V_cell 0.7[V] Cell voltage
T 353[K] Temperature
kappa_s 1000[S/m] Conductivity, solid phase
kappa_p 1e-13[m^2] GDL permeability
tortx 1.1 Tortuosity, x-direction
torty 2.8 Tortuosity, y-direction
p_ref 1[atm] Reference pressure
p_a_in p_ref+25[mbar] Anode inlet pressure
p_c_in p_ref+50[mbar] Cathode inlet pressure
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
eps_mic 0.2 Microscopic porosity inside agglomerates
eps_mac 0.4 Macroscopic porosity between agglomerates
S 1e7[m^2/m^3] Specific surface area, agglomerate
R_agg 0.1[um] Agglomerate radius
l_act 10[um] Active GDE layer thickness
D_agg 1.2e-10[m^2/s]*((1-eps_mac)*eps_mic)^1.5 Effective diffusion coefficient inside agglomerates
K -6*F_const*D_agg/R_agg^2 Agglomerate current density subexpression
Av 3*(1-eps_mac)/R_agg Specific surface area, GDE
xH2Oa_in 0.42 Inlet molar fraction, H2O
xH2_in 1-xH2Oa_in Inlet molar fraction, H2
xH2Oc_in 0.42 Inlet molar fraction, H2O
xO2_in 0.21*(1-xH2Oc_in) Inlet molar fraction, O2
xN2_in 0.79*(1-xH2Oc_in) Inlet molar fraction, N2
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 Reference concentration, O2