Zero Gravity Two Phase Flow Regime Transition Modeling Compared With Data And Relap5 3d Predictions

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Zero Gravity Two-phase Flow Regime Transition Modeling Compared with Data and Relap5-3d Predictions

Author : Melissa Renee Ghrist
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (61 download)

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Book Synopsis Zero Gravity Two-phase Flow Regime Transition Modeling Compared with Data and Relap5-3d Predictions by : Melissa Renee Ghrist

Download or read book Zero Gravity Two-phase Flow Regime Transition Modeling Compared with Data and Relap5-3d Predictions written by Melissa Renee Ghrist and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis compares air/water two-phase flow regime transition models in zero gravity with data and makes recommendations for zero gravity models to incorporate into the RELAP5-3D thermal hydraulic computer code. Data from numerous researchers and experiments are compiled into a large database. A RELAP5-3D model is built to replicate the zero gravity experiments, and flow regime results from the RELAP5-3D code are compared with data. The comparison demonstrates that the current flow regime maps used in the computer code do not scale to zero gravity. A new flow regime map is needed for zero gravity conditions. Three bubbly-to-slug transition models and four slug-to-annular transition models are analyzed and compared with the data. A mathematical method is developed using least squares to objectively compare the accuracy of the models with the data. The models are graded by how well each represents the data. Agreement with data validates the recommendations made for changes to the RELAP5-3D computer code models. For smaller diameter tubes, Dukler0́9s bubbly-to-slug model best fits the data. For the larger tubes, the Drift Flux model is a better fit. The slug-to-annular transition is modeled best by Creare for small tubes and Reinarts for larger tubes. A major finding of this thesis work is that more air/water data is needed at equally distributed flow velocities and a greater variety of tube diameters. More data is specifically needed in the predicted transition regions made in this study.

The Continuum Modelling of Two-phase Flow Systems

Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis The Continuum Modelling of Two-phase Flow Systems by :

Download or read book The Continuum Modelling of Two-phase Flow Systems written by and published by . This book was released on 1992 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research program is concerned with the development of self-consistent multidimensional two-fluid models which predict a wide variety of data and satisfy all relevant physical laws and constraints. If successful, these models can revolutionize the way in which two-phase lows are analyzed, since mechanistic, rather than empirical-based predictions should be possible. During this report period the research has focused on understanding the relationships between the interfacial closure laws and the onset of ill-posedness. In particular, it is now known that only the void wave eigenvalues can become complex, thus leading to ill-posedness. As a consequence, a detailed set of void wave data were taken and these data were compared with the two-fluid model we have developed. The kinematic void wave data was well predicted, and, in addition, a much faster void wave was also measured. The faster void wave was associated with bubble clusters which were observed to form due to hydrodynamic effects. Significantly, these clusters were found to be the precursors of Taylor bubble formation (i.e., the bubbly-to-slug flow regime transition). Moreover, it was found that for certain conditions, these void waves were amplified, thus triggering flow regime transition. 2 refs.

Two-phase Stratified Flow Regime Transition Analysis for Low Gravity Conditions

Author : Kathryn M. Miller
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (256 download)

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Book Synopsis Two-phase Stratified Flow Regime Transition Analysis for Low Gravity Conditions by : Kathryn M. Miller

Download or read book Two-phase Stratified Flow Regime Transition Analysis for Low Gravity Conditions written by Kathryn M. Miller and published by . This book was released on 1990 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Energy Research Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 586 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Energy Research Abstracts by :

Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Two phase flow modeling

Author :
Publisher :
ISBN 13 :
Total Pages : 61 pages
Book Rating : 4.:/5 (752 download)

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Book Synopsis Two phase flow modeling by :

Download or read book Two phase flow modeling written by and published by . This book was released on 2006 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Design-basis Accident Analysis Methods For Light-water Nuclear Power Plants

Author : Robert Martin
Publisher : World Scientific
ISBN 13 : 9813275677
Total Pages : 717 pages
Book Rating : 4.8/5 (132 download)

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Book Synopsis Design-basis Accident Analysis Methods For Light-water Nuclear Power Plants by : Robert Martin

Download or read book Design-basis Accident Analysis Methods For Light-water Nuclear Power Plants written by Robert Martin and published by World Scientific. This book was released on 2019-02-13 with total page 717 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book captures the principles of safety evaluation as practiced in the regulated light-water reactor nuclear industry, as established and stabilized over the last 30 years. It is expected to serve both the current industry and those planning for the future. The work's coverage of the subject matter is the broadest to date, including not only the common topics of modeling and simulation, but also methods supporting the basis for the underlying assumptions, the extension to radiological safety, what to expect in a licensing review, historical perspectives and the implication for new designs.This text is an essential resource for practitioners and students, on the current best-practices in nuclear power plant safety and their basis. Contributors of this work are subject matter experts in their specialties, much of which was nurtured and inspired by Prof. Larry Hochreiter, a prominent nuclear safety pioneer.Related Link(s)

Modelling of Micro-gravity Two-phase Flow Regimes

Author : John M. Dzenitis
Publisher :
ISBN 13 :
Total Pages : 226 pages
Book Rating : 4.:/5 (186 download)

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Book Synopsis Modelling of Micro-gravity Two-phase Flow Regimes by : John M. Dzenitis

Download or read book Modelling of Micro-gravity Two-phase Flow Regimes written by John M. Dzenitis and published by . This book was released on 1988 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Stability Improvement of the One-dimensional Two-fluid Model for Horizontal Two-phase Flow with Model Unification

Author : Kent C. Abel
Publisher :
ISBN 13 :
Total Pages : 302 pages
Book Rating : 4.:/5 (636 download)

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Book Synopsis Stability Improvement of the One-dimensional Two-fluid Model for Horizontal Two-phase Flow with Model Unification by : Kent C. Abel

Download or read book Stability Improvement of the One-dimensional Two-fluid Model for Horizontal Two-phase Flow with Model Unification written by Kent C. Abel and published by . This book was released on 2005 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The next generation of nuclear safety analysis computer codes will require detailed modeling of two-phase fluid flow. The most complete and fundamental model used for these calculations is known as the two-fluid model. It is the most accurate of the two-phase models since it considers each phase independently and links the two phases together with six conservation equations. A major drawback is that the current two-fluid model, when area-averaged to create a one-dimensional model, becomes ill-posed as an initial value problem when the gas and liquid velocities are not equal. The importance of this research lies in obtaining a model that overcomes this difficulty. It is desired to develop a modified one-dimensional two-fluid model for horizontal flow that accounts for the pressure difference between the two phases, due to hydrostatic head, with the implementation of a void fraction distribution parameter. With proper improvement of the one-dimensional two-fluid model, the next generation of nuclear safety analysis computer codes will be able to predict, with greater precision, the key safety parameters of an accident scenario. As part of this research, an improved version of the one-dimensional two-fluid model for horizontal flows was developed. The model was developed from a theoretical point of view with the three original distribution parameters simplified down to a single parameter. The model was found to greatly enhance the numerical stability (hyperbolicity) of the solution method. With proper modeling of the phase distribution parameter, a wide range of flow regimes can be modeled. This parameter could also be used in the future to eliminate the more subjective flow regime maps that are currently implemented in today's multiphase computer codes. By incorporating the distribution parameter and eliminating the flow regime maps, a hyperbolic model is formed with smooth transitions between various flow regimes, eliminating the unphysical oscillations that may occur near transition boundaries in today's multiphase computer codes.

Nuclear Regulatory Commission Issuances

Author : U.S. Nuclear Regulatory Commission
Publisher :
ISBN 13 :
Total Pages : 950 pages
Book Rating : 4.3/5 (129 download)

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Book Synopsis Nuclear Regulatory Commission Issuances by : U.S. Nuclear Regulatory Commission

Download or read book Nuclear Regulatory Commission Issuances written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1979 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Boiling Heat Transfer for Cryogenics

Author : J. D. Seader
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Boiling Heat Transfer for Cryogenics by : J. D. Seader

Download or read book Boiling Heat Transfer for Cryogenics written by J. D. Seader and published by . This book was released on 1965 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive survey of available information from the literature on heat transfer to boiling hydrogen, nitrogen, and oxygen is presented. Included are a bibliography of available experimental data, a summary of boiling theory, graphical comparisons of the experimental data, and compilations of pertinent physical properties for each of the three cryogenic fluids. Based upon the results of the survey, recommendations are made for a test program to provide critical information there data are lacking.

Transport Phenomena in Multiphase Systems

Author : Amir Faghri
Publisher : Academic Press
ISBN 13 :
Total Pages : 1072 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Transport Phenomena in Multiphase Systems by : Amir Faghri

Download or read book Transport Phenomena in Multiphase Systems written by Amir Faghri and published by Academic Press. This book was released on 2006 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering students in a wide variety of engineering disciplines from mechanical and chemical to biomedical and materials engineering must master the principles of transport phenomena as an essential tool in analyzing and designing any system or systems wherein momentum, heat and mass are transferred. This textbook was developed to address that need, with a clear presentation of the fundamentals, ample problem sets to reinforce that knowledge, and tangible examples of how this knowledge is put to use in engineering design. Professional engineers, too, will find this book invaluable as reference for everything from heat exchanger design to chemical processing system design and more. * Develops an understanding of the thermal and physical behavior of multiphase systems with phase change, including microscale and porosity, for practical applications in heat transfer, bioengineering, materials science, nuclear engineering, environmental engineering, process engineering, biotechnology and nanotechnology * Brings all three forms of phase change, i.e., liquid vapor, solid liquid and solid vapor, into one volume and describes them from one perspective in the context of fundamental treatment * Presents the generalized integral and differential transport phenomena equations for multi-component multiphase systems in local instance as well as averaging formulations. The molecular approach is also discussed with the connection between microscopic and molecular approaches * Presents basic principles of analyzing transport phenomena in multiphase systems with emphasis on melting, solidification, sublimation, vapor deposition, condensation, evaporation, boiling and two-phase flow heat transfer at the micro and macro levels * Solid/liquid/vapor interfacial phenomena, including the concepts of surface tension, wetting phenomena, disjoining pressure, contact angle, thin films and capillary phenomena, including interfacial balances for mass, species, momentum, and energy for multi-component and multiphase interfaces are discussed * Ample examples and end-of-chapter problems, with Solutions Manual and PowerPoint presentation available to the instructors

Computational Methods for Multiphase Flow

Author : Andrea Prosperetti
Publisher : Cambridge University Press
ISBN 13 : 1139459902
Total Pages : 392 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Computational Methods for Multiphase Flow by : Andrea Prosperetti

Download or read book Computational Methods for Multiphase Flow written by Andrea Prosperetti and published by Cambridge University Press. This book was released on 2009-06-25 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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.

Process Modelling and Simulation

Author : César de Prada
Publisher : MDPI
ISBN 13 : 3039214551
Total Pages : 298 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Process Modelling and Simulation by : César de Prada

Download or read book Process Modelling and Simulation written by César de Prada and published by MDPI. This book was released on 2019-09-23 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since process models are nowadays ubiquitous in many applications, the challenges and alternatives related to their development, validation, and efficient use have become more apparent. In addition, the massive amounts of both offline and online data available today open the door for new applications and solutions. However, transforming data into useful models and information in the context of the process industry or of bio-systems requires specific approaches and considerations such as new modelling methodologies incorporating the complex, stochastic, hybrid and distributed nature of many processes in particular. The same can be said about the tools and software environments used to describe, code, and solve such models for their further exploitation. Going well beyond mere simulation tools, these advanced tools offer a software suite built around the models, facilitating tasks such as experiment design, parameter estimation, model initialization, validation, analysis, size reduction, discretization, optimization, distributed computation, co-simulation, etc. This Special Issue collects novel developments in these topics in order to address the challenges brought by the use of models in their different facets, and to reflect state of the art developments in methods, tools and industrial applications.

Post-Dryout Heat Transfer

Author : G.F. Hewitt
Publisher : Routledge
ISBN 13 : 1351423312
Total Pages : 446 pages
Book Rating : 4.3/5 (514 download)

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Book Synopsis Post-Dryout Heat Transfer by : G.F. Hewitt

Download or read book Post-Dryout Heat Transfer written by G.F. Hewitt and published by Routledge. This book was released on 2017-10-06 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of post-dryout heat transfer has generated great interest because of its importance in determining maximum clad temperature in nuclear reactor loss-of-coolant accidents (LOCAs). An associated phenomenon, the deterioration of heat transfer in boiling, is significant to other industrial sectors. This book provides comprehensive coverage of post-dryout heat transfer, discussing such essential topics as post-dryout heat transfer in dispersed flow, interpretation and use of transient data in surface rewetting by reinstatement of flow or by reducing heat flux, rod bundles, two-phase flow occurrences in the post-dryout region, various methods for predicting ""inverted annular flow,"" and new experiments for measuring thermodynamic nonequilibrium with probes in the channel. The book also presents a basis for independent safety assessment of nuclear reactors and chemical plant systems where post-dryout heat transfer may occur. Post-Dryout Heat Transfer will be a useful reference for researchers and professionals in the nuclear and chemical production industries.

Natural Circulation Phenomena and Modelling for Advanced Water Cooled Reactors

Author : International Atomic Energy Agency
Publisher :
ISBN 13 : 9789201274106
Total Pages : 423 pages
Book Rating : 4.2/5 (741 download)

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Book Synopsis Natural Circulation Phenomena and Modelling for Advanced Water Cooled Reactors by : International Atomic Energy Agency

Download or read book Natural Circulation Phenomena and Modelling for Advanced Water Cooled Reactors written by International Atomic Energy Agency and published by . This book was released on 2012 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on an IAEA coordinated research project focused on the use of passive safety systems and natural circulation to help meet the safety and economic goals of advanced nuclear power plants, this publication includes the identification and definition of the thermo-hydraulic phenomena that affect the reliability of passive safety systems, characterization of each phenomenon, integral tests to examine the passive systems and natural circulation, and a methodology for examining passive system reliability.

Non-Newtonian Flow and Applied Rheology

Author : R. P. Chhabra
Publisher : Elsevier
ISBN 13 : 0080564933
Total Pages : 750 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Non-Newtonian Flow and Applied Rheology by : R. P. Chhabra

Download or read book Non-Newtonian Flow and Applied Rheology written by R. P. Chhabra and published by Elsevier. This book was released on 2011-04-08 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book bridges the gap between the theoretical work of the rheologist, and the practical needs of those who have to design and operate the systems in which these materials are handled or processed. It is an established and important reference for senior level mechanical engineers, chemical and process engineers, as well as any engineer or scientist who needs to study or work with these fluids, including pharmaceutical engineers, mineral processing engineers, medical researchers, water and civil engineers. This new edition covers a considerably broader range of topics than its predecessor, including computational fluid dynamics modelling techniques, liquid/solid flows and applications to areas such as food processing, among others. * Written by two of the world's leading experts, this is the only dedicated non-Newtonian flow reference in print. * Since first publication significant advances have been made in almost all areas covered in this book, which are incorporated in the new edition, including developments in CFD and computational techniques, velocity profiles in pipes, liquid/solid flows and applications to food processing, and new heat/mass transfer methods and models. * Covers both basic rheology and the fluid mechanics of NN fluids ? a truly self-contained reference for anyone studying or working with the processing and handling of fluids