização foram implementadas e testadas. Comparações com dados disponíveis na literatura foram realizadas.

A Study Of Terrain Induced Slugging In Two Phase Flow Pipelines

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Author : Vincent De Henau
language : en
Publisher:
Release Date : 1992

A Study Of Terrain Induced Slugging In Two Phase Flow Pipelines written by Vincent De Henau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

Computational Fluid Dynamics Cfd To Simulate Slug Flow In Horizontal Pipeline And Annular Pipe

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Author : Hassn Hadia
language : en
Publisher:
Release Date : 2018

Computational Fluid Dynamics Cfd To Simulate Slug Flow In Horizontal Pipeline And Annular Pipe written by Hassn Hadia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Slug flow can emerge as a factor in several industrial processes, especially in the oil and gas (O&G) industry. However, because of the complications that are inherent in multiphase flow, finding or developing a viable analysis tool has thus far proven elusive. For the past few decades, computational fluid dynamics (CFD) has served as the preferred approach in the flow analysis of single phase flow, yet it is only now beginning to be used in multiphase flow. Therefore, if CFD is to be adopted on a larger scale in the (O&G) industry, it is imperative that we first explore the wide variety of models currently existing in the commercial realm. This thesis investigates the commercial CFD package ANSYS 16.2 analysis of (air-water slug flow) and (water-sand slurry flow) inside a horizontal pipe (2-15 m long with a 0.05-0.059 m internal diameter) and an annular pipe (2- 4.5 m long, 0.02- 0.088 m inner and 0.04-0.12 m outer diameter). A range of two-phase air/water flow simulations is carried out using the Eulerian model with the Reynolds Stress Model (RSM), and the volume of fluid (VOF) model with the Shear-Stress-Transport (SST) model option of turbulence. The aim is to simulate a range of fluid velocities between 1.66 and 7 m/s and a range of gas velocities between 0.55 and 11 m/s. Additional investigations include comparing CFD predictions along with experimental measurements in the literature and performing sensitivity studies. In the present work, the impact from fluid-structure interaction (FSI) is demonstrated by using a 2-way coupling in ANSYS, effectively joining CFD and structural analysis. At the same time, stress and pressure changes are measured, along with the deformational structural response arising from unsteady multiphase flow. It is hoped that the outcome of this study will assist engineers and researchers in making better decisions in terms of operation, design, and sizing of two-phase flow systems, as these systems have broad and promising applications in subsea (O&G) pipelines.

Closure Relations Of The One Dimensional Two Fluid Model For The Simulation Of Slug Flows

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Author :
language : en
Publisher:
Release Date : 2011

Closure Relations Of The One Dimensional Two Fluid Model For The Simulation Of Slug Flows written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Stochastic Tools In Turbulence

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Author : John L. Lumley
language : en
Publisher: Courier Corporation
Release Date : 2007-01-01

Stochastic Tools In Turbulence written by John L. Lumley and has been published by Courier Corporation this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-01 with Science categories.

This accessible treatment offers the mathematical tools for describing and solving problems related to stochastic vector fields. Advanced undergraduates and graduate students will find its use of generalized functions a relatively simple method of resolving mathematical questions. It will prove a valuable reference for applied mathematicians and professionals in the fields of aerospace, chemical, civil, and nuclear engineering. The author, Professor Emeritus of Engineering at Cornell University, starts with a survey of probability distributions and densities and proceeds to examinations of moments, characteristic functions, and the Gaussian distribution; random functions; and random processes in more dimensions. Extensive appendixes—which include information on Fourier transforms, tensors, generalized functions, and invariant theory—contribute toward making this volume mathematically self-contained.

Numerical Simulation Of Twophase Slug Flow In Horizontal And Nearly Horizontal Pipes

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Author :
language : pt-BR
Publisher:
Release Date : 2002

Numerical Simulation Of Twophase Slug Flow In Horizontal And Nearly Horizontal Pipes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Escoamentos bifásicos no regime de golfadas são caracterizados pelaalternância de pacotes de líquido e grandes bolhas de gás na tubulação, sendoassociados a altas perdas de carga, além de trazer uma indesejada intermitênciaaos escoamentos. O desenvolvimento do regime de golfadas em tubulaçõeshorizontais se dá a partir do escoamento estratificado em decorrência de doisfatores: do crescimento natural de pequenas perturbações (por um mecanismo deinstabilidade do tipo Kelvin-Helmholtz) ou devido à acumulação de líquidocausada por mudanças de inclinação no perfil do duto. O presente trabalhoconsiste da simulação numérica do surgimento das golfadas em ambas assituações descritas acima, assim como do subseqüente desenvolvimento doescoamento neste padrão para um regime estatisticamente permanente. Aprevisão do escoamento é obtida utilizando-se uma formulação unidimensionalbaseada no Modelo de Dois Fluidos. Parâmetros médios das golfadas(comprimento, velocidade e freqüência) são comparados com estudos numéricose experimentais da literatura, obtendo-se uma concordância bastante satisfatória, especialmente dada a simplicidade de uma formulação unidimensional.

Fundamentals Of Multiphase Flow

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Author : Christopher E. Brennen
language : en
Publisher: Cambridge University Press
Release Date : 2005-04-18

Fundamentals Of Multiphase Flow written by Christopher E. Brennen and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-04-18 with Science categories.

Publisher Description

Slug Flow Simulation In Inclined Pipes

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Author : Seungyong Chang
language : en
Publisher:
Release Date : 1993

Slug Flow Simulation In Inclined Pipes written by Seungyong Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Multiphase flow categories.

Piv Investigations On Secondary Flow Structures In Horizontal Slug Flows

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Author : Pedro José Aguas Fernández
language : en
Publisher:
Release Date : 2011

Piv Investigations On Secondary Flow Structures In Horizontal Slug Flows written by Pedro José Aguas Fernández and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Liquid and gas phases circulate horizontally through the same channel in many industrial processes. They can do it following different patterns of so-called two-phase flow. Depending on the superficial velocity of each one of the phases, the flow can vary. The different types of flows observed in horizontal pipes are bubbly flow, stratified flow,wavy flow, slug flowand annular flow. The first formal classification of flow patterns was carried out by Taitel and Dukler during the 1970s [TNA78]. Slug flow is a phenomenon that has gained importance during the last decades in different technology fields. The two best-known areas where its analysis is of great importance are nuclear power plants and oil and gas extraction and distribution. In nuclear power plants that operate with boiling water (mainly PWR and BWR), vapor and liquid water circulate chaotically mixed till they arrive to an elbow or a U-tube where centrifugal forces lead to the separation of gas and liquid. From there, if the superficial velocities of the two phases belong to slug flow, whose water hammers could damage or eventually break the pipe, an undesired effect called LOCA (Loss Of Coolant Accident) could take place. Regarding oil and gas extraction and distribution, it is important to consider that from natural oilfields any extraction of hydrocarbons will consist on a mixture of components with different volatility; therefore, it will usually consist on liquids and gases flowing together, sometimes in slug flow and consequently provoking pressure peaks throughout the pipelines, which means lower pumping efficiency and potential damage for the distribution materials. The study of slug onset is especially interesting because if it were avoided or controlled by artificial means, all the dangers described in the paragraph above would automatically disappear. Rafi Ahmed and Sanjoy Banerjee developed a theoretical method to predict the onset of slugs based on instabilities in the amplitude of waves in 1985, the so-called Kelvin-Helmholtz instabilities [AB85]. This slug onset mechanism was accepted by most authors, but its wavelength dependence contradicted the experimental data. Therefore, a theoretical model using the concept of energy balance and taking into account the shear stresses was developed by Chun and Lee in 1996 [CL96]. Hurlburt and Hanratty investigated the transition from slug to plug flow, which differs from slug in its lack of air within the liquid body, using slug stability in 2001 [HH02] and so helping to define the boundary conditions of slug flow. Regarding measurement techniques for the analysis of slugs, 2D PIV (Particle Image Velocimetry) started being used in the late 1970s and is the most common technique nowadays since it allows highlighting the right number of particles for the study of the flow dynamics. It consists on the introduction in the fluid of tracer particles that can be identified due to their luminescence when a laser plane intersects the flow. In addition, a recording system consisting of one or more cameras with a high shooting frequency provides accurate sequences of pictures that can be processed by suitable software to determine velocity fields based on the path followed by the tracer particles.Another technique based on the same principle and used in the investigations of flow dynamics is Stereo PIV. In this case, two cameras are needed and the target of the laser is a plane perpendicular set to the axis of the tube. Although in this way more information about the secondary flows can be determined, this method requires a very accurate and difficult calibration of the recording system and at least two cameras with a perfect synchronization in time. Besides, the processing of the images obtained with Stereo PIV needs to be treated and correlated through a more time-demanding process than 2D PIV. Though Stereo PIV has been used in the analysis of pipe flow since 2003 with the work of Van Doornel [vDHLÅ03], it has been applied for the first time in the Chair of Thermodynamics of the Technische Universität München for the investigation of two-phase flow [CUS11]. The scope of this work is the further investigation of slug onset and its description including secondary effects such as turbulences, a characteristic that has never been illustrated about slug flow. For this purpose, images obtained with 2D PIV and Stereo PIV will be used. To enhance the quality of the results, the first task will be the development of suitable software to avoid false velocity vectors produced by reflection and refraction, to overlap several pairs of images obtained by different cameras simultaneously and to treat the data gained after PIV computerized analysis. Moreover, a new kind of graphical representations that reveal a deep insight in the velocity fields of slug flow will be shown.

An Experimental Study On Slug Flow In Horizontal Pipelines

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Author : L. Latten
language : en
Publisher:
Release Date : 1997

An Experimental Study On Slug Flow In Horizontal Pipelines written by L. Latten and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.