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Author : Frank J. Purtell
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (299 download)
Download or read book Single and Multicomponent Vapor Phase Diffusion in a Porous Synthetic Media written by Frank J. Purtell and published by . This book was released on 1999 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Clifford K. Ho
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (56 download)
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:
Author : Dennis M. Lehman
Publisher :
ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.:/5 (299 download)
Download or read book Porosity/tortuosity Concepts in Vapor Phase Diffusion Modeling for Porous Media written by Dennis M. Lehman and published by . This book was released on 1996 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Omar Rafae Mahmood Al Omar
Publisher : Cuvillier Verlag
ISBN 13 : 3736983700
Total Pages : 218 pages
Book Rating : 4.7/5 (369 download)
Download or read book Modeling and simulation of complete liquid-vapor phase change process inside porous media written by Omar Rafae Mahmood Al Omar and published by Cuvillier Verlag. This book was released on 2016-10-17 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work deals with modeling and numerical simulation of fluid flow and heat transfer associated with phase change process inside both isotropic and anisotropic porous media, based on the Two-Phase Mixture Model (TPMM) along with the assumption of Local Thermal Equilibrium (LTE) and Non-Equilibrium (LTNE) conditions. In particular, it demonstrates the necessity and usefulness of a newly proposed smoothing algorithm for handling the sharp discontinuities in the effective diffusion coefficient in order to avoid the occurrence of non-physical “jump” in the predicted temperature distribution during the numerical simulation of the complete phase change process inside porous media. For the purpose of demonstration, one- and two-dimensional phase change problems operated in the Darcy flow regime have been considered.The Finite Volume Method (FVM) has been used on both staggered and non-staggered grid layouts in order to solve the governing conservation equations. In this work, after critically analyzing the drawbacks of the existing enthalpy formulation based on TPMM, a modified formulation has been also developed that can easily accommodate substantial density variations in the single phase regions. The results obtained from the modified enthalpy formulation have been compared with that predicted by the existing modified volumetric enthalpy formulation and excellent agreements have been observed for all tested cases. A thorough parametric study, using both LTE and LTNE models, indicates that the adoption of the proposed smoothing algorithm successfully eliminates “jump” in the predicted temperature distribution and does not alter the overall energy and momentum balance. All tested cases, covering applicable ranges of parametric variations, could be physically interpreted. The methodology is, therefore, recommended for future simulations of complete phase change process inside porous media. The results also show that the modified enthalpy formulation requires significantly less computation time thanmodified volumetric enthalpy formulation.
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (871 download)
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.
Author : Sandeep Chugh
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (153 download)
Download or read book Diffusion of Multicomponent Liquid Mixture Through Porous Media written by Sandeep Chugh and published by . This book was released on 1989 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Clifford K. Ho
Publisher : Springer Science & Business Media
ISBN 13 : 140203962X
Total Pages : 442 pages
Book Rating : 4.4/5 (2 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 1314 pages
Book Rating : 4.F/5 ( download)
Download or read book Petroleum Abstracts written by and published by . This book was released on 1971 with total page 1314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lawrence J. Dunne
Publisher : Springer Science & Business Media
ISBN 13 : 9048124816
Total Pages : 301 pages
Book Rating : 4.0/5 (481 download)
Download or read book Adsorption and Phase Behaviour in Nanochannels and Nanotubes written by Lawrence J. Dunne and published by Springer Science & Business Media. This book was released on 2009-09-24 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Channels of nanotubular dimensions exist in a variety of materials (examples are carbon nanotubes and the nanotubular channels of zeolites and zeotypes) and show promise for numerous applications due to their unique properties. One of their most important properties is their capacity to adsorb molecules and these may exist in a variety of phases. "Adsorption and Phase Behaviour in Nanochannels and Nanotubes" provides an excellent review of recent and current work on adsorption on nanometerials. It is an impressive collection of papers dealing with the adsorption and phase behaviour in nanoporous materials from both experimental and theoretical perspectives. "Adsorption and Phase Behaviour in Nanochannels and Nanotubes" focuses on carbon nanotubes as well as zeolites and related materials.
Author : United States. Office of Saline Water
Publisher :
ISBN 13 :
Total Pages : 918 pages
Book Rating : 4.3/5 (91 download)
Download or read book Research and Development Progress Report written by United States. Office of Saline Water and published by . This book was released on 1970 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Athanasios I. Liapis
Publisher : American Institute of Chemical Engineers
ISBN 13 :
Total Pages : 688 pages
Book Rating : 4.X/5 (1 download)
Download or read book Proceedings of the Second Engineering Foundation Conference on Fundamentals of Adsorption written by Athanasios I. Liapis and published by American Institute of Chemical Engineers. This book was released on 1987 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 904 pages
Book Rating : 4.F/5 ( download)
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nichigai Asoshiētsu
Publisher :
ISBN 13 :
Total Pages : 640 pages
Book Rating : 4.3/5 (91 download)
Download or read book AIChE Publications written by Nichigai Asoshiētsu and published by . This book was released on 1973 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 892 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Duong D Do
Publisher : World Scientific
ISBN 13 : 1783262249
Total Pages : 915 pages
Book Rating : 4.7/5 (832 download)
Download or read book Adsorption Analysis: Equilibria And Kinetics (With Cd Containing Computer Matlab Programs) written by Duong D Do and published by World Scientific. This book was released on 1998-09-22 with total page 915 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers topics of equilibria and kinetics of adsorption in porous media. Fundamental equilibria and kinetics are dealt with for homogeneous as well as heterogeneous particles. Five chapters of the book deal with equilibria and eight chapters deal with kinetics. Single component as well as multicomponent systems are discussed. In kinetics analysis, we deal with the various mass transport processes and their interactions inside a porous particle. Conventional approaches as well as the new approach using Maxwell-Stefan equations are presented. Various methods to measure diffusivity, such as the Differential Adsorption Bed (DAB), the time lag, the diffusion cell, chromatography, and the batch adsorber methods are also covered by the book. It can be used by lecturers and engineers who wish to carry out research in adsorption. A number of programming codes written in MatLab language are included so that readers can use them directly to better understand the behavior of single and multicomponent adsorption systems.
Author :
Publisher :
ISBN 13 :
Total Pages : 2668 pages
Book Rating : 4.3/5 (91 download)
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leonard R. MacGillivray
Publisher : John Wiley & Sons
ISBN 13 : 1118931580
Total Pages : 1210 pages
Book Rating : 4.1/5 (189 download)
Download or read book Metal-Organic Framework Materials written by Leonard R. MacGillivray and published by John Wiley & Sons. This book was released on 2014-09-19 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-Organic Frameworks (MOFs) are crystalline compounds consisting of rigid organic molecules held together and organized by metal ions or clusters. Special interests in these materials arise from the fact that many are highly porous and can be used for storage of small molecules, for example H2 or CO2. Consequently, the materials are ideal candidates for a wide range of applications including gas storage, separation technologies and catalysis. Potential applications include the storage of hydrogen for fuel-cell cars, and the removal and storage of carbon dioxide in sustainable technical processes. MOFs offer the inorganic chemist and materials scientist a wide range of new synthetic possibilities and open the doors to new and exciting basic research. Metal-Organic Frameworks Materials provides a solid basis for the understanding of MOFs and insights into new inorganic materials structures and properties. The volume also reflects progress that has been made in recent years, presenting a wide range of new applications including state-of-the art developments in the promising technology for alternative fuels. The comprehensive volume investigates structures, symmetry, supramolecular chemistry, surface engineering, recognition, properties, and reactions. The content from this book will be added online to the Encyclopedia of Inorganic and Bioinorganic Chemistry: http://www.wileyonlinelibrary.com/ref/eibc
