Microstructural effects on the permeability of periodic fibrous porous media

► We present a unified understanding of the effect of microstructure on the macroscopic permeability of fibrous media. ► Based on hydraulic diameter concept, the permeability is expressed in the general form of the Carman-Kozeny equation. ► The finite element (FE) results show that the CK factor depends on the porosity and pore structure. ► These results can be utilized for validation of advanced, coarse-grained models for particle-fluid interactions.