Particle size ratio;

model taking in account this effect was suggested that can be useful in the characteriza-including porosity, pore size, shape, and tortuosity, etc., being a key parameter on the development of models for fluid flow and mass transfer in porous media. Even for the simple case of binary packing, formed by particles that dif-fer in particle size, the influence of porosity and related in numerous works (Yu and Standish, 1988) and it has been observed that most of the granular packings found in nature have a random structure (Cheng et al., 2000). An analyti-cal–parametric theory of the random packing of particles developed by Yu and Standish (1988) shows the existence of two packing mechanisms: the filling mechanism and the occupation mechanism. The interplay of different packing mechanisms at different particle size ratio and binary mixture composition together with packing imperfection