Abstract
We present a model for the solidification process of two immisciblefluids interacting repulsively with mobile impurities on a two-dimensional square lattice. In the space of the fluids and impurityconcentrations, the phase diagram exhibits a critical curveseparating a percolating from a non-percolating phase. Estimatedvalues for the fractal dimension and the exponent β of theorder parameter reveal that the critical exponents do not varyalong this curve, i.e., they are independent of the impurityconcentration. The universality class is that of the ordinarypercolation. On the basis of the ideas of the dynamic epidemic andinvasion percolation models, we also propose a model that may berelevant to cleaning porous media by fluid injection. An analysisof the acceptance profile, the fractal dimension and the gapexponent strongly indicate that this model belongs to theuniversality class of the ordinary invasion percolation.
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