Homogeneous particle packings and porous masses. Some experimental techniques

Network analysis of filter cake pore structure by high resolution X-ray microtomography

“…The surface porosity with respect to the cake depth is shown in Figure 6. The surface porosity behavior is similar to the results presented by Brakel and Heertjes [14]. …”

Contact angle and film jumps

“…(vii) Finally, we may emphasize two related problem areas that are directly relevant to the problem of obtaining reliable experimental data. First, we need techniques to make homogeneous porous media and techniques to check this homogeneity [318]. Secondly we need a reliable technique to measure the contact angle of porous media.…”

“…In the case of glass beads, experiments were also carried out with consolidated porous media, i e the particles are sintered together without noticeable disturbance of the packing or deformation of the particles. The packing technique, the homogeneity measurement by means of X-ray absorption, and the sintering technique have been described m detail elsewhere [318].…”

“…Usually, the height of the column was scanned with steps of 2.5 mm. The relation between the logarithm of the transmitted intensity, I, an the liquid content, u, is linear [318], but, because of the z(h) fluctuations, the constants differ for different heights. Therefore it is necessary to know, for each height, the intensity at zero and complete saturation, Jo and Iioo respectively.…”

“…Homogeneous media display a scatter in c{h) of 0.1-0.4 % absolute. See [318] for details and examples of e{h).…”