Dynamic characterization of partially saturated engineered porous media and gas diffusion layers using hydraulic admittance

► Performed hydraulic admittance on engineered porous sample with over 100 pores. ► Hydraulic admittance of engineered sample matched predicted simulation response. ► Performed hydraulic admittance on 2 GDL samples at different saturation states. ► Hydraulic admittance spectra of GDL samples show expected frequency dependence. ► Distinct resonance peaks show finite number of pores transport liquid water in GDL.