Author: Arun SarinPublisher:
ISBN:
Category :
Languages : en
Pages : 116
Book Description
Simulation of the Diffusion of Gases in Porous Solids
Author: Arun SarinA Monte Carlo Simulation of the Diffusion of Gases and Radiant Heat Transfer in Porous Solids
Author: Mohammad Hasan AbbasiPublisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 95
Book Description
Molecular Simulation Studies of Adsorption and Diffusion
Author: Bei LiuThe Application of Percolation Theory and Monte Carlo Simulation to Gas Diffusion in Porous Solids and Chemical Vapor Infiltration
Author: Lucia My FengGas Transport in Porous Media
Author: Clifford K. HoPublisher: Springer Science & Business Media
ISBN: 140203962X
Category : Science
Languages : en
Pages : 442
Book Description
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.
Diffusion In Porous Solids
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Diffusion in bulk has been well studied and our understanding may be said to be adequate if not complete. Similarly, surface diffusion has been investigated by a number of workers and a fair understanding of it has emerged. When guest particles are confined within the micropores of solids such as zeolites, the resulting phase is neither bulk nor an adsorbed phase but something in between. Properties of such a phase have not been understood sufficiently. Such phase found within these porous solids display rich variety in their property. In part, such a variety arises from the large number of factors that determine their properties. Present thesis attempts to study the relationship of some of these factors, viz., the pore size and the disorder in the pore sizes, the sorbate sizes, the role of orienta-tional motion, the inhomogeneities in temperature etc. to diffusion of the guest molecules in porous solids. Chapter 1 gives a brief overview of the literature and the present understanding in the field of diffusion of spherical atoms and small molecules in microporous materials with special attention to zeolites., The discussion is focussed on the experimental, theoretical and computer simulation results reported in the last few years. In chapter 2 an analytic expression is derived for the diffusion coefficient of a sorbate in a crystalline porous solid with bottlenecks. This is done by assuming a situation of quasiequi-Hbrium and by applying some elementary results of kinetic theory of gases. The diffusion coefficients obtained from the analytic expression is found to agree well with the molecular dynamics results. Further, it is found to reproduce the diffusion anomaly and its temperature dependence for different zeolites such as Y, A and p. The present calculations provide a strong theoretical support for the levitation effect obtained so far purely from molecular dynamics calculations. The computational effort involved in evaluating the derived expression is at least.
Molecular and Knudsen Diffusion of Gases in Porous Solids
Author: Ralph Sanford CunninghamPublisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 270
Book Description
Diffusion in Gases and Porous Solids
Author: R. E. CunninghamComputer Simulation of Diffusion of Simple Gases Through Porous Media
Author: Xiaojin XiAdsorption and Diffusion
Author: Hellmut G. KargePublisher: Springer Science & Business Media
ISBN: 3540739661
Category : Science
Languages : en
Pages : 411
Book Description
"Molecular Sieves - Science and Technology" covers, in a comprehensive manner, the science and technology of zeolites and all related microporous and mesoporous materials. The contributions are grouped together topically in such a way that each volume deals with a specific sub-field. Volume 7 treats fundamentals and analyses of adsorption and diffusion in zeolites including single-file diffusion. Various methods of measuring adsorption and diffusion are described and discussed.