Author: Marguerite Graveleau
Publisher:
ISBN:
Category :
Languages : en
Pages : 212

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
Sites contaminated with dense nonaqueous phase liquids (DNAPLs) such as chlorinated solvents are, typically, exceptionally difficult to characterize because the unstable nature of the front results in complex distributions that are erratic, highly fingered and sensitive to small-scale heterogeneities. However, DNAPL source zone characterization is important for risk assessments, feasibility studies and identification of appropriate remediation technologies at DNAPL-contaminated sites. The extent and configuration of the source zone is also important input to multiphase mass transfer models. Pore scale models capture the essential physics of the multiphase migration process without the need to solve the large systems of equations inherent in continuum modeling. This research project developed a modified diffusion limited aggregation model that can be used to predict source zone geometry when viscous effects are important. A unique relationship between the model input parameter, the sticking probability and the essential properties governing the DNAPL-water front displacement was developed. The model was compared with both homogeneous and heterogeneous laboratory experiments. Model and laboratory results were found to compare well.

Author: Rudolf Josef Held
Publisher:
ISBN:
Category :
Languages : en
Pages : 396

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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: Weishu Zhao
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: James E. McClure
Publisher: Frontiers Media SA
ISBN: 2832507476
Category : Science
Languages : en
Pages : 164

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Book Description

Author: David L. Parkhurst
Publisher: Createspace Independent Publishing Platform
ISBN: 9781500563103
Category : Technology & Engineering
Languages : en
Pages : 518

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Book Description
PHREEQC version 3 is a computer program written in the C and C++ programming languages that is designed to perform a wide variety of aqueous geochemical calculations. PHREEQC implements several types of aqueous models: two ion-association aqueous models (the Lawrence Livermore National Laboratory model and WATEQ4F), a Pitzer specific-ion-interaction aqueous model, and the SIT (Specific ion Interaction Theory) aqueous model. Using any of these aqueous models, PHREEQC has capabilities for (1) speciation and saturation-index calculations; (2) batch-reaction and one-dimensional (1D) transport calculations with reversible and irreversible reactions, which include aqueous, mineral, gas, solid-solution, surface-complexation, and ion-exchange equilibria, and specified mole transfers of reactants, kinetically controlled reactions, mixing of solutions, and pressure and temperature changes; and (3) inverse modeling, which finds sets of mineral and gas mole transfers that account for differences in composition between waters within specified compositional uncertainty limits.

Author: Kambiz Vafai
Publisher: CRC Press
ISBN: 0824741501
Category : Science
Languages : en
Pages : 927

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Book Description
"Presents the most important and up-to-date research related to heat transfer in porous media, focusing on practical applications of the latest studies to engineering products and procedures. Includes theoretical models of fluid flow, capillary effects, application of fractal and percolation characterizing porous materials, multiphase flow and heat transfer, turbulent flow and heat transfer, improved measurement and flow visualization techniques, and enhanced design correlations."

Author: Muhammad Sahimi
Publisher: John Wiley & Sons
ISBN: 3527636706
Category : Science
Languages : en
Pages : 635

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Book Description
In this standard reference of the field, theoretical and experimental approaches to flow, hydrodynamic dispersion, and miscible displacements in porous media and fractured rock are considered. Two different approaches are discussed and contrasted with each other. The first approach is based on the classical equations of flow and transport, called 'continuum models'. The second approach is based on modern methods of statistical physics of disordered media; that is, on 'discrete models', which have become increasingly popular over the past 15 years. The book is unique in its scope, since (1) there is currently no book that compares the two approaches, and covers all important aspects of porous media problems; and (2) includes discussion of fractured rocks, which so far has been treated as a separate subject. Portions of the book would be suitable for an advanced undergraduate course. The book will be ideal for graduate courses on the subject, and can be used by chemical, petroleum, civil, environmental engineers, and geologists, as well as physicists, applied physicist and allied scientists that deal with various porous media problems.

Author: José Luis Acosta
Publisher:
ISBN: 9781606924372
Category : Diffusion
Languages : en
Pages : 0

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Book Description
A porous material is a solid that is saturated by an interconnected network of pores filled with liquid or gas. It is an inorganic or organic cross linked or uncross linked containing pores of all sizes. The pore network is assumed to be continuous, forming two interpenetrating continua such as in a sponge. Examples of porous media range from porous silicon which is porous on the sub manometer scale to limestone caves and underground river systems on the kilometre scale. Most research on porous media analyses the transport processes in a macro scale approximation. This book focuses on semi-analytical solutions for thermo-poroelasticity field equations; pore size from units to hundreds of micro meters and assumptions and reactive processes as well as the mathematical formulations of these models. It represents the different concepts of porous media as it is used in many areas of applied science and engineering. This book presents current activities and new advances of porous media throughout the world.