Modeling Deposition Dynamics and Transport of Colloidal Particles in Heterogeneously-charged Porous Media PDF Download
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Author: Philip Randolph Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 308
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Book Description
Author: Philip Randolph Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 308
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Book Description
Author: M. Elimelech
Publisher: Butterworth-Heinemann
ISBN: 1483161374
Category : Science
Languages : en
Pages : 458
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Book Description
Particle Deposition and Aggregation: Measurement, Modelling and Simulation describes how particle deposition and aggregation can be measured, modeled, and simulated in a systematic manner. It brings together the necessary disciplines of colloid and surface chemistry, hydrodynamics, experimental methods, and computational methods to present a unified approach to this problem. The book is divided into four parts. Part I presents the theoretical principles governing deposition and aggregation phenomena, including a discussion of the forces that exist between particles and the hydrodynamic factors that control the movement of the particles and suspending fluid. Part II introduces methods for modeling the processes, first at a simple level (e.g. single particle-surface, single particle-single particle interactions in model flow conditions) and then describes the simulation protocols and computation tools which may be employed to describe more complex (multiple-particle interaction) systems. Part III summarizes the experimental methods of quantifying aggregating and depositing systems and concludes with a comparison of experimental results with those predicted using simple theoretical predictions. Part IV is largely based on illustrative examples to demonstrate the application of simulation and modeling methods to particle filtration, aggregation, and transport processes. This book should be useful to graduates working in process and environmental engineering research or industrial development at a postgraduate level, and to scientists who wish to extend their knowledge into more realistic process conditions in which the fluid hydrodynamics and other complicating factors must be accommodated.
Author: Chun-Han Ko
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Book Description
Author:
Publisher:
ISBN:
Category : Colloids
Languages : en
Pages : 40
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Book Description
Author: Ann Mathew
Publisher:
ISBN:
Category :
Languages : en
Pages : 272
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Book Description
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 858
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Book Description
Author: Gaétan Gerber
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
From the separation of products on industrial filters to the propagation of pollutants in soils or the transmission of micro-organisms in biological tissues, the transport of particles through porous matrices is ubiquitous. Particle-matrix interactions involve crucial deposition mechanisms, often studied by numerical simulations, global measurements or reduced (1D or 2D) systems. By making adapted 3D porous media (transparent random packings of spheres), and taking advantage of original internal observations (MRI, confocal microscopy), we have been able to directly visualize and analyze the whole range of transport and deposition dynamics at the global and local scales. Varying in turns the particles size (tens of nanometers to tens of microns), long-range interactions (electrostatic or magnetic) and shape (from unique spheres to clusters), all deposition regimes are finally mapped according to three key parameters: particle confinement (particle/pore size ratio), particle-surface affinity, and inter-particle aggregation ability.Two examples highlight the diversity of these regimes. First, we show that non-colloidal particles of sufficient size tend to clog pores by accumulating in pore size clusters, which ultimately constitute regions avoided by the flow. A critical cluster concentration (percolation) corresponds to a system saturation, i.e. caking. Further insights on the impact of the particle shape on the clogging dynamics are also proposed. On another side, for non-clogging colloidal particles, we show that particle accumulation is a self-limited mechanism, towards a deposited fraction associated with a balance between the colloidal cohesive energy and the local flow (drag energy varying with evolving porosity).In the end, the classification of the main deposition regimes combined with simple predictive models allows an application of these results to a broad range of systems.
Author: Malay K. Das
Publisher: Springer
ISBN: 3319698664
Category : Technology & Engineering
Languages : en
Pages : 250
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Book Description
This book is an ensemble of six major chapters, an introduction, and a closure on modeling transport phenomena in porous media with applications. Two of the six chapters explain the underlying theories, whereas the rest focus on new applications. Porous media transport is essentially a multi-scale process. Accordingly, the related theory described in the second and third chapters covers both continuum‐ and meso‐scale phenomena. Examining the continuum formulation imparts rigor to the empirical porous media models, while the mesoscopic model focuses on the physical processes within the pores. Porous media models are discussed in the context of a few important engineering applications. These include biomedical problems, gas hydrate reservoirs, regenerators, and fuel cells. The discussion reveals the strengths and weaknesses of existing models as well as future research directions.
Author: Jacob H. Masliyah
Publisher: John Wiley & Sons
ISBN: 0471799734
Category : Science
Languages : en
Pages : 733
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Book Description
A new, definitive perspective of electrokinetic and colloid transport processes Responding to renewed interest in the subject of electrokinetics, Electrokinetic and Colloid Transport Phenomena is a timely overview of the latest research and applications in this field for both the beginner and the professional. An outgrowth of an earlier text (by coauthor Jacob Masliyah), this self-contained reference provides an up-to-date summary of the literature on electrokinetic and colloid transport phenomena as well as direct pedagogical insight into the development of the subject over the past several decades. A distinct departure from standard colloid science monographs, Electrokinetic and Colloid Transport Phenomena presents the most salient features of the theory in a simple and direct manner, allowing the book to serve as a stepping-stone for further learning and study. In addition, the book uniquely discusses numerical simulation of electrokinetic problems and demonstrates the use of commercial finite element software for solving these multiphysics problems. Among the topics covered are: * Mathematical preliminaries * Colloidal systems * Electrostatics and application of electrostatics * Electric double layer * Electroosmosis and streaming potential * Electrophoresis and sedimentation potential * London-Van der Waals forces and the DLVO theory * Coagulation and colloid deposition * Numerical simulation of electrokinetic phenomena * Applications of electrokinetic phenomena Because this thorough reference does not require advanced mathematical knowledge, it enables a graduate or a senior undergraduate student approaching the subject for the first time to easily interpret the theories. On the other hand, the application of relevant mathematical principles and the worked examples are extremely useful to established researchers and professionals involved in a wide range of areas, including electroosmosis, streaming potential, electrophoretic separations, industrial practices involving colloids and complex fluids, environmental remediation, suspensions, and microfluidic systems.
Author: Behnam Sadri
Publisher:
ISBN:
Category : Colloids
Languages : en
Pages : 89
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Book Description
Colloidal-collector interactions are of fundamental importance in separation and filtration technologies. Here, the effect of collector grains on the behavior of colloidal particles was studied in two different experimental systems, i.e., column studies with stationary collectors and batch mixing to study hetero aggregation. Polystyrene latex beads, 100 nm diameter, and soda lime glass beads, with two different diameters of 212-300 $\mu$m and 710-1180 $\mu$m, were employed as colloidal particles and collector grains, respectively. Column experiments were performed to understand fate of colloidal particles in the porous medium. There are three major phenomena that control colloidal transport in porous media: Deposition, aggregation, and straining. These three distinct types of particle dynamics in porous media were studied by adjusting physicochemical properties of colloidal suspension. Furthermore, the effect of washing the collector beads was studied. Batch experiments, in which known amount of collector grains are added to colloidal suspension with known concentration, are designed to investigate more collector-colloids interaction role in transport dynamics of colloidal particles. UV-Vis spectroscopy and dynamic light scattering techniques are employed to understand both deposition and aggregation of colloidal particles in the vicinity of collector grains. Results obtained by dynamic light scattering revealed that aggregation is the predominant factor in this colloidal system. The possible sources for this type of behavior are also tackled by undertaking controlled experiments. In the batch experiments, ions leaching from the surface of glass beads, effect of mixing, and glass beads presence are confirmed as the three major reasons behind the aggregation of colloidal particles.
