Permeability, tortuosity, and attenuation of waves in porous materials
Journal Title: Civil and Environmental Engineering Reports - Year 2010, Vol 1, Issue 5
Abstract
The paper contains a consistent presentation of the construction of a linear poroelastic model and its applications in the theory of acoustic waves. The main purpose of this presentation is the discussion of material parameters describing the diffusion. This concerns particularly the permeability and tortuosity. In Section 2 we mention a few examples of porous systems in which diffusion processes play an important role. Section 3 contains a concise description of the two-component model describing saturated porous materials with diffusion. We point out the main features of such a system with the special emphasis of relative motion of components and changes of porosity. As a special case the governing equations of Biot’s model are presented. In Section 4 we discuss the notions of permeability, hydraulic conductivity and tortuosity. In particular the notion of the tortuosity tensor is introduced. Section 5 is the primer of the nuclear magnetic resonance method of experimental determination of permeability and tortuosity in various porous materials. Finally, Section 6 contains some issues concerning the propagation of monochromatic waves and, in particular, an influence of tortuosity on speeds and attenuation<br/><br/>
Authors and Affiliations
K. Wilmański
Keywords
Related Articles
- EP ID EP272956
- DOI -
- Views 75
- Downloads 0
QUARTER MODERNIZATION OF CONSTRUCTION RESIDENTIAL "NEW PRAGA" IN WARSAW - RISKS AND POSSIBILITIES
The district “New Praga” is located on the right-bank of Warsaw in North Praga which is one of the oldest districts of the city. The citizens of this district, where an analyzed building quarter is located, are people wi...
SOME ASPECTS OF CHEMICAL COMPOSITION OF GEOLOGICAL STRUCTURE OF „ANTROPOGENIC LAKE DISTRICT”
The research results of some aspects of soil chemical composition in the surroundings of the biggest pit, acid reservoir located on Łuk Mużakowski (SW Poland)are presented. Samples were taken every 1m depth, from three 2...
The directions of protection and development of natural environment of a metropolis on the example of the Poznań Metropolitan Area
The aim of this study is a presentation of issues related to directions of changes which take place in natural environment in heavily urbanized areas, in a metropolis and the interaction of the central city and municipal...
On solving selected problems of linear algebra by means of neural networks
The paper presents selected practical applications and results of computer simulations from the field of numerical linear algebra realized by means of neural networks. Bearing in mind aspects of applications, it has been...
STATIC EQUILIBRIUM PATHS OF STEEL-CONCRETE COMPOSITE BEAM STRENGTHENED UNDER LOAD
The paper presents exemplary static equilibrium paths of an element strengthened while under load. A steel-concrete composite beam was analyzed. The study discusses the effect of strengthening method, initial load values...