Orientated-type　flow　channels　of　proton　exchange　membrane　fuel　cells　cause　non-Darcy　effect　occurring　in　flow　regions.　Therefore,　the　species　transportation　is　affected　by　inertial　effect.　However,　how　the　inertial　force　affects　convection　and　diffusion　of　different　species　has　not　been　discussed　before.　Thus,　a　modified　two-dimensional,　non-isothermal,　two-phase　and　steady　state　model　considering　non-Darcy　effect　is　employed　in　this　study,　and　reactants　and　products　transportations　through　diffusion　and　convection　under　inertial　effects　are　quantitatively　analyzed　for　the　first　time.　Simulation　results　reveal　that　the　convective　transportation　of　reactants　increases　more　under　the　influence　of　inertial　force;　water　vapor　transportation　through　convection　increases　the　water　content　in　porous　regions.　At　the　same　time,　liquid　water　expels　more　rapidly　from　gas　diffusion　layers　under　baffle　regions,　and　enlarging　baffle　volumes　increases　the　regions　where　the　liquid　water　is　rapidly　removed　under　the　inertial　effect.　(c)　2021　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.