kappa_s 1000[S/m] Conductivity, solid phase kappa_m 9[S/m] Conductivity, membrane V_cell 0.7[V] Cell voltage T 353[K] Temperature kappa_p 1e-13[m^2] GDL permeability eta 2.1e-5[Pa*s] Fluid viscosity p_ref 1[atm] Reference pressure p_a_in 1.1*p_ref Anode inlet pressure p_c_in 1.1*p_ref Cathode inlet pressure drag 3 Proton-Water drag coefficient through membrane E_eq_a 0[V] Equilibrium potential, anode E_eq_c 1[V] Equilibrium potential, cathode i0_a 1e5[A/m^2] Exchange current density, anode i0_c 1[A/m^2] Exchange current density, cathode S 1e7[m^2/m^3] Specific surface area R_agg 0.1[um] Aggregate radius eps_mic 0.2 Microscopic porosity inside agglomerates eps_mac 0.4 Macroscopic porosity between agglomerates D_agg 1.2e-10[m^2/s]*((1-eps_mac)*eps_mic)^1.5 Effective diffusion coefficient inside agglomerates D_effH2_H2O 0.915e-4[m^2/s]*(T/307.1[K])^1.5*(eps_mac)^1.5 Effective binary diffusivity, H2_H2O D_effO2_N2 0.22e-4[m^2/s]*(T/293.2[K])^1.5*(eps_mac)^1.5 Effective binary diffusivity, O2_N2 D_effH2O_N2 0.256e-4[m^2/s]*(T/307.5[K])^1.5*(eps_mac)^1.5 Effective binary diffusivity, H2O_N2 D_effO2_H2O 0.282e-4[m^2/s]*(T/308.1[K])^1.5*(eps_mac)^1.5 Effective binary diffusivity, O2_H2O wH2_in 0.1 Inlet weight fraction H2 wO2_in 0.21*0.8 Inlet weight fraction O2 wH2Oc_in 0.2 Cathode inelt weight fraction, H2O MH2 2[g/mol] Molar mass, H2 MO2 32[g/mol] Molar mass, O2 MH2O 18[g/mol] Molar mass, H2O MN2 28[g/mol] Molar mass, N2 xH2_in (wH2_in/MH2)/(wH2_in/MH2+(1-wH2_in)/MH2O) Inlet molar fraction, H2 KH2 3.9e4[Pa*m^3/mol] Henry's law constant, H2 in agglomerate KO2 3.2e4[Pa*m^3/mol] Henry's law constant, O2 in agglomerate cH2_ref xH2_in*p_ref/KH2 Reference concentration, H2 cO2_ref xO2_in*p_ref/KO2 l_act 10[um] Active layer thickness xO2_in (wO2_in/MO2)/(wO2_in/MO2+wH2Oc_in/MH2O+(1-wO2_in-wH2Oc_in)/MN2) Inlet molar fraction, O2 K -6*l_act*(1-eps_mac)*F_const*D_agg/R_agg^2 Agglomerate current density subexpression