Download or read book Gas Diffusion and Solubility Measurements in Liquid filled Porous Media written by Ronald Dean Garton and published by . This book was released on 1974 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Gas Diffusion in Liquid Filled Porous Media written by Yahia Abubakeur Saleh and published by . This book was released on 1985 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Transport in Porous Media written by Clifford K. Ho and published by Springer Science & Business Media. This book was released on 2006-10-07 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: CLIFFORD K. HOAND STEPHEN W. WEBB Sandia National Laboratories, P. O. Box 5800, Albuquerque, NM 87185, USA Gas and vapor transport in porous media occur in a number of important applications includingdryingofindustrialandfoodproducts,oilandgasexploration,environm- tal remediation of contaminated sites, and carbon sequestration. Understanding the fundamental mechanisms and processes of gas and vapor transport in porous media allows models to be used to evaluate and optimize the performance and design of these systems. In this book, gas and vapor are distinguished by their available states at stan- ? dard temperature and pressure (20 C, 101 kPa). If the gas-phase constituent can also exist as a liquid phase at standard temperature and pressure (e. g. , water, ethanol, toluene, trichlorothylene), it is considered a vapor. If the gas-phase constituent is non-condensable at standard temperature and pressure (e. g. , oxygen, carbon di- ide, helium, hydrogen, propane), it is considered a gas. The distinction is important because different processes affect the transport and behavior of gases and vapors in porous media. For example, mechanisms specific to vapors include vapor-pressure lowering and enhanced vapor diffusion, which are caused by the presence of a g- phase constituent interacting with its liquid phase in an unsaturated porous media. In addition, the “heat-pipe” exploits isothermal latent heat exchange during evaporation and condensation to effectively transfer heat in designed and natural systems.
Download or read book Accuracy Improvement for Measurement of Gas Diffusivity Through Thin Porous Media written by Lu Dong and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate measurement of the gas diffusion coefficient through porous media is of significant interest to science and engineering applications including mass transfer through soils, building materials, and fuel cells to name a few. Accurate measurements are necessary for simulation and optimization of complex systems involving gas transport. The Loschmidt cell, or closed tube method has been extensively used to measuring the binary gas diffusion coefficient of gas pairs. Recent studies have used a modified Loschmidt cell with an additional porous sample to measure the effective diffusion coefficient through the porous sample. The method employs what is called the resistance network method for calculating the effective diffusion coefficient through the porous sample. In this study, a one-dimensional simulation was developed to evaluate the accuracy of the resistance network method with a modified Loschmidt cell. Dimensionless parameters are shown to be applicable for both the conventional Loschmidt cell as well as the modified Loschmidt cell with the porous sample. A parametric simulation study was performed to show that the error relates closely to the ratio of diffusive resistances of the sample and bulk gas denoted as the resistance ratio, [Omega]*. With a simulated experimental duration of 250s, which is typical of experiments in literature, the error was found to be negligible when [Omega]* 0.1 but increased dramatically for [Omega]* 0.1 up to a maximum of approximately 20% error. The equivalent Fourier number, Fo_eq, based on the equivalent diffusivity, D_eq, was proposed as an approximate expression for the degree to which the concentration gradient in the test cell has evolved. It was found that the error has nearly a linear relationship with Fo_eq. Since a lower Fo_eq means a less decayed profile with significant transience remaining, as Fo_eq drops, the the error increases. By controlling the simulation test length for different thickness and diffusivity samples such that Fo_eq = 12.5, the error was reduced to less than 1% over most of the range of parameters and less than 6% over the full range of parameters spanning two orders of magnitude for both thickness and diffusivity. The resistance network method requires the measurement of the sample thickness, a diffusion length, and two diffusion coefficients using with the modified Loschmidt cell (one with the porous sample and one without). Analysis found that the equation used for calculating the effective diffusion coefficient, D_eff, through the porous sample inherently magnifies the relative uncertainty of the measured values in the final calculated value for D_eff. When [Omega]*
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Temperature Dependence of Gas Diffusivities in Porous Media written by Tetsu Keith Tokunaga and published by . This book was released on 1986 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1977 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Transport in Nanoporous Materials written by Wm. Curtis Conner and published by Springer Science & Business Media. This book was released on 2006-05-06 with total page 681 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last several years have seen a dramatic increase in the synthesis of new nanoporous materials. The most promising include molecular sieves which are being developed as inorganic or polymeric systems with 0. 3-30nm in pore dimensions. These nanoporous solids have a broad spectrum of applications in chemical and biochemical processes. The unique applications of molecular sieves are based on their sorption and transport selectivity. Yet, the transport processes in nanoporous systems are not understood well. At the same time, the theoretical capabilities have increased exponentially catalyzed by increases in computational capabilities. The interactions between a diffusing species and the host solid are being studied with increasing details and realism. Further, in situ experimental techniques have been developed which give an understanding of the interactions between diffusing species and nanoporous solids that was not available even a few years ago. The time was ripe to bring together these areas of common interest and study to understand what is known and what has yet to be determined concerning transport in nanoporous solids. Molecular sieves are playing an increasing role in a broad range of industrial petrochemical and biological processes. These include shape-selective separations and catalysis as well as sensors and drug delivery. Molecular sieves are made from inorganic as well as organic solids, e. g. , polymers. They can be employed in packed beds, as membranes and as barrier materials. Initially, the applications of molecular sieves were dominated by the use of zeolites.
Download or read book Fluids in Porous Media written by Henk Huinink and published by Morgan & Claypool Publishers. This book was released on 2016-09-06 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the reader into the field of the physics of processes occurring in porous media. It targets Master and PhD students who need to gain fundamental understanding the impact of confinement on transport and phase change processes. The book gives brief overviews of topics like thermodynamics, capillarity and fluid mechanics in order to launch the reader smoothly into the realm of porous media. In-depth discussions are given of phase change phenomena in porous media, single phase flow, unsaturated flow and multiphase flow. In order to make the topics concrete the book contains numerous example calculations. Further, as much experimental data as possible is plugged in to give the reader the ability to quantify phenomena.
Download or read book The Diffusion of Gases Through Liquids and Allied Experiments written by Carl Barus and published by . This book was released on 1913 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diffusion in Natural Porous Media written by Peter Grathwohl and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion in Natural Porous Media: Contaminant Transport, Sorption/Desorption and Dissolution Kinetics introduces the general principles of diffusion in the subsurface environment and discusses the implications for the fate and transport of contaminants in soils and groundwater. Emphasis is placed on sorption/desorption and the dissolution kinetics of organic contaminants, both of which are limited by the slow speed of molecular diffusion. Diffusion in Natural Porous Media: Contaminant Transport, Sorption/Desorption and Dissolution Kinetics compiles methods for calculating the diffusion coefficients of organic compounds (in aqueous solution or vapor phase) in natural porous media. The author uses analytical solutions of Fick's 2nd law and some simple numerical models to model diffusive transport under various initial and boundary conditions. A number of these models may be solved using spreadsheets. The book examines sorption/desorption rates of organic compounds in various soils and aquifer materials, and also examines the dissolution kinetics of nonaqueous phase liquids in aquifers, in both the trapped residual phase and in pools. Diffusion in Natural Porous Media: Contaminant Transport, Sorption/Desorption and Dissolution Kinetics concludes with a discussion of the impact of slow diffusion processes on soil and groundwater decontamination and the implications of these processes for groundwater risk assessment.
Download or read book Petroleum Abstracts written by and published by . This book was released on 1969 with total page 1808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mathematics of Diffusion written by John Crank and published by Oxford University Press. This book was released on 1979 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Download or read book Diffusion written by E. L. Cussler and published by Cambridge University Press. This book was released on 2009-01-15 with total page 655 pages. Available in PDF, EPUB and Kindle. Book excerpt: The clearest coverage available of diffusion and mass transfer, which is a key part of the chemical engineering curriculum.
Download or read book Advanced Engineering and Technology written by Liquan Xie and published by CRC Press. This book was released on 2014-03-18 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Engineering and Technology contains 110 technical papers from the 2014 Annual Congress on Advanced Engineering and Technology (CAET 2014, Hong Kong, 19-20 April 2014, including the 4th Workshop on Applied Mechanics and Civil Engineering, AMCE 2014). The contributions focus on advanced theories and technologies related to building engineering, geotechnical engineering, road and bridge engineering, hydraulic engineering, environmental engineering, pollution and control, water resources and water treatment, mechanics in engineering, water and soil conservation, numerical software and applications, climate change and environmental dynamics, intelligent safety systems, chemistry, biochemical and food engineering, and modelling and data analysis. Advanced Engineering and Technology will be useful to academics and professionals involved in civil engineering, hydraulic engineering, environmental engineering, modelling & data analysis, chemistry and biochemical engineering, and other related fields.
Download or read book Measurements of the Flow of Gases Through Porous Media by the Pressure Decay Method written by Nathan Bassin and published by . This book was released on 1955 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Momentum Heat and Mass Transfer written by James P. Welty and published by John Wiley & Sons. This book was released on 2019-03-18 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
