Dynamic Modeling Strategy For Flow Regime Transition In Gas Liquid Two Phase Flows

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Dynamic Modeling Strategy for Flow Regime Transition in Gas-Liquid Two-Phase Flows

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Dynamic Modeling Strategy for Flow Regime Transition in Gas-Liquid Two-Phase Flows by :

Download or read book Dynamic Modeling Strategy for Flow Regime Transition in Gas-Liquid Two-Phase Flows written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In modeling gas-liquid two-phase flows, the concept of flow regime has been used to characterize the global interfacial structure of the flows. Nearly all constitutive relations that provide closures to the interfacial transfers in two-phase flow models, such as the two-fluid model, are often flow regime dependent. Currently, the determination of the flow regimes is primarily based on flow regime maps or transition criteria, which are developed for steady-state, fully-developed flows and widely applied in nuclear reactor system safety analysis codes, such as RELAP5. As two-phase flows are observed to be dynamic in nature (fully-developed two-phase flows generally do not exist in real applications), it is of importance to model the flow regime transition dynamically for more accurate predictions of two-phase flows. The present work aims to develop a dynamic modeling strategy for determining flow regimes in gas-liquid two-phase flows through the introduction of interfacial area transport equations (IATEs) within the framework of a two-fluid model. The IATE is a transport equation that models the interfacial area concentration by considering the creation and destruction of the interfacial area, such as the fluid particle (bubble or liquid droplet) disintegration, boiling and evaporation; and fluid particle coalescence and condensation, respectively. For the flow regimes beyond bubbly flows, a two-group IATE has been proposed, in which bubbles are divided into two groups based on their size and shape (which are correlated), namely small bubbles and large bubbles. A preliminary approach to dynamically identifying the flow regimes is provided, in which discriminators are based on the predicted information, such as the void fraction and interfacial area concentration of small bubble and large bubble groups. This method is expected to be applied to computer codes to improve their predictive capabilities of gas-liquid two-phase flows, in particular for the applications in which flow regime transition occurs.

Methodology Development of a Gas-liquid Dynamic Flow Regime Transition Model

Author : Benjamin Casey Doup
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (9 download)

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Book Synopsis Methodology Development of a Gas-liquid Dynamic Flow Regime Transition Model by : Benjamin Casey Doup

Download or read book Methodology Development of a Gas-liquid Dynamic Flow Regime Transition Model written by Benjamin Casey Doup and published by . This book was released on 2014 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety codes often employ the one-dimensional two-fluid model to model two-phase flows. The area-averaged relative velocity correlation necessary to close this model is derived from the drift flux model. The effects of the necessary assumptions used to derive this correlation are investigated using local measurements and these effects are found to have a limited impact on the prediction of the area-averaged relative velocity.

Flow Regime Transitions for Vertical Upward Gas Liquid Flow

Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Flow Regime Transitions for Vertical Upward Gas Liquid Flow by :

Download or read book Flow Regime Transitions for Vertical Upward Gas Liquid Flow written by and published by . This book was released on 1977 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Two-Phase Gas-Liquid Flow in Pipes with Different Orientations

Author : Afshin J. Ghajar
Publisher : Springer Nature
ISBN 13 : 3030416267
Total Pages : 136 pages
Book Rating : 4.0/5 (34 download)

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Book Synopsis Two-Phase Gas-Liquid Flow in Pipes with Different Orientations by : Afshin J. Ghajar

Download or read book Two-Phase Gas-Liquid Flow in Pipes with Different Orientations written by Afshin J. Ghajar and published by Springer Nature. This book was released on 2020-03-14 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides design engineers using gas-liquid two-phase flow in different industrial applications the necessary fundamental understanding of the two-phase flow variables. Two-phase flow literature reports a plethora of correlations for determination of flow patterns, void fraction, two- phase pressure drop and non-boiling heat transfer correlations. However, the validity of a majority of these correlations is restricted over a narrow range of two -phase flow conditions. Consequently, it is quite a challenging task for the end user to select an appropriate correlation/model for the type of two-phase flow under consideration. Selection of a correct correlation also requires some fundamental understanding of the two-phase flow physics and the underlying principles/assumptions/limitations associated with these correlations. Thus, it is of significant interest for a design engineer to have knowledge of the flow patterns and their transitions and their influence on two-phase flow variables. To address some of these issues and facilitate selection of appropriate two-phase flow models, this volume presents a succinct review of the flow patterns, void fraction, pressure drop and non-boiling heat transfer phenomenon and recommend some of the well scrutinized modeling techniques.

Modelling and Experimentation in Two-Phase Flow

Author : Volfango Bertola
Publisher : Springer
ISBN 13 : 3709125383
Total Pages : 433 pages
Book Rating : 4.7/5 (91 download)

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Book Synopsis Modelling and Experimentation in Two-Phase Flow by : Volfango Bertola

Download or read book Modelling and Experimentation in Two-Phase Flow written by Volfango Bertola and published by Springer. This book was released on 2014-05-04 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an up-to-date review of recent advances in the study of two-phase flows, with focus on gas-liquid flows, liquid-liquid flows, and particle transport in turbulent flows. The book is divided into several chapters, which after introducing basic concepts lead the reader through a more complex treatment of the subjects. The reader will find an extensive review of both the older and the more recent literature, with abundance of formulas, correlations, graphs and tables. A comprehensive (though non exhaustive) list of bibliographic references is provided at the end of each chapter. The volume is especially indicated for researchers who would like to carry out experimental, theoretical or computational work on two-phase flows, as well as for professionals who wish to learn more about this topic.

Multiphase Flow Dynamics 2

Author : Nikolay Ivanov Kolev
Publisher : Springer Science & Business Media
ISBN 13 : 3642205984
Total Pages : 371 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis Multiphase Flow Dynamics 2 by : Nikolay Ivanov Kolev

Download or read book Multiphase Flow Dynamics 2 written by Nikolay Ivanov Kolev and published by Springer Science & Business Media. This book was released on 2011-11-03 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. .In its fourth extended edition the successful monograph package “Multiphase Flow Daynmics” contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations, providing a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present second volume the methods for describing the mechanical interactions in multiphase dynamics are provided. This fourth edition includes various updates, extensions, improvements and corrections. "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM In the present second volume the methods for describing the mechanical interactions in multiphase dynamics are provided. This fourth edition includes various updates, extensions, improvements and corrections. "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM

The Mathematical Modeling of Flow Regime Transition in Bubbly Two-phase Flows

Author : Susana Kalkach-Navarro
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Mathematical Modeling of Flow Regime Transition in Bubbly Two-phase Flows by : Susana Kalkach-Navarro

Download or read book The Mathematical Modeling of Flow Regime Transition in Bubbly Two-phase Flows written by Susana Kalkach-Navarro and published by . This book was released on 1992 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Two-Phase Flow

Author : Cl Kleinstreuer
Publisher : Routledge
ISBN 13 : 1351406485
Total Pages : 472 pages
Book Rating : 4.3/5 (514 download)

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Book Synopsis Two-Phase Flow by : Cl Kleinstreuer

Download or read book Two-Phase Flow written by Cl Kleinstreuer and published by Routledge. This book was released on 2017-11-01 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This graduate text provides a unified treatment of the fundamental principles of two-phase flow and shows how to apply the principles to a variety of homogeneous mixture as well as separated liquid-liquid, gas-solid, liquid-solid, and gas-liquid flow problems, which may be steady or transient, laminar or turbulent.Each chapter contains several sample problems, which illustrate the outlined theory and provide approaches to find simplified analytic descriptions of complex two-phase flow phenomena.This well-balanced introductory text will be suitable for advanced seniors and graduate students in mechanical, chemical, biomedical, nuclear, environmental and aerospace engineering, as well as in applied mathematics and the physical sciences. It will be a valuable reference for practicing engineers and scientists. A solutions manual is available to qualified instructors.

Two-phase Flow Modeling with Discrete Particles

Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Two-phase Flow Modeling with Discrete Particles by :

Download or read book Two-phase Flow Modeling with Discrete Particles written by and published by . This book was released on 1992 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of efficient heat exchangers in which the working fluid changes phase requires accurate modeling of two-phase fluid flow. The local Navier-Stokes equations form the basic continuum equations for this flow situation. However, the local instantaneous model using these equations is intractable for afl but the simplest problems. AH the practical models for two-phase flow analysis are based on equations that have been averaged over control volumes. These models average out the detailed description within the control volumes and rely on flow regime maps to determine the distribution of the two phases within a control volume. Flow regime maps depend on steady state models and probably are not correct for dynamic models. Numerical simulations of the averaged two-phase flow models are usually performed using a two-fluid Eulerian description for the two phases. Eulerian descriptions have the advantage of having simple boundary conditions, but the disadvantage of introducing numerical diffusion, i.e., sharp interfaces are not maintained as the flow develops, but are diffused. Lagrangian descriptions have the advantage of being able to track sharp interfaces without diffusion, but they have the disadvantage of requiring more complicated boundary conditions. This paper describes a numerical scheme and attendant computer program, DISCON2, for the calculation of two-phase flows that does not require the use of flow regime maps. This model is intermediate between the intractable local instantaneous and the averaged two-fluid model. This new model uses a combination of an Eulerian and a Lagrangian representation of the two phases. The dispersed particles (bubbles or drops) are modeled individually using a large representative number of particles, each with their own Lagrangian description. The continuous phases (liquid or gas) use an Eulerian description.

Mathematical Modeling of Disperse Two-Phase Flows

Author : Christophe Morel
Publisher : Springer
ISBN 13 : 3319201042
Total Pages : 365 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Mathematical Modeling of Disperse Two-Phase Flows by : Christophe Morel

Download or read book Mathematical Modeling of Disperse Two-Phase Flows written by Christophe Morel and published by Springer. This book was released on 2015-07-17 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book develops the theoretical foundations of disperse two-phase flows, which are characterized by the existence of bubbles, droplets or solid particles finely dispersed in a carrier fluid, which can be a liquid or a gas. Chapters clarify many difficult subjects, including modeling of the interfacial area concentration. Basic knowledge of the subjects treated in this book is essential to practitioners of Computational Fluid Dynamics for two-phase flows in a variety of industrial and environmental settings. The author provides a complete derivation of the basic equations, followed by more advanced subjects like turbulence equations for the two phases (continuous and disperse) and multi-size particulate flow modeling. As well as theoretical material, readers will discover chapters concerned with closure relations and numerical issues. Many physical models are presented, covering key subjects including heat and mass transfers between phases, interfacial forces and fluid particles coalescence and breakup, amongst others. This book is highly suitable for students in the subject area, but may also be a useful reference text for more advanced scientists and engineers.

Multiphase Flow Dynamics

Author : Marcio Ferreira Martins
Publisher : Springer Nature
ISBN 13 : 303093456X
Total Pages : 342 pages
Book Rating : 4.0/5 (39 download)

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Book Synopsis Multiphase Flow Dynamics by : Marcio Ferreira Martins

Download or read book Multiphase Flow Dynamics written by Marcio Ferreira Martins and published by Springer Nature. This book was released on 2022-04-01 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents isothermal and non-isothermal multiphase flows with and without phase change or chemical reactions. Six main axes of multiphase flow are covered in a strategic order: Multiphase Flow in Industry, Multiphase Flow Measurement and Instrumentation, Multiphase Flow With Phase Change & Chemical Reactions, Multiphase Flow Modeling, Experimental Multiphase Flow, and Wet and Dry Particulate Systems. Each part is opened by mini-reviews written by internationally prominent researchers from the academy and industry. The content is of interest to researchers and engineers working in mining, oil and gas, power, nuclear, chemical process, space, food, biomedical, micro and nanotechnology, and other industries.

Thermo-fluid Dynamics of Two-Phase Flow

Author : Mamoru Ishii
Publisher : Springer Science & Business Media
ISBN 13 : 0387291873
Total Pages : 462 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis Thermo-fluid Dynamics of Two-Phase Flow by : Mamoru Ishii

Download or read book Thermo-fluid Dynamics of Two-Phase Flow written by Mamoru Ishii and published by Springer Science & Business Media. This book was released on 2006-09-28 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

The Development of Multidimensional Two-fluid Modeling Capabilities

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis The Development of Multidimensional Two-fluid Modeling Capabilities by :

Download or read book The Development of Multidimensional Two-fluid Modeling Capabilities written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental problem in gas/liquid two-phase flow is the prediction of flow regime. Important macroscopic parameters such as pressure drop, wall heat transfer rate and critical heat flux (CHF) depend on the topology of the interface and the distribution of gas and liquid across the channel. The normal means of treating flow regimes is through a flow regime map, where a point in parameter space is assigned a flow regime, and the analysis proceeds based on models for the type of flow regime that is then appropriate. However, flow regime maps, and the models based on them do not work over a broad range of flows; indeed, the very concept of flow regime is limited in application to the particular geometry and range of conditions for which the flow regime map was developed. In addition, flow regime maps are not valid for transient conditions. The authors are developing a model for two-phase flow that is capable of describing the range of flow regimes observed in vertical pipe flow without reliance on a flow regime map. The model is capable of describing both steady and transient flows over a wide range of conditions, and consists of multidimensional equations of balance of mass, energy, and momentum for four fields; namely, continuous gas (cg), continuous liquid (cl), dispersed gas, or bubbles (dg), and dispersed liquid, or droplets (dl). To see that the four-field model is capable of predicting how given fluxes of gas and liquid distribute themselves in pipe or channel flow, consider the schematic of different flow regimes in figure 1. By describing the transverse distribution of bubbles and droplets being carried in continuous liquid and gas, respectively, most fundamental features of flow regimes can be captured. In addition, the local nature of the model requires distributed sources of mass and momentum for each field.

Two Phase Flow, Phase Change and Numerical Modeling

Author : Jeff Winters
Publisher :
ISBN 13 : 9781681176581
Total Pages : 280 pages
Book Rating : 4.1/5 (765 download)

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Book Synopsis Two Phase Flow, Phase Change and Numerical Modeling by : Jeff Winters

Download or read book Two Phase Flow, Phase Change and Numerical Modeling written by Jeff Winters and published by . This book was released on 2016-10-01 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: The heat transfer and analysis on laser beam, evaporator coils, shell-and-tube condenser, two phase flow, nanofluids, complex fluids, and on phase change are significant issues in a design of wide range of industrial processes and devices. The most common class of multiphase flows are two-phase flows. A gas-liquid flow is probably the most important form of multiphase flow, and is found widely in a whole range of industrial applications. These include pipeline systems for the transport of oil-gas mixtures, evaporators, boilers, condensers, submerged combustion systems, sewerage treatment plants, air-conditioning and refrigeration plants, and cryogenic plants. Gas-liquid systems are also important in the meteorology and in other natural phenomena. Flows of solids suspended in gases are important in pneumatic conveying and in pulverized fuel combustion. Fluidized beds may also be regarded as a form of gas-solid flow. Liquid-liquid flows are the flow of oil-water mixtures in pipelines and in liquid-liquid solvent extraction mass transfer systems. The most important application of liquid-solid flow is in the hydraulic conveying of solid materials. Liquid-solid suspensions also occur in crystallization systems, and in hydro-cyclones. Historically, probably the most commonly studied cases of two-phase flow are in large-scale power systems. Coal and gas-fired power stations used very large boilers to produce steam for use in turbines.Two Phase Flow, Phase Change and Numerical Modeling covers mainly numerical modeling of heat transfer, two phase flow, nanofluids, and phase change.

Two-Phase Flows

Author : Shih-i Pai
Publisher : Springer-Verlag
ISBN 13 : 3322863484
Total Pages : 373 pages
Book Rating : 4.3/5 (228 download)

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Book Synopsis Two-Phase Flows by : Shih-i Pai

Download or read book Two-Phase Flows written by Shih-i Pai and published by Springer-Verlag. This book was released on 2013-07-02 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Two-phase Gas-liquid Flow in Pipes with Different Orientations

Author : Afshin Jahanshahi Ghajar
Publisher :
ISBN 13 : 9783030416270
Total Pages : 136 pages
Book Rating : 4.4/5 (162 download)

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Book Synopsis Two-phase Gas-liquid Flow in Pipes with Different Orientations by : Afshin Jahanshahi Ghajar

Download or read book Two-phase Gas-liquid Flow in Pipes with Different Orientations written by Afshin Jahanshahi Ghajar and published by . This book was released on 2020 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides design engineers using gas-liquid two-phase flow in different industrial applications the necessary fundamental understanding of the two-phase flow variables. Two-phase flow literature reports a plethora of correlations for determination of flow patterns, void fraction, two- phase pressure drop and non-boiling heat transfer correlations. However, the validity of a majority of these correlations is restricted over a narrow range of two -phase flow conditions. Consequently, it is quite a challenging task for the end user to select an appropriate correlation/model for the type of two-phase flow under consideration. Selection of a correct correlation also requires some fundamental understanding of the two-phase flow physics and the underlying principles/assumptions/limitations associated with these correlations. Thus, it is of significant interest for a design engineer to have knowledge of the flow patterns and their transitions and their influence on two-phase flow variables. To address some of these issues and facilitate selection of appropriate two-phase flow models, this volume presents a succinct review of the flow patterns, void fraction, pressure drop and non-boiling heat transfer phenomenon and recommend some of the well scrutinized modeling techniques.

Two-Phase Flow in Complex Systems

Author : Salomon Levy
Publisher : Wiley-Interscience
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Two-Phase Flow in Complex Systems by : Salomon Levy

Download or read book Two-Phase Flow in Complex Systems written by Salomon Levy and published by Wiley-Interscience. This book was released on 1999 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive, real-world look at two-phase flow systems-from one of the world's leading authorities on the subject. From his early works in the area of heat transfer research on boundary layer flows and two-phase flows to his role as one of the lead consultants following the Three Mile Island accident, internationally renowned engineer Salomon Levy has achieved an ideal balance of theory and practice in his engineering career. In Two-Phase Flow in Complex Systems, Dr. Levy's newest book, he draws on this breadth of experience to examine these systems in the real world. Two-Phase Flow in Complex Systems offers a unique look at two-phase flow phenomena (primarily gas and liquid) in a variety of systems, from water reactors to the global climate system. Focusing on the interaction and simultaneous behavior of all the components in a system, the book's approach departs significantly from conventional texts, which emphasize modeling of separate phenomena. The book begins with the formulation of an integrated program of experiments and analytical tools, and describes experimental aspects-specifically the scaling of test facilities-essential to representing the critical elements of the behavior of complex systems. Subsequent chapters: * Discuss system computer codes for predicting system behavior during transients and accidents. * Examine flow pattern maps and flow pattern models. * Describe typical limiting phenomena known to impact the safety and cost of complex systems (including countercurrent limiting conditions and critical or choking flow). The book also illustrates how the analysis used in understanding the dynamics of a nuclear power system can be applied to the entire global climate system, including the phenomenon of global warming.