Results from numerical simulations on two‐dimensional networks used as an analog to pore
space in porous rocks are presented to emphasize the existence of preferential paths for
transport processes in heterogeneous media. The simulations show that hydraulic flow and
electrical current are mostly driven in the so‐called “critical paths” when the pore size
distribution has a decreasing exponential‐like shape in opposition to nearly homogeneous
or uniform like distributions. The geometry of these flow paths is controlled by spatially …