La conductivité thermique des milieux poreux (au-delà de la détermination de la conductivité thermique des milieux hétérogènes) est fortement influencée par les effets d'évaporation-condensation. Étude d'un matériau granulaire (billes de verre) et d'un milieu consolidé (béton léger) sur une large gamme de températures et d'humidité

Fifty-one papers (and three keynote addresses) on contemporary theoretical issues and experimental techniques pertaining to the underlying factors that control heat-conduction behavior of materials. The latest findings on insulation, fluids, and low-dimensional solids and composites are reviewed as

CE TRAVAIL DE THESE PORTE SUR DES ETUDES EXPERIMENTALES RELATIVES AUX TRANSFERTS MONODIMENSIONNELS D'HUMIDITE SOUS DIFFERENTS GRADIENTS THERMIQUES DANS DES MATERIAUX POREUX QUI SONT: LE BETON AUTOCLAVE NON EXPANSE, LA VERMICULITE, DEUX ROCHES EXTRAITES DE CARRIERES (ROUFFACH ET RORSCHACH) SERVANT A LA RESTAURATION DE MONUMENTS HISTORIQUES. UN DISPOSITIF EXPERIMENTAL EST UTILISE POUR LE SUIVI CONTINU DES EVOLUTIONS DE TENEURS EN EAU (METHODE GAMMAMETRIQUE) ET DE TEMPERATURES (SONDES THERMIQUES) DURANT DES ESSAIS DE CONDENSATION ET DE SECHAGE. L'OBJECTIF PRINCIPAL DE CE TRAVAIL EST LA DETERMINATION DES COEFFICIENTS DE TRANSFERT POUR CHAQUE MATERIAU, DETERMINATION BASEE SUR LA THEORIE CLASSIQUE DU TRANSFERT DE MASSE ET DE CHALEUR DE DE VRIES. LES COEFFICIENTS DE TRANSFERT SONT CALCULES PAR UN PROCEDE DE REGRESSION ENTRE LES VARIABLES MESUREES: FLUX DE MASSE, GRADIENT DE TEMPERATURE ET GRADIENT DE TENEUR EN EAU, ON DONNE LEURS EVOLUTIONS AVEC LA TENEUR EN EAU ET POUR DIFFERENTES TEMPERATURES. D'AUTRES EXPERIENCES SONT AUSSI REALISEES DONNANT LES CONDUCTIVITES THERMIQUES ET LES ISOTHERMES D'ADSORPTION PERMETTANT, AINSI, D'ACQUERIR DES INFORMATIONS SUR LE COMPORTEMENT DES MATERIAUX VIS A VIS DU TRANSFERT DE CHALEUR ET DE VAPEUR D'EAU

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.

Equilibrium and Transfer in Porous Media 3 A porous medium is composed of a solid matrix and its geometrical complement: the pore space. This pore space can be occupied by one or more fluids. The understanding of transport phenomena in porous media is a challenging intellectual task. This book provides a detailed analysis of the aspects required for the understanding of many experimental techniques in the field of porous media transport phenomena. It is aimed at students or engineers who may not be looking specifically to become theoreticians in porous media, but wish to integrate knowledge of porous media with their previous scientific culture, or who may have encountered them when dealing with a technological problem. While avoiding the details of the more mathematical and abstract developments of the theories of macroscopization, the author gives as accurate and rigorous an idea as possible of the methods used to establish the major laws of macroscopic behavior in porous media. He also illustrates the constitutive laws and equations by demonstrating some of their classical applications. The priority is to put the constitutive laws in concrete circumstances without going into technical detail. This third volume in the three-volume series focuses on the applications of isothermal transport and coupled transfers in porous media.