Séchage Des Milieux Poreux Déformables Non Saturés

Séchage Des Milieux Poreux Déformables Non Saturés

Author: Saber Chemkhi

Publisher: Omniscriptum

Published: 2010-12

Total Pages: 156

ISBN-13: 9786131556739

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Le thème de cette étude est la modélisation du séchage d'un milieu poreux, déformable et partiellement saturé. La modélisation tient compte de la nature du produit ainsi que des conditions initiales et de sa forme. L'objectif est de prévoir les contraintes liées au retrait volumique, afin decontrôler la déformation du produit. La problématique se pose au niveau de la transition entre milieu saturé et milieu non saturé où il n'existe pas actuellement de modélisation physique continue. Dans ce travail, on propose un modèle, décrivant les transferts de chaleur, de masse et de quantité de mouvement, appliqués au séchage d'un milieu non saturé et déformable. La particularité du modèle est qu'il tient compte du fort couplage entre le transport de l'humidité et le comportement rhéologique du matériau en utilisant la notion de contrainte effective. Le modèle est validé pour une argile à différentes conditions de séchage convectif. Les simulations montrent la faisabilité du modèle proposé et l'étude de sensibilité met en évidence la forte influence de la perméabilité du matériau et de la pression capillaire d'une part, et les propriétés rhéologiques d'autre part.


Natural Draught Cooling Towers

Natural Draught Cooling Towers

Author: I. Mungan

Publisher: CRC Press

Published: 2004-04-15

Total Pages: 406

ISBN-13: 1482283913

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The world's most experienced scientists and professionals working on cooling towers gathered at the 5th International Symposium on Natural Draught Cooling Towers to discuss the latest developments in this area and exchange knowledge and experiences. This book comprises 43 contributions on the latest developments in the field of natural draught cool


Modelling and Applications of Transport Phenomena in Porous Media

Modelling and Applications of Transport Phenomena in Porous Media

Author: Jacob Bear

Publisher: Springer Science & Business Media

Published: 1991-11-30

Total Pages: 398

ISBN-13: 9780792314431

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Transport phenomenain porous media are encounteredin various disciplines, e. g. , civil engineering, chemical engineering, reservoir engineering, agricul tural engineering and soil science. In these disciplines, problems are en countered in which various extensive quantities, e. g. , mass and heat, are transported through a porous material domain. Often, the void space of the porous material contains two or three fluid phases, and the various ex tensive quantities are transported simultaneously through the multiphase system. In all these disciplines, decisions related to a system's development and its operation have to be made. To do so a tool is needed that will pro vide a forecast of the system's response to the implementation of proposed decisions. This response is expressed in the form of spatial and temporal distributions of the state variables that describe the system's behavior. Ex amples of such state variables are pressure, stress, strain, density, velocity, solute concentration, temperature, etc. , for each phase in the system, The tool that enables the required predictions is the model. A model may be defined as a simplified version of the real porous medium system and the transport phenomena that occur in it. Because the model is a sim plified version of the real system, no unique model exists for a given porous medium system. Different sets of simplifying assumptions, each suitable for a particular task, will result in different models.


Mechanics of Porous Continua

Mechanics of Porous Continua

Author: Olivier Coussy

Publisher: Wiley

Published: 1995-12-05

Total Pages: 472

ISBN-13: 9780471952671

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This book provides a unified and systematic continuum approach for engineers and applied physicists working on the modelling of porous media. Self-contained, it sets out—from a macroscopic point of view—the main concepts and results of deformable porous media subject to the flow of one or several fluids. The theory presented includes developments in the areas of thermodynamics, poroelastoplasticity, poroviscoplasticity, wave propagation and surfaces of discontinuity, boundary value problems and numerical methods, as well as chemico-mechanical couplings. It can be used for numerous diversified applications in geophysics, civil engineering, biomechanics, material science, etc.


The Method of Volume Averaging

The Method of Volume Averaging

Author: S. Whitaker

Publisher: Springer Science & Business Media

Published: 2013-03-09

Total Pages: 236

ISBN-13: 9401733899

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Multiphase systems dominate nearly every area of science and technology, and the method of volume averaging provides a rigorous foundation for the analysis of these systems. The development is based on classical continuum physics, and it provides both the spatially smoothed equations and a method of predicting the effective transport coefficients that appear in those equations. The text is based on a ten-week graduate course that has been taught for more than 20 years at the University of California at Davis and at other universities around the world. Problems dealing with both the theoretical foundations and the applications are included with each chapter, and detailed solutions for all problems are available from the author. The course has attracted participants from chemical engineering, mechanical engineering, civil engineering, hydrologic science, mathematics, chemistry and physics.


Mathematical Modeling for Flow and Transport Through Porous Media

Mathematical Modeling for Flow and Transport Through Porous Media

Author: Gedeon Dagan

Publisher: Springer Science & Business Media

Published: 1991

Total Pages: 312

ISBN-13: 9780792316169

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This book contains a selection of articles presented at an International Workshop on `Mathematical Modeling for Flow and Transport Through Porous Media'. The major topics of the meeting were free and moving boundary problems, structured media, multiphase flow, scale problems, stochastic aspects, parameter identification and optimization problems. The volume also represents a few contributions on the incorporation of chemical and biological processes in mathematical models for transport in porous media. The book is directed at researchers active in porous media, mathematical modeling, petroleum and geotechnical engineering and environmental sciences.


High Performance Concrete

High Performance Concrete

Author: Y. Malier

Publisher: CRC Press

Published: 2018-05-08

Total Pages: 570

ISBN-13: 1351440896

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Provides a thorough review of properties, durability and use of high performance concrete, derived from recent research and experience. This book contains contributions from the leading French, Canadian and Swiss researchers, designers and material specialists, translated into English for the first time.