Computational Fluid Flow And Transport Of Colloidal Particles In Soil Pores

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Computational Fluid Flow and Transport of Colloidal Particles in Soil Pores

Author : Mehmet Ekrem Cakmak
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (854 download)

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Book Synopsis Computational Fluid Flow and Transport of Colloidal Particles in Soil Pores by : Mehmet Ekrem Cakmak

Download or read book Computational Fluid Flow and Transport of Colloidal Particles in Soil Pores written by Mehmet Ekrem Cakmak and published by . This book was released on 2011 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transport of colloidal size particulate matter is of special interest of environmental studies because colloids and adsorbed chemicals can be transported over long distances. Colloid facilitated transport can pose potentially high risk for pollution of ground water. Visualizations of colloid transport using bright field and confocal microscopes have discovered interesting phenomena such colloids moving in circles that cannot be described by the traditional Darcy scale models. That is why computational pore scale models are needed to better understand colloid transport and fate in porous media. Transport and fate of colloids depend largely on flow field in the pores and it is, therefore, important to simulate the flow field while taking grain surface properties into account. The aim of this dissertation is hence to determine the flow fields in realistic pores by solving the incompressible Navier-Stokes equation with a powerful commercial available finite element program COMSOL Multiphysics. The dissertation has five chapters. In the first chapter a short introduction is given. In the second chapter the COMSOL Multiphysics program is tested by revisiting the classical colloid filtration theory on colloid retention on a spherical sand grain. Retention of colloids on grains simulated with COMSOL is found to be similar to semi-analytical solutions previously published. Subsequently colloid retention on an air bubble is simulated and greater colloid retention is calculated than on a soil grain due to the slip boundary condition at the Air-Water interface which creates higher velocities and more fluid flow around air bubble resulting in greater amounts of colloids that can diffuse to the interface. In the third chapter the effect of surface roughness on hydrodynamics of colloid transport in a saturated porous media is investigated by simulating the flow fields around perfectly smooth, smoothed, and naturally rough sand grains. The results show that micron scale surface asperities of rough grains create greater vorticity and more stagnant flow regions compared to smooth grains likely resulting in greater colloid retention for the rough grains. In the fourth chapter the dependence of dynamic contact angle between the interface of two immiscible fluids and solid surface on the interface velocity is simulated in an empty capillary channel to provide a new understanding on the formation of unstable wetting fronts in coarse or water repellent soils. The results show an increase in contact angle when the velocity of the front increases, which is consistent with experimental studies in the literature. In the fifth chapter the problems encountered during the research and future directions are briefly explained.

Colloidal Particle Transport in Porous Media

Author : Randall Storm
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Colloidal Particle Transport in Porous Media by : Randall Storm

Download or read book Colloidal Particle Transport in Porous Media written by Randall Storm and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloidal particle transport in porous media is observed in several natural and engineered systems and has relevant applications such as enhanced oil recovery operations, targeted drug delivery treatment, and groundwater filtration processes within soil. This thesis presents a pore-scale numerical study of particle transport through a porous bed of fixed spheres arranged in a body-centered cubic (BCC) structure. The fluid flow field through the porous bed was calculated using a combined immersed boundary-lattice Boltzmann method. Individual particle trajectories were determined using the soft-sphere discrete-element method. The effects of particle size, fluid flow rate, and adhesion strength were investigated to illustrate the primary mechanisms influencing particle migration. The BCC pore structure created paths where the fluid flowed preferentially, resembling sinusoidal corrugated channels. The fluid straining field through these channels caused inertial drift of the particles towards the channel centers via a phenomenon related to oscillatory clustering. A measure was introduced to quantify particle drift into these channels over time and was shown to compare well with theoretical models for oscillatory clustering with non-adhesive particles. In the absence of adhesive forces, larger particles and higher flow rates resulted in greater particle clustering. Long-term collisions and particle capture by fixed-bed particles were observed to limit the drift measure. Computations performed with adhesive particles showed a significant reduction in the tendency for oscillatory clustering to occur due to suspended particles being more likely to remain attached to fixed bed particles along with longer collision durations.

Computational Methods for Flow and Transport in Porous Media

Author : J.M. Crolet
Publisher : Springer Science & Business Media
ISBN 13 : 9401711143
Total Pages : 372 pages
Book Rating : 4.4/5 (17 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 Science & Business Media. This book was released on 2013-03-14 with total page 372 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.

Straining of Small Particles in Porous Media

Author : Elena Rodríguez-Pin
Publisher :
ISBN 13 :
Total Pages : 428 pages
Book Rating : 4.:/5 (857 download)

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Book Synopsis Straining of Small Particles in Porous Media by : Elena Rodríguez-Pin

Download or read book Straining of Small Particles in Porous Media written by Elena Rodríguez-Pin and published by . This book was released on 2006 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling the retention of colloidal particles in soils is important to understanding water contamination from viruses, bacteria or contaminants adsorbed on colloids. Particles transported by fluid remain in the soil when they arrive at constrictions in the pore space too small to admit them. This phenomenon, called "straining", depends on the size and shape of constrictions in pore space. An analogy can be made between the retention of colloidal particles in soils and the trapping of fine particles within reservoir formations. Fine particles of clay or quartz are naturally present in the porous media. They may also enter the reservoir from external sources, like completion fluids. Once in the reservoir, fine particles can be mobilized by a chemical composition of the water in contact with the formation or simply by the shear forces during production. In their movement through the reservoir, fines can get trapped at small pore constrictions, reducing flow through the porous medium and causing a decline in reservoir productivity. The terms colloid and fine particle are interchangeable in this thesis. While theories of straining predict that dilute concentrations of particles smaller than the smallest nominal pore throats should migrate without being strained, experiments show that such particles are nevertheless retained in the porous medium. This thesis tests the hypothesis that particles are strained not just in throats between three grains, but also in gaps between pairs of grains. To test that hypothesis the number, width and distribution of such gaps has been quantified in model soils. The Finney packing (a widely used model for ideal soils) and ten new computer generated packings have been used for this purpose. All of them are dense random packings of mono-disperse spheres. The characterization of gaps in these ideal soils has confirmed that their occurrence in the packings is large enough to trap a considerable number of particles. The statistics of gap widths and point contacts in the Finney packing are comparable to the statistics from the computer generated packings, making the latter packings acceptable models of ideal soils. A range of gap widths of interest has been defined according to the size of the particles that show non-classical straining behavior in experiments. This range includes gap widths between 0.03 and 0.1 times the radius of the soil grains. The flow velocity through the gap, necessary to evaluate theories of particle straining, has been estimated assuming that the gap is a slit of width equal to the gap width. The range of capture specific to each gap width and particle size has been calculated in order to compute the volumetric flow appropriate to the particle being strained. This range of capture indicates the distance from the minimum constriction at which a particle approaching the gap can be strained. The calculated volumetric flows in gaps were between two and three orders of magnitude smaller than the flows in adjacent pore throats, obtained from a steady-state single–phase flow calculation. The distribution of gap widths and the volumetric flow through gaps in the Finney pack have been combined into a flow-rate-weighted distribution of gap widths. This distribution has been used in the theory of particle straining developed by Sharma and Yortsos (1987, a, c) in order to predict the probability of particle trapping in gaps. The theoretical rate constant for straining has been determined for several particle sizes and its scaling with particle size has been evaluated. This result has been compared to an empirical correlation reported by Bradford (2002). There was no concordance between the scaling correlation calculated in this work using a flow-weighted distribution of gap widths and the one reported in the literature. The data suggest a much weaker dependence of the straining rate on the volumetric flow through gaps than postulated in the theory. Another evaluation of the theory was made, this time assuming that straining rate is independent of flow rate through the gap. In this case, the predicted scaling exponent was smaller than the experimental value. The two evaluations of the straining theory yielded two relationships for straining rate constant that bound the observations. These evaluations represent two limiting cases when studying the dependence of straining with particle size. This suggests that the gap geometry obtained here, combined with a more refined evaluation of flow in the vicinity of gaps, could account for the experimental observations. evaluations represent two limiting cases when studying the dependence of straining with particle size. This suggests that the gap geometry obtained here, combined with a more refined evaluation of flow in the vicinity of gaps, could account for the experimental observations.

Lattice Boltzmann Method And Its Application In Engineering

Author : Zhaoli Guo
Publisher : World Scientific
ISBN 13 : 9814508314
Total Pages : 419 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Lattice Boltzmann Method And Its Application In Engineering by : Zhaoli Guo

Download or read book Lattice Boltzmann Method And Its Application In Engineering written by Zhaoli Guo and published by World Scientific. This book was released on 2013-03-25 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lattice Boltzmann method (LBM) is a relatively new simulation technique for the modeling of complex fluid systems and has attracted interest from researchers in computational physics. Unlike the traditional CFD methods, which solve the conservation equations of macroscopic properties (i.e., mass, momentum, and energy) numerically, LBM models the fluid consisting of fictive particles, and such particles perform consecutive propagation and collision processes over a discrete lattice mesh.This book will cover the fundamental and practical application of LBM. The first part of the book consists of three chapters starting form the theory of LBM, basic models, initial and boundary conditions, theoretical analysis, to improved models. The second part of the book consists of six chapters, address applications of LBM in various aspects of computational fluid dynamic engineering, covering areas, such as thermo-hydrodynamics, compressible flows, multicomponent/multiphase flows, microscale flows, flows in porous media, turbulent flows, and suspensions.With these coverage LBM, the book intended to promote its applications, instead of the traditional computational fluid dynamic method.

Characterization, Modeling, Monitoring, and Remediation of Fractured Rock

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309373727
Total Pages : 177 pages
Book Rating : 4.3/5 (93 download)

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Book Synopsis Characterization, Modeling, Monitoring, and Remediation of Fractured Rock by : National Academies of Sciences, Engineering, and Medicine

Download or read book Characterization, Modeling, Monitoring, and Remediation of Fractured Rock written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2021-01-29 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fractured rock is the host or foundation for innumerable engineered structures related to energy, water, waste, and transportation. Characterizing, modeling, and monitoring fractured rock sites is critical to the functioning of those infrastructure, as well as to optimizing resource recovery and contaminant management. Characterization, Modeling, Monitoring, and Remediation of Fractured Rock examines the state of practice and state of art in the characterization of fractured rock and the chemical and biological processes related to subsurface contaminant fate and transport. This report examines new developments, knowledge, and approaches to engineering at fractured rock sites since the publication of the 1996 National Research Council report Rock Fractures and Fluid Flow: Contemporary Understanding and Fluid Flow. Fundamental understanding of the physical nature of fractured rock has changed little since 1996, but many new characterization tools have been developed, and there is now greater appreciation for the importance of chemical and biological processes that can occur in the fractured rock environment. The findings of Characterization, Modeling, Monitoring, and Remediation of Fractured Rock can be applied to all types of engineered infrastructure, but especially to engineered repositories for buried or stored waste and to fractured rock sites that have been contaminated as a result of past disposal or other practices. The recommendations of this report are intended to help the practitioner, researcher, and decision maker take a more interdisciplinary approach to engineering in the fractured rock environment. This report describes how existing tools-some only recently developed-can be used to increase the accuracy and reliability of engineering design and management given the interacting forces of nature. With an interdisciplinary approach, it is possible to conceptualize and model the fractured rock environment with acceptable levels of uncertainty and reliability, and to design systems that maximize remediation and long-term performance. Better scientific understanding could inform regulations, policies, and implementation guidelines related to infrastructure development and operations. The recommendations for research and applications to enhance practice of this book make it a valuable resource for students and practitioners in this field.

Colloid and Surfactant Transport Modeling Through Agricultural Soil

Author : Sandip Raman Patil
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (859 download)

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Book Synopsis Colloid and Surfactant Transport Modeling Through Agricultural Soil by : Sandip Raman Patil

Download or read book Colloid and Surfactant Transport Modeling Through Agricultural Soil written by Sandip Raman Patil and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: National Water-Quality Assessment Program (NAWQA) was designed just after the U.S. Geological was established. The primary objective of the NAWQA was to understand the key processes controlling contaminant fate and transport into the Nation's water resources. In particular, wide use of pesticides and fertilizers in agricultural field can impact on the quality of surface and ground waters. Contaminants can be carried to the water bodies by several ways. In colloid-facilitated transport process colloidal particles serves as a transport media for the contaminants. Colloid release from the agricultural soil under unsaturated conditions is controlled by the hydrodynamic force, capillary force and electrostatic force that is determined by the solution chemistry in terms of solution ionic strength and pH. In this research, colloid release from the agricultural soil was investigated using an intact soil column collected from an agricultural site in Gadsden County of Florida. Colloid release was monitored and the colloid release curve was simulated using an implicit, finite-difference scheme to obtain the colloid release coefficient. It was found that the hydrodynamic force and electrostatic force overcame the capillary force under the experimental conditions of this research and consequently, colloids were released. For the colloid release, solution chemistry played a key role by controlling the colloid repulsive electrostatic force within the pore system. Colloid release exponentially decreased with the increase of solution ionic strength and increased with the increase of solution pH. Colloid release was finally found to be correlated to the colloid repulsive electrostatic force within the pore system, i.e., the greater the repulsive electrostatic force, more colloids were released. In situ colloid mobilization and transport has been studied under both saturated and unsaturated conditions. In saturated conditions, the controlling parameters are solution ionic strength and pH. Colloid mobilization and transport have been modeled by the advection-dispersion equation with a first-order colloid release. The inverse version of these models can provide a platform to estimate transport parameters based on transport observations. In this research, we taken the advantages of existing contaminants transport models by fully utilizing them to investigate colloid interactions with the surrounding environment and provide parameter constraints for colloid transport modeling applications under saturated conditions. In natural systems, colloids present a potential health risk due to their propensity to associate with contaminants or in the case of certain biological colloids, inherent pathogenic nature. Although colloidal interactions have been studied for many years and much has been learned about the physical and chemical processes that control colloid retention, there still remains significant uncertainty about the processes that govern colloid release. The aim of this study was to investigate the release of in situ colloids as a function of soil depth. Colloid release from intact agricultural soil columns with variable length was investigated. Colloid release curves were simulated using an implicit, finite-difference scheme and colloid release rate coefficient was found to be an exponential function of the soil depth. The simulated results demonstrated that transport parameters were not consistent along the depth of the soil profile. Wetting agents wet hydrophobic soil by lowering the cohesive and/or adhesive surface tension, which allows the water to spread out more evenly and allows for better penetration into the hydrophobic soils. While enhancing water penetration, wetting agent applications may bring adverse impact on the soil and groundwater at the same time. The residual organic phase in the soil pores poses a long-term source of groundwater contamination. After use, residual wetting agents and their degradation products are discharged to groundwater or directly to surface waters, then dispersed into different environmental compartments. In order to assess their environmental risks, we need to understand the distribution, behavior, fate and biological effects of these surfactants in the environment. This research was designed to investigate the application of nonionic wetting agents in agricultural soils. Performance of nonionic surfactants in intact soil columns collected from agricultural soils was explored and related to the soil and wetting agent properties. In addition, the impact of the organic concentration of wetting agent fate and transport was investigated. The transport of wetting agents in the agricultural soil columns was simulated using the proposed transport models and subsequently, the effect of organic compounds on wetting agent transport was quantified.

FLUID FLOW, SOLUTE MIXING AND PRECIPITATION IN POROUS MEDIA.

Author : George D. Redden
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis FLUID FLOW, SOLUTE MIXING AND PRECIPITATION IN POROUS MEDIA. by : George D. Redden

Download or read book FLUID FLOW, SOLUTE MIXING AND PRECIPITATION IN POROUS MEDIA. written by George D. Redden and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactions that lead to the formation of mineral precipitates, colloids or growth of biofilms in porous media often depend on the molecular-level diffusive mixing. For example, for the formation of mineral phases, exceeding the saturation index for a mineral is a minimum requirement for precipitation to proceed. Solute mixing frequently occurs at the interface between two solutions each containing one or more soluble reactants, particularly in engineered systems where contaminant degradation or modification or fluid flow are objectives. Although many of the fundamental component processes involved in the deposition or solubilization of solid phases are reasonably well understood, including precipitation equilibrium and kinetics, fluid flow and solute transport, the deposition of chemical precipitates, biofilms and colloidal particles are all coupled to flow, and the science of such coupled processes is not well developed. How such precipitates (and conversely, dissolution of solids) are distributed in the subsurface along flow paths with chemical gradients is a complex and challenging problem. This is especially true in systems that undergo rapid change where equilibrium conditions cannot be assumed, particularly in subsurface systems where reactants are introduced rapidly, compared to most natural flow conditions, and where mixing fronts are generated. Although the concept of dispersion in porous media is frequently used to approximate mixing at macroscopic scales, dispersion does not necessarily describe pore-level or molecular level mixing that must occur for chemical and biological reactions to be possible. An example of coupling between flow, mixing and mineral precipitation, with practical applications to controlling fluid flow or contaminant remediation in subsurface environments is shown in the mixing zone between parallel flowing solutions. Two- and three-dimensional experiments in packed-sand media were conducted where solutions containing calcium and carbonate ions came into contact along a parallel flow boundary and mixed by dispersion and diffusion. The result is the propagation of calcium carbonate precipitates along the solution-solution boundary in the direction of flow. As carbonate precipitates fill the pore space mixing of the two solutions is restricted and therefore precipitation, flow, and transport are coupled. The distribution of carbonate phases is a complex interaction involving precipitation and dissolution kinetics, which are functions of pore-scale saturation indices and solute ratios, heterogeneous vs. homogeneous nucleation and growth mechanisms and changes in porosity and flow. Experimental and modeling results illustrate challenges in understanding the macroscopic and microscopic phenomena that depend on solute mixing, the relevance of molecular and pore-scale processes to the macroscopic behavior, and potential impact on metal mobility in porous media. Mineral precipitation and changes in porosity are simulated at the pore-scale using the Smooth Particle Hydrodynamics method. Macroscopic simulations were performed using discretized, continuum-scale modeling with parameterization representing macroscopic media properties. One of the modeling goals is to use pore-scale simulations to provide the basis for parameterization of macroscopic (more practical) model predictions.

Transport and Retention of Colloidal Particles in Partially Saturated Pores

Author : Yuniati Zevi
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (472 download)

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Book Synopsis Transport and Retention of Colloidal Particles in Partially Saturated Pores by : Yuniati Zevi

Download or read book Transport and Retention of Colloidal Particles in Partially Saturated Pores written by Yuniati Zevi and published by . This book was released on 2008 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Transport Phenomena in Porous Media

Author : Jacob Bear
Publisher : Springer Science & Business Media
ISBN 13 : 9400936257
Total Pages : 1018 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis Advances in Transport Phenomena in Porous Media by : Jacob Bear

Download or read book Advances in Transport Phenomena in Porous Media written by Jacob Bear and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the lectures presented at the NATO ADVANCED STUDY INSTITUTE that took place at Newark, Delaware, U. S. A. , July 14-23, 1985. The objective of this meeting was to present and discuss selected topics associated with transport phenomena in porous media. By their very nature, porous media and phenomena of transport of extensive quantities that take place in them, are very complex. The solid matrix may be rigid, or deformable (elastically, or following some other constitutive relation), the void space may be occupied by one or more fluid phases. Each fluid phase may be composed of more than one component, with the various components capable of interacting among themselves and/or with the solid matrix. The transport process may be isothermal or non-isothermal, with or without phase changes. Porous medium domains in which extensive quantities, such as mass of a fluid phase, component of a fluid phase, or heat of the porous medium as a whole, are being transported occur in the practice in a variety of disciplines.

The Lattice Boltzmann Method

Author : Timm Krüger
Publisher : Springer
ISBN 13 : 3319446495
Total Pages : 705 pages
Book Rating : 4.3/5 (194 download)

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Book Synopsis The Lattice Boltzmann Method by : Timm Krüger

Download or read book The Lattice Boltzmann Method written by Timm Krüger and published by Springer. This book was released on 2016-11-07 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to the theory, practice, and implementation of the Lattice Boltzmann (LB) method, a powerful computational fluid dynamics method that is steadily gaining attention due to its simplicity, scalability, extensibility, and simple handling of complex geometries. The book contains chapters on the method's background, fundamental theory, advanced extensions, and implementation. To aid beginners, the most essential paragraphs in each chapter are highlighted, and the introductory chapters on various LB topics are front-loaded with special "in a nutshell" sections that condense the chapter's most important practical results. Together, these sections can be used to quickly get up and running with the method. Exercises are integrated throughout the text, and frequently asked questions about the method are dealt with in a special section at the beginning. In the book itself and through its web page, readers can find example codes showing how the LB method can be implemented efficiently on a variety of hardware platforms, including multi-core processors, clusters, and graphics processing units. Students and scientists learning and using the LB method will appreciate the wealth of clearly presented and structured information in this volume.

Small Scale Laboratory Studies of Flow and Transport Phenomena in Pores and Fractures: Phase 2. Technical Completion Report

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

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Book Synopsis Small Scale Laboratory Studies of Flow and Transport Phenomena in Pores and Fractures: Phase 2. Technical Completion Report by :

Download or read book Small Scale Laboratory Studies of Flow and Transport Phenomena in Pores and Fractures: Phase 2. Technical Completion Report written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pore level laboratory experiments using microscopy permit the in situ visualization of flow and transport phenomena, that can be recorded on film or videotape. One of the principal tools for visualization is the etched glass micromodel, which is composed of a transparent two dimensional network of three dimensional pores. The spatial scale of interest in these models extends from the individual pore, up to a network of pores, perhaps with small scale heterogeneities. Micromodels are best used to help validate concepts and assumptions, and to elucidate new, previously unrecognized phenomena for further study. They are not quantitative tools, but should be used in combination with quantitative tools such as column studies or mathematical models. There are three applications: multi-phase flow, colloid transport, and bacterial transport and colonization. Specifically the authors have examined behavior of relevance to liquid-liquid mass transfer (solubilization of capillary trapped organic liquids); liquid-gas mass transfer (in situ volatilization); mathematical models of multi-phase pressure-saturation relationships; colloid movement, attachment and detachment in the presence of fluid-fluid interfaces, clay interference with multi-phase flow; and heterogeneity effects on multi-phase flow and colloid movement.

Relaçam da sollenne entrada publica que nesta corte e cidade do Porto fez em o dias sinco de mayo de 1743 o... Senhor D. Fr. Joseph Maria da Fonseca e Evora, bispo da mesma cidade...

Download Relaçam da sollenne entrada publica que nesta corte e cidade do Porto fez em o dias sinco de mayo de 1743 o... Senhor D. Fr. Joseph Maria da Fonseca e Evora, bispo da mesma cidade... PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (469 download)

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Book Synopsis Relaçam da sollenne entrada publica que nesta corte e cidade do Porto fez em o dias sinco de mayo de 1743 o... Senhor D. Fr. Joseph Maria da Fonseca e Evora, bispo da mesma cidade... by :

Download or read book Relaçam da sollenne entrada publica que nesta corte e cidade do Porto fez em o dias sinco de mayo de 1743 o... Senhor D. Fr. Joseph Maria da Fonseca e Evora, bispo da mesma cidade... written by and published by . This book was released on 1743 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Colloidal Transport in Porous Media

Author : Fritz H. Frimmel
Publisher : Springer Science & Business Media
ISBN 13 : 3540713395
Total Pages : 294 pages
Book Rating : 4.5/5 (47 download)

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Book Synopsis Colloidal Transport in Porous Media by : Fritz H. Frimmel

Download or read book Colloidal Transport in Porous Media written by Fritz H. Frimmel and published by Springer Science & Business Media. This book was released on 2007-05-26 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the basics of abiotic colloid characterization, of biocolloids and biofilms, the resulting transport phenomena and their engineering aspects. The contributors comprise an international group of leading specialists devoted to colloidal sciences. The contributions include theoretical considerations, results from model experiments, and field studies. The information provided here will benefit students and scientists interested in the analytical, chemical, microbiological, geological and hydrological aspects of material transport in aquatic systems and soils.

Particle Straining in Vuggy Porous Media

Author : Hasan Javed Khan
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (129 download)

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Book Synopsis Particle Straining in Vuggy Porous Media by : Hasan Javed Khan

Download or read book Particle Straining in Vuggy Porous Media written by Hasan Javed Khan and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Formation damage is the loss of inherent permeability of porous media and is of vital importance in petroleum engineering. One important mechanism of formation damage is particulate straining, where suspended solid particles jam the flow pathways and reduce its flow capability. Most studies of particulate transport have been performed in porous media of uniform pore size, such as sandstones and sandpacks. Carbonates often contain large openings, called vugs, which can affect the flow and transport properties (particle straining) of the porous medium. In this study, particle straining experiments are performed on multiple configurations of synthetic vuggy media. A novel method is introduced to generate synthetic vuggy glass bead cores: glass beads, with dissolvable inclusions, are sintered in the presence of air in a muffle furnace and later dissolved with a core flood. Smaller-sized glass beads are injected at multiple flow rate and injection concentrations and changes in porosity, permeability, vug size, and particle effluent volume are monitored using continuous pressure measurements and computed tomography scanning. The results are combined with quasi-2D streamline simulations to understand the particle deposition patterns in these vuggy media. Furthermore, spontaneous imbibition experiments are conducted on multiple configurations of these synthetic vuggy media and capillary rise is measured. Rudimentary vug-pore flow models are generated, and solved for spontaneous imbibition using a computational fluid dynamics solver, to better explain the behavior observed in the experiments. The results can be summarized as follows: (i) particles penetrate and deposit at a deeper depth when a vug is present; (ii) the particles deposit on the vug-matrix boundary and result in a smaller and smoother vug; (iii) the maximum change in the vug is observed at the bottom of the vug; and (iv) more particle deposition occurs in the matrix around the vug. The high permeability vugs cause flow convergence, which increases the particle-particle and particle-matrix interaction, and results in an increased number of particles dropping out of the flow stream. Each vug has a sphere of influence within which it will affect the particle flow pathway; if the sphere of influence of two vugs overlap, the particle will be affected by both the vugs, with the dominance depending on the separation between the particle and the vug. The results suggest that for the vug conditions studied, the vugs in series focus the flow and increase the depth of particle deposition and the total volume of particles deposited in the core. The vugs in parallel acts independently as separate vugs, with their separation greater than their individual sphere of influence, and do not dictate the deposition of injected particles. In future, this study can be carried forward by conducting experiments inside a CT machine, to enable time-lapse particle deposition maps, on proxy vuggy media or real rocks. Coupled with real-time porosity, permeability, and possibly resistivity measurements, new near-wellbore interpretative models can be envisioned for improved formation evaluation of vuggy carbonates

Modeling Deposition Dynamics and Transport of Colloidal Particles in Heterogeneously-charged Porous Media

Author : Philip Randolph Johnson
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (345 download)

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Book Synopsis Modeling Deposition Dynamics and Transport of Colloidal Particles in Heterogeneously-charged Porous Media by : Philip Randolph Johnson

Download or read book Modeling Deposition Dynamics and Transport of Colloidal Particles in Heterogeneously-charged Porous Media written by Philip Randolph Johnson and published by . This book was released on 1995 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Introduction to Colloid and Surface Chemistry

Author : Duncan J. Shaw
Publisher :
ISBN 13 :
Total Pages : 254 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Introduction to Colloid and Surface Chemistry by : Duncan J. Shaw

Download or read book Introduction to Colloid and Surface Chemistry written by Duncan J. Shaw and published by . This book was released on 1970 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The colloidal state; Kinetic properties; Optical properties; Liquid-gas and liquid- liquid interfaces; The solid-gas interface; Charged interfaces; Colloid stability; Rheology; Emulsions and foams.