Download or read book Flow and Transport of Colloidal Suspensions in Porous Media written by Frank Wirner and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book The Flow of Colloidal Suspensions Through Porous Media written by Robert John Hunter and published by . This book was released on 1962 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Flow of Colloidal Suspensions Through Porous Media written by Robert Bruce Curry and published by . This book was released on 1960 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation of the Flow of Colloidal Suspensions Through Porous Media written by Robert Bruce Curry and published by . This book was released on 1960 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Colloidal Suspension Hydrodynamics and Transport Processes in Microcapillary and Porous Media Flows Studied Using Dynamic Nuclear Magnetic Resonance written by Einar Orn Fridjonsson and published by . This book was released on 2010 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research presented in this dissertation uses Magnetic Resonance Microscopy (MRM) to investigate complex fluid dynamics systems. The systems investigated are colloidal transport in a microcapillary, bifurcation and porous medium, reactive transport in porous medium, transport through beta-lactoglobulin gels and the effect of peptide surfactants on droplet deformation in a Taylor-Couette device. Complex transport phenomena underlies many applications in engineering and thorough understanding of convective and diffusive motion in multiphase systems is important. MRM allows for the investigation of multi-phase transport phenomena noninvasively and can be used to investigate different moments of motion by sequence of the application of magnetic field gradients. The measurement of coherent and incoherent motion separately and the simultaneous measurement of multiple phases (colloids or suspending fluid) is possible. The colloidal flow studies show the effects shear induced migration, deposition, incoherent and coherent motion have on the macro- and microscopic structure of the fluids. Results show the direct effect increased shear has on the onset of secondary and chaotic fluid motion due to microscopic particle-particle and macroscopic fluid-structure interactions indicating the presence of shear thresholds. Reactive transport in porous media is important for understanding the spread of contaminants in the Earth's subsurface. The effect of calcium carbonate precipitation in a model porous medium due to Sporosarcina pasturii growth on the hydrodynamics was measured using MRM. These measurements show an increase in mechanical mixing causing a more rapid asymptote to Gaussian dynamics than for the same system without precipitation. The transport measurements of water with and without NaCl flowing through a homogeneous (pH 7.0) and heterogeneous (pH 5.2) beta-lactoglobulin gels quantifies the hydrodynamic dispersion in the gels and provided direct information on the gel structure noninvasively. Droplet deformation of (36/64)%wt toluene/chloroform droplets in a continuous phase of glycerol inside a Taylor-Couette device with and without surfactants (2%wt Tween60, AM1 and AFD4 peptide surfactants) is measured using a rapid MRM sequence (ROTACOR) which compensates for system rotation. MRM measurements show a restriction to droplet deformation due to the presence of the peptide surfactants.

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.

Download or read book Modelling of Pollutants in Complex Environmental Systems written by Grady Hanrahan and published by ILM Publications. This book was released on 2010 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental modelling has enjoyed a long tradition, but there is a defined need to continually address both the power and the limitations of such models, as well as their quantitative assessment. This book showcases modern environmental modelling methods, the basic theory behind them and their incorporation into complex environmental investigations. It highlights advanced computing technologies and how they have led to unprecedented and adaptive modelling, simulation and decision-support tools to study complex environmental systems, and how they can be applied to current environmental concerns. This volume is essential reading for researchers in academia, industry and government-related bodies who have a vested interest in all aspects of environmental modelling. Features include: A range of modern environmental modelling techniques are described by experts from around the world, including the USA, Canada, Australia, Europe and Thailand; many examples from air, water, soil/sediment and biological matrices are covered in detail throughout the book; key chapters are included on modelling uncertainty and sensitivity analysis; and, a selection of figures are provided in full colour to enable greater comprehension of the topics discussed.

Download or read book Colloid Transport in Porous Media written by Jennifer Smith and published by . This book was released on 2006 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Colloid Suspension Stability and Transport Through Unsaturated Porous Media written by Maureen A. McGraw and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Colloidal Suspension Flow and Transport Behavior in Small Channels by Magnetic Resonance Microscopy written by Jennifer Ruth Brown and published by . This book was released on 2007 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research presented addresses colloidal transport issues in small channel systems using Magnetic Resonance Microscopy techniques. In transport phenomena, the interaction between convection or deterministic motions and diffusion or random motions is important in many engineering and natural applications, especially relating to multiphase flows. Magnetic Resonance methods have the ability to separate coherent from incoherent motion, as well as measure spatially resolved velocity, probability distributions of displacement, and microstructure on the pore scale, even within a multiphase colloidal system. A dilute (f

Download or read book Colloidal Transport in Porous Media Modeling and Analysis written by Nadja Ray and published by . This book was released on 2013-06-28 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flow and Transport in Fractured Porous Media written by Peter Dietrich and published by Springer Science & Business Media. This book was released on 2005-12-12 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the characterization of flow and transport in porous fractured media from experimental and modeling perspectives. It provides a comprehensive presentation of investigations performed and analyzed on different scales.

Download or read book Flow induced Retention of Stable Colloidal Particles During Low Reynolds Number Flow of Dilute Suspensions Through Porous Media written by Venkatachalam Ramachandran and published by . This book was released on 1997 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Colloidal Transport in Porous Media written by Fritz H. Frimmel and published by Springer Verlag. This book was released on 2007-05-29 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloids are known to be the often neglected phase for the transport of pollutants in aquatic ecosystems. This book covers the basics of abiotic colloid characterization, of biocolloids and biofilms, the resulting transport phenomena and their engineering aspects. The contributors are leading specialists devoted to colloidal sciences. The discussion reflects their broad scope of viewpoint and depth of expertise. Coverage includes theoretical considerations, results from model experiments, and field studies.