Numerical Simulation Of Twophase Slug Flow In Horizontal And Nearly Horizontal Pipes
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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.
Numerical Simulation Of Slug Flow In Horizontal Pipes And Comparison With Slug Frequency Prediction Methods From Literature
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Author : Florian Webner
language : en
Publisher:
Release Date : 2023
Numerical Simulation Of Slug Flow In Horizontal Pipes And Comparison With Slug Frequency Prediction Methods From Literature written by Florian Webner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 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.
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.
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.
An Experimental And Numerical Investigation Of Two Phase Slug Flow In A Vertical Tube
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Author : Julio Manuel Mendes DeJesus
language : en
Publisher:
Release Date : 1997
An Experimental And Numerical Investigation Of Two Phase Slug Flow In A Vertical Tube written by Julio Manuel Mendes DeJesus 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.
The multi-dimensional liquid velocity field and interfacial configuration of Taylor bubbles rising in stagnant kerosene in a vertical 25.6 mm I.D. pipe was investigated experimentally with a non-intrusive flow visualization technique based on photochromic dye activation, and numerically using a computer program for incompressible flows with free surfaces. The experimental results show that a change in flow direction of the liquid occurred at the nose of the Taylor bubble. From the nose, the liquid film accelerated downwards as the velocity profile became characteristic of developing falling film flow. At the tail, the liquid film penetrated into the wake creating vortices of different sizes. The film penetration distance in the wake region was not proportional to the film velocity, and therefore the bubble length. Within 1 to 1.5 tube diameters (26-38 mm) below the tail of the Taylor bubble, the vortices rapidly decayed and the liquid near the wall returned to essentially a stagnant state. However, small vortices in the bulk fluid remained visible up to 100 mm behind the Taylor bubble. An analysis of the flow revealed the liquid film surrounding the neatly cylindrical portion of the Taylor bubble to be approximately one-dimensional, whereas near the nose and in the wake it was highly two-dimensional. Furthermore, the velocity in the wake region was determined to be qualitatively similar for different runs. A simple predictive procedure for estimating the radially averaged streamwise film velocity and Taylor bubble shape concluded that the boundary-layer development at the pipe wall only influenced the falling film velocity. The numerical simulation of the Taylor bubble flow was conducted using the volume-of-fluid approach. However, the range of physical property values that yielded stable numerical results for the inertia-controlled rise of the bubble was severely limited, due to significant stability problems. The Taylor bubble shape was well predicted and velocity profiles in the liquid surrounding the Taylor bubble were computed with partial success for the first time in comparison with measured results. The flow in the wake was only qualitatively similar to the experimental data.
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.
Two Phase Flow Studies In Horizontal Pipes With Special Reference To Bubbly Mixtures
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Author : Walter James
language : en
Publisher:
Release Date : 1958
Two Phase Flow Studies In Horizontal Pipes With Special Reference To Bubbly Mixtures written by Walter James and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with Two-phase flow categories.
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.
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