Catálogo de publicaciones - libros

The objective of this paper is a fluid saturated capillary-porous material under drying process. The aim of this paper is to present the theoretical model enabling numerical calculation of the drying induced stresses, and the acoustic emission method (AE) as an experimental method for monitoring the material destruction. It is shown that the period of drying in which the drying induced stresses reach their maximum is accompanied by an enhanced emission of acoustic signals. These phenomena are illustrated on the example of a cylindrically shaped kaolin sample exposed to convective drying.

In this contribution, the coupled flow of liquids and gases in capillary thermoelastic porous materials is investigated by using a continuum mechanical model based on the Theory of Porous Media. The movement of the phases is influenced by the capillarity forces, the relative permeability, the temperature and the given boundary conditions. In the examined porous body, the capillary effect is caused by the intermolecular forces of cohesion and adhesion of the constituents involved. The treatment of the capillary problem, based on thermomechanical investigations, yields the result that the capillarity force is a volume interaction force. Moreover, the friction interaction forces caused by the motion of the constituents are included in the mechanical model. The relative permeability depends on the saturation of the porous body which is considered in the mechanical model. In order to describe the thermo-elastic behaviour, the balance equation of energy for the mixture must be taken into account. The aim of this investigation is to provide with a numerical simulation of the behavior of liquid and gas phases in a thermo-elastic porous body.