Numerical Modelling Of Transient Gas Liquid Flows Application To Stratified Slug Flow Regimes
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Numerical Modelling Of Transient Gas Liquid Flows Application To Stratified Slug Flow Regimes
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Author :
language : en
Publisher:
Release Date : 2006
Numerical Modelling Of Transient Gas Liquid Flows Application To Stratified Slug Flow Regimes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
A new methodology was developed for the numerical simulation of transient two-phase flow in pipes. The method combines high-resolution numerical solvers and adaptive mesh refinement (AMR) techniques, and can achieve an order of magnitude improvement in computational time compared to solvers using conventional uniform grids. After a thorough analysis of the mathematical models used to describe the complex behaviour of two-phase flows, the methodology was used with three specific models in order to evaluate the robustness and accuracy of the numerical schemes developed, and to assess the ability of these models to predict two physical flow regimes, namely stratified and slug flows. The first stage of the validation work was to examine the physical correlations required for an accurate modelling of the stratified smooth and wavy flow patterns, and a new combination of existing correlations for the wall and interfacial friction factors was suggested in order to properly predict the flow features of the experimental transient case investigated. The second and final phase of the work dealt with the complex and multi-dimensional nature of slug flow. This flow regime remains a major and expensive headache for oil producers, due to its unsteady nature and high-pressure drop. The irregular flow results in poor oil/water separation, limits production and can cause flaring. The modelling approached that was adopted here is based on the two-fluid model, which can theoretically follows each formed slug and predicts its evolution, growth and decay, as it moves along the pipe. However, the slug flow study, performed here through a test case above the Inviscid Kelvin-Helmholtz transition from stratified to slug flow, showed that the incompressible two-fluid model used is unable to accurately predict most of the features of this complex flow. Mechanisms such as the interfacial wave formation, the slug growth and propagation, although observed from the simulations, cannot be accuratel.
Numerical Modelling Of Transient Gas Liquid Flows Application To Stratified Slug Flow Regimes
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Author : Christian Omgba-Essama
language : en
Publisher:
Release Date : 2004
Numerical Modelling Of Transient Gas Liquid Flows Application To Stratified Slug Flow Regimes written by Christian Omgba-Essama 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.
Numerical Simulation Of Two Phase Gas Liquid Flows In Inclined And Vertical Pipelines
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Author :
language : en
Publisher:
Release Date : 2006
Numerical Simulation Of Two Phase Gas Liquid Flows In Inclined And Vertical Pipelines written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The present thesis describes the advances made in modelling two-phase flows in inclined pipes using a transient one-dimensional approach. The research is a developement of an existing numerical methodology, capable of simulating stratified and slugging two-phase flows in horizontal or inclined single pipes. The aim of the present work is to extend the capabilities of the approach in order (i) to account for the effect of the pipe topography in the numerical solution of the two-fluid model, and (ii) to simulate vertical bubbly twophase flows at various pressures in large diameter pipes, and (iii) to model stratified and terrain-induced slugging in two-phase flow pipelines made of several uphill, downhill and level sections. A transient compressible two-fluid model based on the one-dimensional form of the mass and momentum conservation equations for the gas and liquid phases, is developed to predict those flow configurations. The wall to fluid and the interphase interactions are accounted for by constitutive relations which are flow regime dependent. The conservation equations are discretized using a finite volume method. An algorithm is created to enable simulations on pipelines made of several sections, and account for the effect of the topography in the simulations. The methodology is applied to the compressible model in order to evaluate the robustness and accuracy of the numerical schemes, especially for the high-resolution Advection Upwinding Splitting Method (AUSM) associated to the compressible model. It also assesses the ability of the method to predict three physical flow regimes, namely stratified, bubbly and terrain-induced slug flows. The terrain-induced slugging study is performed on a slightly inclined ("1.5°) V-section system. The use of hydrodynamic slug correlations for hilly-terrain slugging is discussed. It shows to be conclusive with a good agreement with experimental measurements obtained for slug frequency and slug length predictions. Mechanisms.
Thermo Fluid Dynamics Of Two Phase Flow
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Author : Mamoru Ishii
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-09-28
Thermo Fluid Dynamics Of Two Phase Flow written by Mamoru Ishii and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-09-28 with Technology & Engineering categories.
This book has been written for graduate students, scientists and engineers who need in-depth theoretical foundations to solve two-phase problems in various technological systems. Based on extensive research experiences focused on the fundamental physics of two-phase flow, the authors present the detailed theoretical foundation of multi-phase flow thermo-fluid dynamics as they apply to a variety of scenarios, including nuclear reactor transient and accident analysis, energy systems, power generation systems and even space propulsion.
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
Oil Film Dynamics In Aero Engine Bearing Chambers
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Author : Amir Aleem Hashmi
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2012
Oil Film Dynamics In Aero Engine Bearing Chambers written by Amir Aleem Hashmi and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Science categories.
Aero engine bearing chambers are complex machine elements inside the engines, supporting up to three concentric shafts on bearings. For safety reasons, the aero engines always employ rolling-element type bearings and therefore require a sufficient oil supply for lubrication in order to guarantee a reliable operation. As a consequence, a complex two-phase flow consisting of oil and sealing air governs the bearing chambers. A highly dynamic oil film, flowing along the chamber walls, plays a vital role to fulfill the tasks of cooling, lubricating and cleaning the bearing chambers. The design and optimization process of the bearing chambers requires a detailed understanding in order to accurately simulate the film behaviour inside the bearing chambers. Based on the earlier experimental investigations, it is known that near the scavenge off-take a relatively thick film exists. The numerical model to simulate these films must therefore take into account the elliptical behaviour of such films. Among the different models, the Volume Of Fluid (VOF) Model offers the best compromise between accuracy and efforts. However, preliminary attempts to model a fully developed and turbulent test case from literature revealed an unphysical pressure drop and velocity profile in the gas phase above the film flow. An inadequate turbulence modelling near the gas-liquid interface was identified as the problem source. The 2-Equation turbulence models (k- epsilon & k- omega) were extended to achieve a substantial improvement.
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.
Numerical Modeling And Experimental Investigation Of Gas Liquid Slug Formation In A Microchannel T Junction
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Author : Rafael Mattos dos Santos
language : en
Publisher:
Release Date : 2007
Numerical Modeling And Experimental Investigation Of Gas Liquid Slug Formation In A Microchannel T Junction written by Rafael Mattos dos Santos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Gas-liquid two-phase flow in a microfluidic T-junction with nearly square microchannels of 113 mum hydraulic diameter was investigated experimentally and numerically. Air and water superficial velocities were 0.018-0.791 m/s and 0.042-0.757 m/s, respectively. Three-dimensional modeling was performed with computational fluid dynamics (CFD) package FLUENT and the volume-of-fluid (VOF) model. 3D modeling resolved surface tension effects more accurately than 2D simulation. Slug flow (snapping/breaking/jetting) and stratified flow were observed experimentally. From numerical results void fraction followed a linear relationship with the homogeneous void fraction; two-phase frictional pressure drop fitted the Lockhart-Martinelli correlation with a Chisholm constant of 5; and the contact angle value affected the shape and size of gas slugs and determined the occurrence of liquid film and corner flow. Correlations were developed for prediction of flow parameters. Higher experimental velocity slip caused by gas inlet pressure build-up can result in deviation from numerical predictions.
Multiphase Science And Technology
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Author : G.F. Hewitt
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Multiphase Science And Technology written by G.F. Hewitt and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
This is the second volume of Multiphase Science and TechnoJogy, a new international series of books intended to provide authoritative overviews of im portant areas in multiphase systems. The alm is to have systematic and tutorial presentations of the state of knowledge in various areas. The objective of the chapters is to allow the nonspecialist reader to gain an up-to-date idea of the present state of development in a given subject. The response to Volume 1 of the se ries has been very positive, and we believe that the present volume will be equally weil received. Volume 1 was concerned entirely with gas-liquid systems, and the first four chapters of the present volume also relate to such systems. However, the inten tion of the se ries is to cover a wide range of multiphase systems, and we are, therefore, pleased to include in the present volume chapters that refer to liquid liquid and gas-solid multiphase flows, respectively. The first chapter in the present volume is by Professor A. E. Dukler of the University of Houston, Texas, and Professor Y. Taitel of Tel-Aviv University, Israel.
Computational Methods For Multiphase Flow
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Author : Andrea Prosperetti
language : en
Publisher: Cambridge University Press
Release Date : 2009-06-25
Computational Methods For Multiphase Flow written by Andrea Prosperetti 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 2009-06-25 with Mathematics categories.
Thanks to high-speed computers and advanced algorithms, the important field of modelling multiphase flows is an area of rapid growth. This one-stop account – now in paperback, with corrections from the first printing – is the ideal way to get to grips with this topic, which has significant applications in industry and nature. Each chapter is written by an acknowledged expert and includes extensive references to current research. All of the chapters are essentially independent and so the book can be used for a range of advanced courses and the self-study of specific topics. No other book covers so many topics related to multiphase flow, and it will therefore be warmly welcomed by researchers and graduate students of the subject across engineering, physics, and applied mathematics.