Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Review Of Enhanced Vapor Diffusion In Porous Media
Download Review Of Enhanced Vapor Diffusion In Porous Media full books in PDF, epub, and Kindle. Read online Review Of Enhanced Vapor Diffusion In Porous Media ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Review of Enhanced Vapor Diffusion in Porous Media by :
Download or read book Review of Enhanced Vapor Diffusion in Porous Media written by and published by . This book was released on 1998 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vapor diffusion in porous media in the presence of its own liquid has often been treated similar to gas diffusion. The gas diffusion rate in porous media is much lower than in free space due to the presence of the porous medium and any liquid present. However, enhanced vapor diffusion has also been postulated such that the diffusion rate may approach free-space values. Existing data and models for enhanced vapor diffusion, including those in TOUGH2, are reviewed in this paper.
Book Synopsis Donesenija komissarov petrogradskogo voenno-revoljucionnogo komiteta. Pod red. G.A. Belova, A.A. Stručkova i S.I. Šul'gi by :
Download or read book Donesenija komissarov petrogradskogo voenno-revoljucionnogo komiteta. Pod red. G.A. Belova, A.A. Stručkova i S.I. Šul'gi written by and published by . This book was released on 1957 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Review of Porous Media Enhanced Vapor-phase Diffusion Mechanisms, Models, and Data by : Clifford K. Ho
Download or read book A Review of Porous Media Enhanced Vapor-phase Diffusion Mechanisms, Models, and Data written by Clifford K. Ho and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Pore-scale Experiment to Evaluate Enhanced Vapor Diffusion in Porous Media by : Thomas S. Silverman
Download or read book A Pore-scale Experiment to Evaluate Enhanced Vapor Diffusion in Porous Media written by Thomas S. Silverman and published by . This book was released on 1999 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas Transport in Porous Media by : Clifford K. Ho
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.
Book Synopsis Pore-scale Modeling of Enhanced Vapor Diffusion in Porous Media by :
Download or read book Pore-scale Modeling of Enhanced Vapor Diffusion in Porous Media written by and published by . This book was released on 1997 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vapor diffusion in porous media in the presence of its liquid has often been analyzed like air diffusion. The diffusion rate is much lower than in free space due to the presence of the porous medium and any liquid present. However, enhanced vapor diffusion has also been postulated such that the diffusion rate may approach free-space values. The mechanisms postulated to lead to this enhancement include condensation/evaporation across isolated liquid islands in the porous media and an increased temperature gradient in the gas phase. In order to try to understand the mechanisms involved in such an enhancement, pore-scale models have been developed. Vapor diffusion in the presence of liquid islands has been evaluated for a one-dimensional pore network under a concentration gradient. The simulations show that significant enhancement of vapor diffusion is indeed possible in the presence of liquid islands, while air diffusion decreases slightly. While the present pore-scale model indicates that enhanced vapor diffusion is possible, only experimental data can confirm the relevant processes.
Book Synopsis Diffusion with Condensation and Evaporation in Porous Media by :
Download or read book Diffusion with Condensation and Evaporation in Porous Media written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vapor phase transport in porous media is important in a number of environmental and industrial processes: soil moisture transport, vapor phase transport in the vadose zone, transport in the vicinity of buried nuclear waste, and industrial processes such as drying. The diffusion of water vapor in a packed bed containing residual liquid is examined experimentally. The objective is to quantify the effect of enhanced vapor diffusion resulting from evaporation/condensation in porous media subjected to a temperature gradient. Isothermal diffusion experiments in free-space were conducted to qualify the experimental apparatus and techniques. For these experiments measured diffusion coefficients are within 3.6% of those reported in the literature for the temperature range from 25 C to 40 C. Isothermal experiments in packed beds of glass beads were used to determine the tortuosity coefficient resulting in [tau] = 0.78 ± 0.028, which is also consistent with previously reported results. Nonisothermal experiments in packed beds in which condensation occurs were conducted to examine enhanced vapor diffusion. The interpretation of the results for these experiments is complicated by a gradual, but continuous, build-up of condensate in the packed beds during the course of the experiment. Results indicate diffusion coefficients which increase as a function of saturation resulting in enhancement of the vapor-phase transport by a factor of approximately four compared to a dry porous medium.
Book Synopsis Coupled Dynamics in Soil by : Yijian Zeng
Download or read book Coupled Dynamics in Soil written by Yijian Zeng and published by Springer Science & Business Media. This book was released on 2012-12-14 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: In arid and semi-arid areas, the main contributions to land surface processes are precipitation, surface evaporation and surface energy balancing. In the close-to-surface layer and root-zone layer, vapor flux is the dominant flux controlling these processes - process which, in turn, influence the local climate pattern and the local ecosystem. The work reported in this thesis attempts to understand how the soil airflow affects the vapor transport during evaporation processes, by using a two-phase heat and mass transfer model. The necessity of including the airflow mechanism in land surface process studies is discussed and highlighted.
Book Synopsis Pore-scale Modeling of Transient and Steady-state Vapor Diffusion in Partially-saturated Porous Media by :
Download or read book Pore-scale Modeling of Transient and Steady-state Vapor Diffusion in Partially-saturated Porous Media written by and published by . This book was released on 1998 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vapor diffusion in porous media in the presence of its own liquid may be enhanced due to pore-scale processes, such as condensation and evaporation across isolated liquid islands. Webb and Ho (1997) developed a mechanistic pore-scale model of these processes under steady-state conditions in which condensation and evaporation on the liquid island were equal. The vapor diffusion rate was significantly enhanced by these liquid island processes by up to an order of magnitude compared to a dry porous media. However, vapor transport by diffusion is often complicated by transient effects, such as in drying applications, in which net evaporation of liquid may further augment the vapor flux from diffusion. The influence of transient effects on the enhancement factors for vapor diffusion is evaluated in this paper. In addition, the effect of vapor pressure lowering on the enhancement factor and on porescale vapor fluxes is shown.
Book Synopsis Water Vapor Diffusion Though Porous Media by : Jalal David Jabro
Download or read book Water Vapor Diffusion Though Porous Media written by Jalal David Jabro and published by . This book was released on 1979 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soil and Groundwater Contamination by : Alex S. Mayer
Download or read book Soil and Groundwater Contamination written by Alex S. Mayer and published by American Geophysical Union. This book was released on 2005-01-14 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM ... "contains spreadsheets used in many of the example calculations, color versions of some of the illustrations, and movies illustrating the NAPL migration."--Page vi.
Book Synopsis An Experimental and Numerical Study of Vapor Diffusion in Porous Media by : Limin Gu
Download or read book An Experimental and Numerical Study of Vapor Diffusion in Porous Media written by Limin Gu and published by . This book was released on 1998 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transport Processes in Nature PB with CD-ROM by : William A. Reiners
Download or read book Transport Processes in Nature PB with CD-ROM written by William A. Reiners and published by Cambridge University Press. This book was released on 2004-07-08 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: William Reiners and Kenneth Driese introduce a conceptual framework for studying the propagation of ecological influences across landscapes. They also provide examples of models that describe and predict propagation. Their volume is an excellent graduate-level introduction to the field of landscape ecology, which is concerned with the effects of spatial patterns on ecological processes, especially the movement of organisms, abiotic materials and energy across landscapes.
Book Synopsis Transport Processes in Nature Hardback with CD-ROM by : William A. Reiners
Download or read book Transport Processes in Nature Hardback with CD-ROM written by William A. Reiners and published by Cambridge University Press. This book was released on 2004-07-08 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: A conceptual framework for the study and understanding of the propagation of ecological influences in nature.
Book Synopsis Diffusion in Natural Porous Media by : Peter Grathwohl
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.
Book Synopsis Heat and Mass Transfer in Drying of Porous Media by : Peng Xu
Download or read book Heat and Mass Transfer in Drying of Porous Media written by Peng Xu and published by CRC Press. This book was released on 2019-07-16 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat and Mass Transfer in Drying of Porous Media offers a comprehensive review of heat and mass transfer phenomena and mechanisms in drying of porous materials. It covers pore-scale and macro-scale models, includes various drying technologies, and discusses the drying dynamics of fibrous porous material, colloidal porous media and size-distributed particle system. Providing guidelines for mathematical modeling and design as well as optimization of drying of porous material, this reference offers useful information for researchers and students as well as engineers in drying technology, food processes, applied energy, mechanical, and chemical engineering.
Book Synopsis Handbook of Porous Media by : Kambiz Vafai
Download or read book Handbook of Porous Media written by Kambiz Vafai and published by CRC Press. This book was released on 2000-07-12 with total page 927 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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."
