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 Hydrodynamics written by Theo G. M. Van de Ven and published by London [England] ; Toronto : Academic Press. This book was released on 1989 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic treatment of the flow behavior of colloidal dispersions that occur in a large number of industrial processes, such as transportation, stirring, and shaking. It also discusses the microrheology of dilute and concentrated dispersions. Colloidal Hydrodynamics is a useful reference for graduate students in chemistry and chemical engineering as well as researchers in the field.
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 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 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 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 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 Colloid Particle Transport in a Microcapillary NMR Study of Particle and Suspending Fluid Dynamics written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Supercritical Fluids Oscillatory Flow and Partially Saturated Porous Media by Magnetic Resonance Microscopy written by Erik Michael Rassi and published by . This book was released on 2011 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research presented in this dissertation used Magnetic Resonance (MR) techniques to study fluid dynamics in complex systems. The systems investigated were critical and supercritical fluids, partially saturated porous media, and oscillatory flow. Supercritical fluids (SCF) are useful solvents in green chemistry and oil recovery and are of great current interest in the context of carbon sequestration. Flow in partially saturated porous media and the resultant hydrodynamics are important in fields including but not limited to hydrology, chemical, medical, and the petroleum industry. Lastly, Pulsatile and oscillatory flows are prevalent in many biological, industrial, and natural systems. Displacement propagators were measured at various displacement observation times to quantify the time evolution of dynamics in critical and supercritical fluid flow. In capillary flow, the critical phase transition fluid C2F6 showed increased compressibility compared to the near critical gas and supercritical fluid. These flows exhibit large variations in buoyancy arising from large changes in density due to very small changes in temperature. Ensemble averaged MR measurements were taken to observe the effects on a bead pack partially saturated with air under flowing conditions of water. Air was injected into the bead pack as water flowed simultaneously through the sample. The initial partially saturated state was characterized with MR imaging density maps, free induction decay (FID) experiments, propagators, and velocity maps before the water flow rate was increased. After the maximum flow rate, the MR imaging density maps, FID experiments, propagators, and velocity maps were repeated and compared to the data taken before the maximum flow rate. The work performed here showed that a partially saturated single phase flow had global flow dynamics that returned to characteristic flow statistics once a steady state high flow rate was reached. A system was constructed to provide a controllable and predictable oscillatory flow in order to gain a better understanding of the impact of oscillatory flow on Newtonian and non-Newtonian fluids, specifically water, xanthan gum (XG), polyacrylamide (PAM) colloidal suspensions. The oscillatory flow system coupled with MR measured the velocity distributions and dynamics of the fluid undergoing oscillatory flow at specific points in the oscillation cycle.
Download or read book Hydrodynamics of Suspensions written by Marius Ungarish and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Attention is focused on a suspension of buoyant particles (or droplets) in acontinuous fluid. In the presence of a force field, gravitational or centrifugal, and exposed to ordinary boundary constraints, a variety of fascinating flows can be obtained. These motions are essential ingre- dients in the widely used separation technology, where im- provedand new designs may be beneficial, but they are also interesting from a broader, academic point of view. In these respects, the recent investigations on these flows patterns, their underlying mechanisms and mathematical modeling - have accrued to a significant, relevant body of knowledge. The main objective of this book is to summarize - in a systematic, coherent and consistent fashion - the theoretical up to date contributions which seem fundamental in understanding, simulation and development of the subject.
Download or read book Flow of Particles in Suspensions written by U. Schaflinger and published by Springer. This book was released on 2014-05-04 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a broad overview of the issues related to the flow of particles in suspensions. Chapters cover the newest research in advanced theoretical approaches and recent experimental techniques. Topics include macroscopic transport properties, the mechanics of capsules and cells, hydrodynamic diffusion and phase separation.
Download or read book Transport Properties in Concentrated Colloidal Suspensions written by Rolf Verberg and published by . This book was released on 1998 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamic Effects on Active Colloidal Suspensions written by Eloy Navarro Argemí and published by . This book was released on 2019 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this thesis is studying hydrodynamic effects on active colloidal suspensions. Hydrodynamic interaction is propagated through the fluid in which the colloids displace due to the flow they create during their motion. It can lead to the emergence of collective phenomena, such as the self-assembly of more complex structures. Hydrodynamic interactions are not the only present in the system, since other forces may be acting between colloids, or there can be external fields acting on them such as gravity. We present our study for two different systems: magnetic colloids and Janus particles. When applying a circular magnetic field, we can induce a rotation to a particle possessing a magnetic moment. Due to the coupling of the flow with the one created by surrounding particles and with system interfaces, a rotor will eventually self-propel. Two magnetic moments interact with each other through the magnetic dipole-dipole force, which tends to align them into arrays. We study how the balance between hydrodynamic, magnetic and gravitational forces determines the morphology of the structures magnetic colloids can form. Janus particles have two faces with different chemical properties, thus the interaction between them depends on their relative orientation. We study the morphology and order of the structures that can emerge for these particles as a function of the intensity, sign and reach of the interaction between them, as well as the type of flow they create when self-propelling. Methodologically, we have combined the use of far-field theory to draw analytical expressions that have given us qualitative insight on the results we could expect with high-performance computing simulations which have allowed us to extend our study to bigger systems.
Download or read book Transverse Dispersion in Liquid Flow Through Porous Media written by Eugene Sidney Simpson and published by . This book was released on 1962 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
