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The Relation Between Thermal Transpiration and Surface Diffusion in Porous Media
Thermo-molecular Flow Through Porous Media-thermal Transpiration - and the Utility of Its Pumping Effect
Handbook of Porous Media
Author: Kambiz Vafai
Publisher: CRC Press
Published: 2005-03-30
Total Pages: 771
ISBN-13: 0415876389
DOWNLOAD EBOOK →Over the last three decades, advances in modeling flow, heat, and mass transfer through a porous medium have dramatically transformed engineering applications. Comprehensive and cohesive, Handbook of Porous Media, Second Edition presents a compilation of research related to heat and mass transfer including the development of practical applications
Principles of Heat Transfer in Porous Media
Author: M. Kaviany
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 636
ISBN-13: 1468404121
DOWNLOAD EBOOK →Although the empirical treatment of fluid flow and heat transfer in porous media is over a century old, only in the last three decades has the transport in these heterogeneous systems been addressed in detail. So far, single-phase flows in porous media have been treated or at least formulated satisfactorily, while the subject of two-phase flow and the related heat-transfer in porous media is still in its infancy. This book identifies the principles of transport in porous media and compares the avalaible predictions based on theoretical treatments of various transport mechanisms with the existing experimental results. The theoretical treatment is based on the volume-averaging of the momentum and energy equations with the closure conditions necessary for obtaining solutions. While emphasizing a basic understanding of heat transfer in porous media, this book does not ignore the need for predictive tools; whenever a rigorous theoretical treatment of a phenomena is not avaliable, semi-empirical and empirical treatments are given.
Thermal Flows in Porous Media
Author: H.I. Ene
Publisher: Springer
Published: 1987-08-31
Total Pages: 208
ISBN-13: 9789027722256
DOWNLOAD EBOOK →Thermal flow in porous media is important in a wide range of areas, including oil recovery, geothermal development, the chemical and nuclear industries, civil engineering, energy storage and energy conversion. This monograph uses a systematic, rigorous and unified treatment to provide a general understanding of the phenomena involved. General equations for single- or multiphase flow (including an arbitrary number of components inside each phase), diffusion and chemical reactions are presented. The boundary conditions which may be imposed, the non-dimensional parameters, the structure of the solutions, the stability of finite amplitude solutions and many other related topics are also studied. Although the treatment is basically mathematical, specific physical problems are also dealt with. There are two major fields of application: natural convection and underground combustion. Both are discussed in detail. Various examples with exact or numerical solutions in the case of bounded or unbounded domains are presented, accompanied by extensive comment.
Buoyancy-Driven Flow in Fluid-Saturated Porous Media near a Bounding Surface
Author: Hitoshi Sakamoto
Publisher: Springer
Published: 2018-06-11
Total Pages: 104
ISBN-13: 3319898876
DOWNLOAD EBOOK →This Brief reports on heat transfer from a solid boundary in a saturated porous medium. Experiments reveal overall heat transfer laws when the flow along the wall is driven by buoyancy produced by large temperature differences, and mathematical analysis using advanced volume-averaging techniques produce estimates of how heat is dispersed in the porous zone. Engineers, hydrologists and geophysicists will find the results valuable for validation of laboratory and field tests, as well as testing their models of dispersion of heat and mass in saturated media.
The Determination of Surface Permeability of Porous Media from Thermal Transpiration Measurements
Numerical Analysis of Convection/transpiration Cooling
Author: David E. Glass
Publisher:
Published: 1999
Total Pages: 16
ISBN-13:
DOWNLOAD EBOOK →An innovative concept utilizing the natural porosity of refractory-composite materials and hydrogen coolant to provide CONvective and TRANspiration (CONTRAN) cooling and oxidation protection has been numerically studied for surfaces exposed to a high heat flux, high temperature environment such as hypersonic vehicle engine combustor walls. A boundary layer code and a porous media finite difference code were utilized to analyze the effect of convection and transpiration cooling on surface heat flux and temperature. The boundary layer code determined that transpiration flow is able to provide blocking of the surface heat flux only if it is above a minimum level due to heat addition from combustion of the hydrogen transpirant. The porous media analysis indicated that cooling of the surface is attained with coolant flow rates that are in the same range as those required for blocking, indicating that a coupled analysis would be beneficial.
Convective Heat Transfer in Porous Media
Author: Yasser Mahmoudi
Publisher: CRC Press
Published: 2019-11-06
Total Pages: 381
ISBN-13: 0429672047
DOWNLOAD EBOOK →Focusing on heat transfer in porous media, this book covers recent advances in nano and macro’ scales. Apart from introducing heat flux bifurcation and splitting within porous media, it highlights two-phase flow, nanofluids, wicking, and convection in bi-disperse porous media. New methods in modeling heat and transport in porous media, such as pore-scale analysis and Lattice–Boltzmann methods, are introduced. The book covers related engineering applications, such as enhanced geothermal systems, porous burners, solar systems, transpiration cooling in aerospace, heat transfer enhancement and electronic cooling, drying and soil evaporation, foam heat exchangers, and polymer-electrolyte fuel cells.
