Pore-network diagram

The structure of a multiphase medium can be specified by the spatial distribution of the phases that form the medium. This spatial distribution can be generally represented by the phase function or, in specific situations, by the equivalent pore-network diagram, by the spatial distribution of particles or other constituents, and by the probability density function. Examples of the representation of the porous media are shown in Fig. 2. 

Once a pore space is known, a pore network can be created through a variety of methods. Methods that reduce the pore space into a topologically equivalent skeleton involve either a thiiming algorithm or, in the case of the 2D models " -a Voronoi diagram around the material locations. An alternative method to determine the representative pore network for a pore space is the maximal ball method, which is a computationally inexpensive techniqne that has been demonstrated for GDL-like structures. ... 

FIGURE 14J3 Schematic diagram of evaporation in a porous network (a) geometry of pore and boundary layer, (b) liquid partial pressure proMe, and (c) temperature profile. Taken from Castro et ol. [5]. Reprinted by pennissian of the American Ceramic Socieiy. 

Figure 1. Twofold size distributions (at left) and topological diagrams of planes (at right). Sites are circles and bonds are cylinders. Small pores are represented in black, intermediate ones in gray and larger ones remain blank, a) Network la, b) Network Ic and c) Network 3a.

Figure 3. Domain-complexion diagrams (at left) and phase distribution (at right, condensate in black, vapour in blank) within the pores (sites circles, bonds cylinders) on planes of 3D porous networks for actual states of diverse sorption processes, a) Boundary ascending (BA) curve on network la, b) boundary descending (BD) curve on network 2a, c) primary ascending (PA) curve on network 3a and d) primary descending (PD) curve on network 4a. Rc is the critical radius of curvature at the present state of the sorption process and Rc is the critical radius of curvature at the point of reversal for scanning curves. Shaded areas (pores filled with condensate) delimited by full lines in the complexion diagrams represent current states of the sorption systems, broken lines delimit states at the points of reversal.

FIGURE 10.4 Schematic diagram of networks of pores in a silicalite. Solid dots represent junctions, and the... 

Conner and coworkers (refs. 7,8) have recently utilized a pore/throat network model to obtain information about the morphology of materials from mercury penetration data. The void/solid structure is viewed as an interconnected network so that adsorption/desorption and retraction/intrusion can be associated with the openings and constrictions within the void network. These latter investigators analyzed the data as if the materials consisted of agglomerated microspheres. The measured ratio of the most probable radii of intrusion to those of retraction seemed to be characteristic of the void structure and pore shape. Conner et al. (ref. 8) developed a heuristic diagram for the classification of void/solid morphologies from a... 

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