[PDF] Flow And Diffusion Of Gases Through Porous Media eBook

Author : Clifford K. Ho
Publisher : Springer Science & Business Media
Page : 442 pages
File Size : 25,34 MB
Release : 2006-10-07
Category : Science
ISBN : 140203962X

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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.

Author : Roberto Cunningham
Publisher : Springer Science & Business Media
Page : 293 pages
File Size : 46,56 MB
Release : 2013-06-29
Category : Science
ISBN : 147574983X

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The world we live in exhibits, on different scales, many phenomena related to the diffusion of gases. Among them are the movement of gases in earth strata, the aeration of soils, the drying of certain materials, some catalytic reactions, purification by adsorption, isotope separation, column chro matography, cooling of nuclear reactors, and the permeability of various packing materials. The evolution of the understanding of this subject has not always been straightforward and progressive-there has been much confusion and many doubts and misunderstandings, some of which remain to this day. The main reason for the difficulties in the development of this subject is, we now know, the lack of an understanding of the effects of walls on diffusing systems. Textbooks usually treat diffusion on two levels: at the physicochemi cal or molecular level, making use of the kinetic theory of gases (which while a very rigorous and well-founded theory nevertheless is valid only for systems without walls), or at the level of a transport phenomenon, a level geared toward applications. The influence of walls is usually disregarded or is treated very briefly (for example, by taking account of the Knudsen regime or by introducing a transition regime of limited validity) in a way unconnected with previous studies. As a consequence, the extensive, gener alized, and well-founded knowledge of systems without walls has often been applied without sound basis to real situations, i.e., to systems with walls.

Author : Edward Allen Mason
Publisher :
Page : 212 pages
File Size : 11,99 MB
Release : 1983
Category : Gas dynamics
ISBN :

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This monograph gives an historical account of the development of the dusty-gas model for the description of gas transport in porous media, and describes the model and its applications in sufficient detail that it can be employed in engineering practice.

Author : Robert Wayne Zimmerman
Publisher : Wspc (Europe)
Page : 0 pages
File Size : 15,64 MB
Release : 2018
Category : Fluids
ISBN : 9781786344991

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Pressure diffusion equation for fluid flow in porous rocks -- Line source solution for a vertical well in an infinite reservoir -- Superposition and pressure buildup tests -- Effect of faults and linear boundaries -- Wellbore skin and wellbore storage -- Production from bounded reservoirs -- Laplace transform methods in reservoir engineering -- Naturally-fractured reservoirs -- Flow of gases in porous media