[PDF] Multiphase Flow In Complex Fracture Apertures Under A Wide Range Of Flow Conditions eBook

Author : Daniel H. Rothman
Publisher :
Page : pages
File Size : 16,89 MB
Release : 2006
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ISBN :

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A better understanding of multiphase flow through fractures requiresknowledge of the detailed physics of interfacial flows at themicroscopic pore scale. The objective of our project was to developtools for the simulation of such phenomena. Complementary work wasperformed by a group led by Dr.~Paul Meakin of the Idaho NationalEngineering and Environmental Laboratory. Our focus was on the lattice-Boltzmann (LB) method. In particular, westudied both the statics and dynamics of contact lines where twofluids (wetting and non-wetting) meet solid boundaries. Previous workhad noted deficiencies in the way LB methods simulate such interfaces. Our work resulted in significant algorithmic improvements thatalleviated these deficiencies. As a result, we were able to study indetail the behavior of the dynamic contact angle in flow throughcapillary tubes. Our simulations revealed that our LB methodreproduces the correct scaling of the dynamic contact angle withrespect to velocity, viscosity, and surface tension, withoutspecification of an artificial slip length. Further study allowed usto identify the microscopic origin of the dynamic contact angle in LBmethods. These results serve to delineate the range of applicabilityof multiphase LB methods to flows through complex geometries.

Author : Donald M. McEligot
Publisher :
Page : 5 pages
File Size : 11,34 MB
Release : 2004
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The primary purpose of this project is to use a combination of computer modeling and laboratory experiments to obtain a better understanding of multiphase flow in geometrically complex fracture apertures under a wide range of flow conditions. Because traditional grid-based numerical methods perform poorly for multiphase flows with complex dynamic interfaces due to problems such as artificial interface broadening and grid entanglement, the modeling component of the program relies heavily on particle based methods. In particle-based models, the fluid-fluid interfaces move as the particles representing the fluids move--there is no need for explicit interface tracking, and no artificial front broadening. In addition, particle-based methods rigorously conserve mass because each particle represents a fixed mass of fluid and the number of particles does not change unless particles leave or enter the computational domain (to represent fluid flow into or out of the system). Because different model approaches have characteristic strengths and weaknesses, three different classes of particle-based models (lattice Boltzmann, dissipative particle dynamics and smoothed particle hydrodynamics) are being employed in this program. This will allow us to achieve our objective of simulating multiphase/multicomponent flow under a wide range of flow conditions for a wide range of fluid properties.

Author :
Publisher :
Page : pages
File Size : 17,42 MB
Release : 2005
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ISBN :

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The primary purpose of this project is to use a combination of computer modeling and laboratory experiments to obtain a better understanding of multiphase flow in geometrically complex fracture apertures under a wide range of flow conditions. Because most traditional grid-based numeral methods perform poorly for multiphase flows with complex dynamic interfaces due to problems such as artificial interface broadening, grid entanglement, loss or gain of mass and their inability to handle fluid-fluid-solid contact line dynamics, the modeling component of the program relies primarily on particle based methods. In particle based models, the fluid-fluid interfaces move as the particles representing the fluids move--there is no need for explicit interface tracking, and no artificial front broadening. In addition, the fluid-fluid-solid contact line dynamics is also handled automatically by adjusting the interactions between the fluid particles and the particles used to represent solid boundaries. However, it can be difficult to select fluid-particle/solid-particle interactions that reproduce the wetting behaviors observed in experimental or natural systems. Because, different model approaches have characteristic strengths and weaknesses, three different classes of particle-based models (lattice Boltzmann, dissipative particle dynamics and smoothed particle hydrodynamics) are being employed in this program. This will allow us to achieve our objective of simulating multiphase flow under a wide range of flow conditions for a wide range of fluid properties.

Author : National Research Council
Publisher : National Academies Press
Page : 568 pages
File Size : 11,47 MB
Release : 1996-08-27
Category : Science
ISBN : 0309049962

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Scientific understanding of fluid flow in rock fracturesâ€"a process underlying contemporary earth science problems from the search for petroleum to the controversy over nuclear waste storageâ€"has grown significantly in the past 20 years. This volume presents a comprehensive report on the state of the field, with an interdisciplinary viewpoint, case studies of fracture sites, illustrations, conclusions, and research recommendations. The book addresses these questions: How can fractures that are significant hydraulic conductors be identified, located, and characterized? How do flow and transport occur in fracture systems? How can changes in fracture systems be predicted and controlled? Among other topics, the committee provides a geomechanical understanding of fracture formation, reviews methods for detecting subsurface fractures, and looks at the use of hydraulic and tracer tests to investigate fluid flow. The volume examines the state of conceptual and mathematical modeling, and it provides a useful framework for understanding the complexity of fracture changes that occur during fluid pumping and other engineering practices. With a practical and multidisciplinary outlook, this volume will be welcomed by geologists, petroleum geologists, geoengineers, geophysicists, hydrologists, researchers, educators and students in these fields, and public officials involved in geological projects.

Author : George Yadigaroglu
Publisher : Springer
Page : 221 pages
File Size : 26,58 MB
Release : 2017-08-19
Category : Technology & Engineering
ISBN : 3319587188

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This book is the maiden volume in a new series devoted to lectures delivered through the annual seminars “Short Courses on Multiphase Flow,” held primarily at ETH Zurich continuously since 1984. The Zurich short courses, presented by prominent specialists in the various topics covered, have attracted a very large number of participants. This series presents fully updated and when necessary re-grouped lectures in a number of topical volumes. The collection aims at giving a condensed, critical and up-to-date view of basic knowledge on multiphase flows in relation to systems and phenomena encountered in industrial applications. The present volume covers the background of Multiphase Flows (MPF) that introduces the reader to the particular nature and complexity of multiphase flows and to basic but critical aspects of MPFs including concepts and the definition of the quantities of interest, an introduction to modelling strategies for MPFs, flow regimes, flow regime maps and tr ansition criteria. It also deals with the ubiquitous needs of the multiphase-flow modeller, namely pressure drop and phase distribution, i.e., the void fraction and the topology of the phases that determines the flow regimes.

Author : S. Hernández
Publisher : WIT Press
Page : 136 pages
File Size : 23,13 MB
Release : 2020-06-03
Category : Science
ISBN : 1784664170

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The research included in this volume focuses on using synergies between experimental and computational techniques to gain a better understanding of all classes of multiphase and complex flow. The included papers illustrate the close interaction between numerical modellers and researchers working to gradually resolve the many outstanding issues in our understanding of multiphase flow. Recently multiphase fluid dynamics have generated a great deal of attention, leading to many notable advances in experimental, analytical and numerical studies. Progress in numerical methods has permitted the solution of many practical problems, helping to improve our understanding of the physics involved. Multiphase flows are found in all areas of technology and the range of related problems of interest is vast, including astrophysics, biology, geophysics, atmospheric process, and many areas of engineering.

Author : Efstathios Michaelides
Publisher : CRC Press
Page : 1421 pages
File Size : 18,41 MB
Release : 2016-10-26
Category : Science
ISBN : 1498701019

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The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.

Author : Christopher E. Brennen
Publisher : Cambridge University Press
Page : 376 pages
File Size : 49,33 MB
Release : 2005-04-18
Category : Technology & Engineering
ISBN : 1107717671

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This book is targeted to graduate students and researchers at the cutting edge of investigations into the fundamental nature of multiphase flows. It is intended as a reference book for the basic methods used in the treatment of multiphase flows. The subject of multiphase flows encompasses a vast field, a host of different technological contexts, a wide spectrum of different scales, a broad range of engineering disciplines, and a multitude of different analytical approaches. The aim of Fundamentals of Multiphase Flow is to bring much of this fundamental understanding together into one book, presenting a unifying approach to the fundamental ideas of multiphase flows. The book summarizes those fundamental concepts with relevance to a broad spectrum of multiphase flows. It does not pretend to present a comprehensive review of the details of any one multiphase flow or technological context; references to such reviews are included where appropriate.