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. 2025 Jun 20;27(7):659. doi: 10.3390/e27070659
Dij Mass diffusion coefficient (m2 s−1)
Di,eff Effective mass diffusion coefficient (m2 s−1)
h Specific enthalpy (J kg−1)
j Current density (A m−2)
j0 Exchange current density (A m−2)
Ji Diffusive flux of species j (kg m−2s−1)
keff Thermal effective conductivity (W m−1 K−1)
Mi Molecular weight of the species i (kg mol−1)
ne Number of electrons (-)
P Pressure (Pa)
R Universal gas constant (W mol−1 K−1)
Se Energy source term (W m−3 s−1)
Si Species source term (kg m−3 s−1)
sμ Fluid friction entropy generation rate (W K−1 m−3)
sh Heat transfer entropy generation rate (W K−1 m−3)
sm Mass transfer entropy generation rate (W K−1 m−3)
sohm Chemical reaction entropy generation rate (W K−1 m−3)
T Temperature (K)
t Time (s)
v Velocity (m s−1)
V Voltage (V)
V0 Standard electric potential (V)
Xi Molar fraction of species i (-)
Greek symbols
nact Activation potential (V)
nohm Ohmic loss (V)
nconc Concentration loss (V)
µ Viscosity (m s−2)
σ Electrical conductivity (Ω−1 m−1)
ϯ Tortuosity (-)
ωi Mass fraction of species i (-)
Electrical potential (V)