Pore space schematic representation

Figure 2.9.9(a) shows a schematic representation of a thermal convection cell in Rayleigh-Benard configuration [8]. With a downward temperature gradient one expects convection rolls that are more or less distorted by the tortuosity of the fluid filled pore space. In the absence of any flow obstacles one expects symmetrical convection rolls, such as illustrated by the numerical simulation in Figure 2.9.9(b). 

Fig. 3. Schematic representation of a pore space, showing a surface layer h, the pore radius r, and the interpore spacing b.

Mixed sols of Si02-Ti02 create interlayer free spacings of 25-35 A. The pore size is, however, not of the same dimension, the spherical sol particles pack irregularly between the layers and form pores of non-uniform size in the micro-porous range. A schematic representation of this mixed supergallery PILC is given in Fig. 3. 

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