Characterizing And Upscaling Transport Mixing And Reactions In Porous Media

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Characterizing and Upscaling Transport, Mixing and Reactions in Porous Media

Author : David Lee Hochstetler
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (848 download)

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Book Synopsis Characterizing and Upscaling Transport, Mixing and Reactions in Porous Media by : David Lee Hochstetler

Download or read book Characterizing and Upscaling Transport, Mixing and Reactions in Porous Media written by David Lee Hochstetler and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive transport in porous media is critical to many subsurface environmental issues including the fate and transport of contaminants, nuclear waste disposal, and carbon dioxide sequestration. Often, dilution and mixing are the controlling factors in each of these processes, such as the overlapping of plumes containing different reactants that is necessary for (bio)degradation of a groundwater contaminant. Thus, improved quantification of mixing, including upscaling relationships, parameterizations, and metrics for dilution and reactive mixing, are necessary for enhanced understanding, predictive modeling, and management of resources. There is a crucial need to improve the upscaling of parameters from the pore-scale to the Darcy and field scale, as well as improve our understanding of the phenomena that manifest at the macroscale as a result of the interaction of coupled physical and (bio)chemical processes at the pore scale. In this dissertation, pore-scale numerical models are used in combination with continuum models and lab (bench) scale experiments in order to study the coupled processes of flow, mixing, and reactions in three different studies. Also, a theoretical derivation is provided for the transport of the entropy of a reactive species, and several applications are used to illustrate its potential as a metric for reactive mixing and dilution. In the first study, pore-scale models are used to explore the unresolved question of the impact of using effective versus intrinsic reaction rate constants for predicting reactive transport in porous media. For a case of displacement and mixing of two solutions with irreversible bimolecular reactions, breakthrough curves from multiple locations are analyzed for conservative and reactive transport, as well as the segregation of reactant species along the cross-sections. For a range of Damköhler numbers (Da), effective reaction rate parameters are found and an empirical formula is developed to describe the relationship between the reaction effectiveness factor and $Da$. This helps describe the upscaled system behavior. The pore-scale results confirm the segregation concept advanced by Kapoor et al. (1997); however, for Da> 1, the effective rate constant is much less than the intrinsic rate constant, yet the relative difference in total mass transformation between the pore-scale simulation and what is predicted by the upscaled continuum model using the intrinsic rate constant is rather modest, of the order of about 10%. The explanation for this paradox is the early transition from a rate-limited to a mixing-limited regime, which results in a model that is relatively insensitive to the rate constant because mixing controls the availability of reactants. Thus, the reaction-rate parameter used in the model has limited influence on the rate of product computed. The second and third studies focus on transverse mixing, which often is critical for reactions to occur in porous media. In the second study, multitracer laboratory bench-scale experiments and pore-scale simulations are used to (i) determine a generalized parameterization of transverse hydrodynamic dispersion at the continuum Darcy scale, (ii) improve understanding of basic transport processes at the subcontinuum scale and how they manifest macroscopically, and (iii) quantify the importance of aqueous diffusion for transport of different solutes. In order to capture the observed results from the pore-scale and lab-scale, a nonlinear compound specific parameterization of transverse dispersion is necessary. The pore-scale simulations illustrate that the interplay between advective and diffusive mass transfer results in transverse concentration gradients leading to incomplete mixing in the pore channels. Ultimately, this affects local transverse mixing at the Darcy scale even at high flow velocities. In the third study, different pseudorandom pore-scale porous media are used for both conservative and reactive simulations, and the impact of the choice of transverse dispersion parameterization on predicting mixing-limited reactive transport with a continuum formulation is explored. Again, both pore-scale numerical simulations and flow-through laboratory experiments are used. The nonlinear parameterization of transverse dispersion consistently predicts both product mass flux and reactant plume extents across two orders of magnitude of mean flow velocities. In contrast, the classical linear parameterization of transverse dispersion, assuming a constant dispersivity as a property of the porous medium, could not consistently predict either indicator with great accuracy. Furthermore, the linear parameterization of transverse dispersion predicts an asymptotic (constant) plume length with increasing velocity while the nonlinear parameterization indicates that the plume length increases with the square root of the velocity. Both the pore-scale model simulations and the laboratory experiments of mixing-limited reactive transport show the latter relationship. A final issue this thesis addresses is the need for appropriate metrics that accurately quantify the interplay between mixing and reactive processes. The exponential of the Shannon entropy of the concentration probability distribution has been proposed and applied to quantify the dilution of conservative solutes either in a given volume or in a given water flux via the dilution index and the flux-related dilution index, respectively. In the final study, the transport equation for the entropy of a reactive solute is derived. Using a flux-related framework, it is shown that the degree of uniformity of the solute mass flux distribution for a reactive species and its rate of change are informative measures of physical and (bio)chemical processes and their complex interaction.

Upscaling Mixing-limited Chemical Reactions from Pore to Continuum Scale Using the Dispersive Lamella Concept

Author : Lazaro J. Perez Fonseca
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis Upscaling Mixing-limited Chemical Reactions from Pore to Continuum Scale Using the Dispersive Lamella Concept by : Lazaro J. Perez Fonseca

Download or read book Upscaling Mixing-limited Chemical Reactions from Pore to Continuum Scale Using the Dispersive Lamella Concept written by Lazaro J. Perez Fonseca and published by . This book was released on 2020 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive transport modeling is an important tool for the analysis of coupled physical, chemical, and biological processes in Earth systems. Observed reactive transport in heterogeneous porous media shows a different behavior than the established transport laws for homogeneous media. Natural aquifers exhibit physical and chemical heterogeneities at all scales, which leads to reaction and transport dynamics that cannot be explained by traditional reactive models based on the advection-dispersion-reaction equation (ADRE). In particular, the discrepancy is traced back to the nonuniform nature of flow velocity fields, complex spatial concentration distributions, and the degree of mixing between reactants. The role and contribution of these factors is key to provide accurate predictions of reactions. The complexity of the task lies in the enormous range of spatial and temporal scales that reactants find in natural porous media. Hence, the complete characterization of the fate of chemical reactions requires that models accounts for the basic mechanisms that govern the mixing and reaction dynamics. In this thesis, we present a novel methodology for the simulation of homogeneous chemical reactions. The proposed methodology is a random walk particle tracking approach (RWPT) coupled with reactions that simulates bimolecular chemical reactions, and is equivalent to the ADRE. Reactions among particles are determined by a reaction probability given in terms of the reaction rate coefficient, the total number of particles, and an interaction radius that describes a well-mixed support volume at which all particles have the same probability to react. The method is meshless and free of numerical dispersion. The RWPT approach is validated against analytical solutions for different flow scenarios under slow and fast reaction kinetics. We focus on the impact of the mixing degree between chemical species and its role in the global reaction behavior. We first consider a reactive displacement in a Poiseuille flow through a pore channel, this system allow us to quantify the impact of the interaction of interface deformation and diffusion on mixing and reactive transport. We observe overestimation of the global reaction efficiency by the use of the Taylor dispersion coefficient at preasymptotic times, when the system is characterized by incomplete mixing. Next, we observe features of incomplete mixing in a synthetic porous medium. Results show that macroscopic predictions using the hydrodynamic dispersion coefficient overestimates the amount of reaction. In addition, we analize the bimolecular reactive transport in a laboratory experiment, where we find that the amount of reaction is affected by the amount of mixing due to difusion, the amount of mixing due to spreading and the degree of heterogeneity of the flow field. The contributions of these factors induces that ADRE estimation of the total reaction product fails. In order to characterize incomplete mixing and provide an explicit relation between fluid deformation and its impact on the temporal evolution of the chemical reactivity, we develop the dispersive lamella approach based on the concept of effective dispersion which accurately predicts the full evolution of the product mass. Specifically, the approach captures the impact of interface deformation and diffusive coalescence. Using this methodology, we quantify the impact of flow heterogeneities on the amount of fluid mixing in a pore channel, where we observe three temporal regimes based on the production rate of the product mass. In addition, the dispersive lamella predictions capture the kinetics of the reaction in a synthetic porous medium. Results reveal that reaction behavior is controlled by the interface front between the two reactants. In the pore-scale experimental visualization, the dispersive lamella show that reaction is controlled by the deformed mixing interface at early times, and for fingering coalescence at late times.

Mixing and Reactions in Porous Media

Author : Pietro de Anna
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (819 download)

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Book Synopsis Mixing and Reactions in Porous Media by : Pietro de Anna

Download or read book Mixing and Reactions in Porous Media written by Pietro de Anna and published by . This book was released on 2012 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we use a stochastic approach to address the modeling of mixing dominated reactions in flows within heterogeneous porous media. When the transport is represented only by diffusion fluctuations in spatial concentration distribution lead to segregation of chemicals and thus to anomalous kinetics. We show that the transition from mean field to this anomalous kinetics is intimately linked to the evolution of the concentration PDF from a Gaussian to non-Gaussian shape. Considering also advective transport processes, we studied the incomplete mixing on effective kinetics at the front between two solutes, one displacing the other. While classical Fickian models predict a scaling for the mass production as t1/2, we show that the kinetics follow 2 non-Fickian regime. At early times the invading reactant is organized in fingers and the mass production scales as t2. For later times the mass production slows down, but it is still faster then the Fickian prediction t1/2, does not depends on diffusion and is totally controlled by advective spreading. We propose a new general framework for upscaling dispersion in porous media, relating the temporal evolution of spreading to the small scale velocity field properties. The resulting effective transport model is a correlated Continuous Time Random Walk, whose predictions are in good agreement with the pore scale simulations. We finally carried out a laboratory experiment where a quasi 2d system is studied through an Hele-Shaw cell in which two reactive chemicals are injected, one displacing the other. The anomalous kinetics of the observed reactive front results to be consistent with our theoretical predictions.

Multiscale High-order Methods for Reactive Transport in Porous Media

Author : Ricardo Hüntemann Deucher
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

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Book Synopsis Multiscale High-order Methods for Reactive Transport in Porous Media by : Ricardo Hüntemann Deucher

Download or read book Multiscale High-order Methods for Reactive Transport in Porous Media written by Ricardo Hüntemann Deucher and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subsurface reactive processes play an important role in addressing energy and climate challenges of the 21st century. Example applications are CO2 sequestration, enhanced oil recovery, and contaminant transport. Understanding the complex nonlinear interplay of flow, transport, and reactions at the multiple length scales that characterize subsurface systems is one of the main challenges for advancing the analysis of reactive transport. To address these challenges, this dissertation presents three main contributions towards accurate and efficient simulations of subsurface reactive transport. Chapter 2 develops a multiscale scheme for the sequential formulation of reactive transport involving two fluid phases. Instead of solving the transport problem on the global fine-scale model, the domain is decomposed into coarse gridblocks that are aggregates of fine gridblocks. The transport problem is defined and solved on each of the coarse blocks, and a prolongation operator that allows for accurate reconstruction of the fine-scale solution is defined. The prolongation operator is independent of the details of the chemical reactions involving the particular component being transported and does not interfere with the chemical module, providing flexibility of implementation and applicability to a wide range of conditions. The more confined concentration gradients obtained with high-order approximation of the numerical fluxes lead to a better performance of the scheme when compared to low-order fluxes. Test cases include applications to chains of homogeneous decay reactions, heterogeneous reactions with changes in rock properties, coupling with a chemical solver to model the calcium carbonate reactive system, variable time step sizes, and changes in operational conditions. A high-resolution adaptive implicit method for reactive transport is proposed in Chapter 3. The adaptive implicit method (AIM) reduces the computational cost related to simulations of field scale displacements in porous media. Standard AIM uses single-point upwind and a mixed implicit/explicit time discretization that overcomes the time step size limitations of purely explicit approaches. To reduce numerical diffusion and improve the accuracy of AIM, we introduce a scheme that in addition to blending implicit and explicit time discretizations, deliberately blends single-point upwind and a high-order flux-limited total variation diminishing approximation of the numerical fluxes. The proposed scheme does not interfere with the discretization of the implicit terms and the structure of the matrices that need to be solved is the same of standard AIM, making the scheme easy to apply in existing simulators. Numerical results indicate significant gains in accuracy at the additional expense of slightly more involved flux computations in the explicit regions, that represent a small fraction of the total CPU cost. In Chapter 4, a new upscaling procedure that provides 1D representations of 2D mixing-limited reactive transport systems is developed and applied. A key complication with upscaled models in this setting is that the procedure must differentiate between interface spreading, driven by the spatially variable velocity field, and mixing, through which components contact one another and react. Our model captures the enhanced mixing caused by spreading through use of a time-dependent effective dispersion term. The early-time behavior of this dispersion is driven by flow kinematics, while at late times it reaches a Taylor-dispersion-like limit. The early-time behavior is modeled using a very fast (purely advective) particle tracking procedure. The only unknown parameter in the model is the late-time asymptotic effective dispersion. This quantity is estimated using a fit involving a dimensionless grouping of system variables and a few reference results, or by calibrating with the corresponding conservative (non-reacting) case. Numerical results for bimolecular reaction systems are generated using a pseudo-spectral approach capable of resolving fronts at high Peclet numbers. Results are presented for three different types of 2D velocity fields over a wide range of parameters. The upscaled model is shown to provide highly accurate results for the conversion factor, along with reasonable approximations of the spatial distribution of reaction occurrence. The model is also shown to be valid to upscale mixing in non-reacting systems.

The Handbook of Groundwater Engineering

Author : John H. Cushman
Publisher : CRC Press
ISBN 13 : 1498703054
Total Pages : 1092 pages
Book Rating : 4.4/5 (987 download)

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Book Synopsis The Handbook of Groundwater Engineering by : John H. Cushman

Download or read book The Handbook of Groundwater Engineering written by John H. Cushman and published by CRC Press. This book was released on 2016-11-25 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition adds several new chapters and is thoroughly updated to include data on new topics such as hydraulic fracturing, CO2 sequestration, sustainable groundwater management, and more. Providing a complete treatment of the theory and practice of groundwater engineering, this new handbook also presents a current and detailed review of how to model the flow of water and the transport of contaminants both in the unsaturated and saturated zones, covers the protection of groundwater, and the remediation of contaminated groundwater.

Gas Transport in Porous Media

Author : Clifford K. Ho
Publisher : Springer Science & Business Media
ISBN 13 : 140203962X
Total Pages : 442 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Gas Transport in Porous Media by : Clifford K. Ho

Download or read book Gas Transport in Porous Media written by Clifford K. Ho and published by Springer Science & Business Media. This book was released on 2006-10-07 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: CLIFFORD K. HOAND STEPHEN W. WEBB Sandia National Laboratories, P. O. Box 5800, Albuquerque, NM 87185, USA Gas and vapor transport in porous media occur in a number of important applications includingdryingofindustrialandfoodproducts,oilandgasexploration,environm- tal remediation of contaminated sites, and carbon sequestration. Understanding the fundamental mechanisms and processes of gas and vapor transport in porous media allows models to be used to evaluate and optimize the performance and design of these systems. In this book, gas and vapor are distinguished by their available states at stan- ? dard temperature and pressure (20 C, 101 kPa). If the gas-phase constituent can also exist as a liquid phase at standard temperature and pressure (e. g. , water, ethanol, toluene, trichlorothylene), it is considered a vapor. If the gas-phase constituent is non-condensable at standard temperature and pressure (e. g. , oxygen, carbon di- ide, helium, hydrogen, propane), it is considered a gas. The distinction is important because different processes affect the transport and behavior of gases and vapors in porous media. For example, mechanisms specific to vapors include vapor-pressure lowering and enhanced vapor diffusion, which are caused by the presence of a g- phase constituent interacting with its liquid phase in an unsaturated porous media. In addition, the “heat-pipe” exploits isothermal latent heat exchange during evaporation and condensation to effectively transfer heat in designed and natural systems.

Pore Scale Geochemical Processes

Author : Carl Steefel
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 1501502077
Total Pages : 496 pages
Book Rating : 4.5/5 (15 download)

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Book Synopsis Pore Scale Geochemical Processes by : Carl Steefel

Download or read book Pore Scale Geochemical Processes written by Carl Steefel and published by Walter de Gruyter GmbH & Co KG. This book was released on 2015-09-25 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This RiMG (Reviews in Mineralogy & Geochemistry) volume includes contributions that review experimental, characterization, and modeling advances in our understanding of pore-scale geochemical processes. The volume had its origins in a special theme session at the 2015 Goldschmidt Conference in Prague. From a diversity of pore-scale topics that ranged from multi-scale characterization to modeling, this work summarizes the state-of-the-science in this subject. Topics include: modification of thermodynamics and kinetics in small pores. chemo-mechanical processes and how they affect porosity evolution in geological media. small angle neutron scattering (SANS) techniques. how isotopic gradients across fluid–mineral boundaries can develop and how these provide insight into pore-scale processes. Information on an important class of models referred to as "pore network" and much more. The material in this book is accessible for graduate students, researchers, and professionals in the earth, material, environmental, hydrological, and biological sciences. The pore scale is readily recognizable to geochemists, and yet in the past it has not received a great deal of attention as a distinct scale or environment that is associated with its own set of questions and challenges. Is the pore scale merely an environment in which smaller scale (molecular) processes aggregate, or are there emergent phenomena unique to this scale? Is it simply a finer-grained version of the "continuum" scale that is addressed in larger-scale models and interpretations? The scale is important because it accounts for the pore architecture within which such diverse processes as multi-mineral reaction networks, microbial community interaction, and transport play out, giving rise to new geochemical behavior that might not be understood or predicted by considering smaller or larger scales alone.

Non Fickian Solute Transport

Author : William Taylor
Publisher :
ISBN 13 : 9781632403872
Total Pages : 0 pages
Book Rating : 4.4/5 (38 download)

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Book Synopsis Non Fickian Solute Transport by : William Taylor

Download or read book Non Fickian Solute Transport written by William Taylor and published by . This book was released on 2015-02-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research-based book provides a mathematical approach based on stochastic calculus which describes state-of-the-art information regarding porous media science and engineering - prediction of dispersivity from covariance of hydraulic conductivity (velocity). The complication is of great significance for tracer examination, for improved recovery by injection of miscible gases, etc. The book elucidates a generalized mathematical model and efficient numerical methodologies that may greatly affect the stochastic porous media hydrodynamics. It begins with a descriptive basic analysis of the complication of scale dependence of the dispersion coefficient in porous media. Furthermore, relevant topics of stochastic calculus which would be helpful in modeling are discussed subsequently. An in-depth elaborative discussion regarding the development of a generalized stochastic solute transport model for any provided velocity covariance without conferring to fickian expectations from laboratory scale to field scale is also illustrated in this book. The mathematical approaches described in this book will serve as useful solutions for several other complications associated with chemical dispersion in porous media.

Non-local Models for Upscaling of Reaction and Transport Processes in Porous Media

Author : Persefoni E. Kechagia
Publisher :
ISBN 13 :
Total Pages : 378 pages
Book Rating : 4.:/5 (518 download)

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Book Synopsis Non-local Models for Upscaling of Reaction and Transport Processes in Porous Media by : Persefoni E. Kechagia

Download or read book Non-local Models for Upscaling of Reaction and Transport Processes in Porous Media written by Persefoni E. Kechagia and published by . This book was released on 2001 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Reactive Transport in Porous Media

Author : Peter C. Lichtner
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 1501509799
Total Pages : 452 pages
Book Rating : 4.5/5 (15 download)

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Book Synopsis Reactive Transport in Porous Media by : Peter C. Lichtner

Download or read book Reactive Transport in Porous Media written by Peter C. Lichtner and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 34 of Reviews in Mineralogy focuses on methods to describe the extent and consequences of reactive flow and transport in natural subsurface systems. Since the field of reactive transport within the Earth Sciences is a highly multidisciplinary area of research, including geochemistry, geology, physics, chemistry, hydrology, and engineering, this book is an attempt to some extent bridge the gap between these different disciplines. This volume contains the contributions presented at a short course held in Golden, Colorado, October 25-27, 1996 in conjunction with the Mineralogical Society of America's (MSA) Annual Meeting with the Geological Society of America in Denver, Colorado.

The Kinematics of Mixing

Author : J. M. Ottino
Publisher : Cambridge University Press
ISBN 13 : 9780521368780
Total Pages : 390 pages
Book Rating : 4.3/5 (687 download)

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Book Synopsis The Kinematics of Mixing by : J. M. Ottino

Download or read book The Kinematics of Mixing written by J. M. Ottino and published by Cambridge University Press. This book was released on 1989 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: In spite of its universality, mixing is poorly understood and generally speaking, mixing problems are attacked on a case-by-case basis. This is the first book to present a unified treatment of the mixing of fluids from a kinematical viewpoint. The author's aim is to provide a conceptually clear basis from which to launch analysis and to facilitate an understanding of the numerous mixing problems encountered in nature and technology. After presenting the necessary background in kinematics and fluid dynamics, Professor Ottino considers various examples of dealing with necessary background in dynamical systems and chaos. The book assumes little previous knowledge of fluid dynamics and dynamical systems and can be used as a textbook by final-year undergraduates, graduate students and researchers in applied mathematics, engineering science, geophysics and physics who have an interest in fluid dynamics, continuum mechanics and dynamical systems. It is profusely illustrated in colour, with many line diagrams and half-tones. Systems which illustrate the most important concepts, many exercises and examples are included.

Upscaling Reactive Transport in Porous Media

Author : Peter Michael Oates
Publisher :
ISBN 13 :
Total Pages : 482 pages
Book Rating : 4.:/5 (173 download)

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Book Synopsis Upscaling Reactive Transport in Porous Media by : Peter Michael Oates

Download or read book Upscaling Reactive Transport in Porous Media written by Peter Michael Oates and published by . This book was released on 2007 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Finally, manipulating the flow field to be perpendicular to its original direction would increase the rate of reactive mixing by an order of magnitude. Thus generating a transient flow field would be a practical way to accelerate natural attenuation and bioremediation.

Mathematical and Numerical Modeling in Porous Media

Author : Martin A. Diaz Viera
Publisher : CRC Press
ISBN 13 : 0203113888
Total Pages : 370 pages
Book Rating : 4.2/5 (31 download)

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Book Synopsis Mathematical and Numerical Modeling in Porous Media by : Martin A. Diaz Viera

Download or read book Mathematical and Numerical Modeling in Porous Media written by Martin A. Diaz Viera and published by CRC Press. This book was released on 2012-07-24 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porous media are broadly found in nature and their study is of high relevance in our present lives. In geosciences porous media research is fundamental in applications to aquifers, mineral mines, contaminant transport, soil remediation, waste storage, oil recovery and geothermal energy deposits. Despite their importance, there is as yet no complete

Computational Methods for Flow and Transport in Porous Media

Author : J.M. Crolet
Publisher : Springer
ISBN 13 : 9789048154401
Total Pages : 0 pages
Book Rating : 4.1/5 (544 download)

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Book Synopsis Computational Methods for Flow and Transport in Porous Media by : J.M. Crolet

Download or read book Computational Methods for Flow and Transport in Porous Media written by J.M. Crolet and published by Springer. This book was released on 2010-12-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first Symposium on Recent Advances in Problems of Flow and Transport in Porous Media was held in Marrakech in June '96 and has provided a focus for the utilization of computer methods for solving the many complex problems encountered in the field of solute transport in porous media. This symposium has been successful in bringing together scientists, physicists, hydrogeologists, researchers in soil and fluid mechanics and engineers involved in this multidisciplinary subject. It is clear that the utilization of computer-based models in this domain is still rapidly expanding and that new and novel solutions are being developed. The contributed papers which form this book reflect the recent advances, in particular with respect to new methods, inverse problems, reactive transport, unsaturated media and upscaling. These have been subdivided into the following sections: I. Numerical methods II. Mass transport and heat transfer III. Comparison with experimentation and simulation of real cases This book contains reviewed articles of the top presentations held during the International Symposium on Computer Methods in Porous Media Engineering which took place in Giens (France) in October 1998. All of the presentations and the optimism shown during the meeting provided further evidence that computer modeling is making remarkable progress and is indeed becoming an essential toolkit in the field of porous media and solute transport. I believe that the content of this book provides evidence of this and furthermore gives a comprehensive review of the theoretical developments and applications.

Radionuclide Behaviour in the Natural Environment

Author : Christophe Poinssot
Publisher : Elsevier
ISBN 13 : 0857097199
Total Pages : 737 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Radionuclide Behaviour in the Natural Environment by : Christophe Poinssot

Download or read book Radionuclide Behaviour in the Natural Environment written by Christophe Poinssot and published by Elsevier. This book was released on 2012-09-20 with total page 737 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding radionuclide behaviour in the natural environment is essential to the sustainable development of the nuclear industry and key to assessing potential environmental risks reliably. Minimising those risks is essential to enhancing public confidence in nuclear technology. Scientific knowledge in this field has developed greatly over the last decade.Radionuclide behaviour in the natural environment provides a comprehensive overview of the key processes and parameters affecting radionuclide mobility and migration. After an introductory chapter, part one explores radionuclide chemistry in the natural environment, including aquatic chemistry and the impact of natural organic matter and microorganisms. Part two discusses the migration and radioecological behavior of radionuclides. Topics include hydrogeology, sorption and colloidal reactions as well as in-situ investigations. Principles of modelling coupled geochemical, transport and radioecological properties are also discussed. Part three covers application issues: assessment of radionuclide behaviour in contaminated sites, taking Chernobyl as an example, estimation of radiological exposure to the population, performance assessment considerations related to deep geological repositories, and remediation concepts for contaminated sites. With its distinguished editors and international team of expert contributors, Radionuclide behaviour in the natural environment is an essential tool for all those interested or involved in nuclear energy, from researchers, designers and industrial operators to environmental scientists. It also provides a comprehensive guide for academics of all levels in this field. Provides a comprehensive overview of the key processes and parameters affecting radionuclide mobility and migration Explores radionuclide chemistry in the natural environment Discusses the migration and radioecological behaviour of radionuclides

Geological Storage of CO2 in Deep Saline Formations

Author : Auli Niemi
Publisher : Springer
ISBN 13 : 9402409963
Total Pages : 567 pages
Book Rating : 4.4/5 (24 download)

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Book Synopsis Geological Storage of CO2 in Deep Saline Formations by : Auli Niemi

Download or read book Geological Storage of CO2 in Deep Saline Formations written by Auli Niemi and published by Springer. This book was released on 2017-02-24 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers readers a comprehensive overview, and an in-depth understanding, of suitable methods for quantifying and characterizing saline aquifers for the geological storage of CO2. It begins with a general overview of the methodology and the processes that take place when CO2 is injected and stored in deep saline-water-containing formations. It subsequently presents mathematical and numerical models used for predicting the consequences of CO2 injection. This book provides descriptions of relevant experimental methods, from laboratory experiments to field scale site characterization and techniques for monitoring spreading of the injected CO2 within the formation. Experiences from a number of important field injection projects are reviewed, as are those from CO2 natural analog sites. Lastly, the book presents relevant risk management methods. Geological storage of CO2 is widely considered to be a key technology capable of substantially reducing the amount of CO2 released into the atmosphere, thereby reducing the negative impacts of such releases on the global climate. Around the world, projects are already in full swing, while others are now being initiated and executed to demonstrate the technology. Deep saline formations are the geological formations considered to hold the highest storage potential, due to their abundance worldwide. To date, however, these formations have been relatively poorly characterized, due to their low economic value. Accordingly, the processes involved in injecting and storing CO2 in such formations still need to be better quantified and methods for characterizing, modeling and monitoring this type of CO2 storage in such formations must be rapidly developed and refined.

Stochastic Subsurface Hydrology

Author : L. W. Gelhar
Publisher : Prentice Hall
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Stochastic Subsurface Hydrology by : L. W. Gelhar

Download or read book Stochastic Subsurface Hydrology written by L. W. Gelhar and published by Prentice Hall. This book was released on 1993 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume describes new stochastic subsurface hydrology techniques and results and examines the basic stochastic methods used to treat flow and contaminant transport in naturally heterogeneous permeable earth materials.