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Experimental studies of grain boundary invasion by a wetting fluid give clear evidence for a size dependence. In order to get a better numerical insight into grain boundary (GB) wetting as a percolation process, we have investigated size effects during gallium penetration into quasi-2D zinc polycrystalline strips of various width and during water penetration into 3D cylindrical NaCl polycrystals. Both systems are likely to be good objects for studying percolation effects because of a random distribution of wettable GB’s. Computer simulation on the square lattice, with a “wetting” probabilityp= 0.60 close to the number of experimental points (several dozens), shows a striking resemblance between both sets of data. Making more runs (about 105) demonstrates consistency of our model with an earlier reported work by Marrink and Knackstedt describing finite size effects in elongated lattices. Using their approach, an excellent agreement can be obtained between the experimental and simulated data, as well as between the latter and theoretical predictions. [ABSTRACT FROM AUTHOR]

The intergrain penetration of wetting liquids (water and gallium) is studied with polycrystalline samples of NaCl and zinc, respectively. A strong effect of a scale factor is found. The quantitative correlation between the results of simulation and the data of physical experiments is established and is indicative of the applicability of the percolation theory to describe the process of intergrain wetting. [ABSTRACT FROM AUTHOR]