Page 315 - High Temperature Solid Oxide Fuel Cells Fundamentals, Design and Applications

Chapter 1'11

Cell, Stack and System Modelling

Mohammad A. Khaleel and J. Robert Selman

list of terms

mass fraction of species i
Ci
specific heat
CP
'&.electrode reactant concentration at electrode
reactant concentration at gas channel
Cr,bulk
product concentration at electrode
Cpelectrode
product concentration at gas channel
Cp.bulk
a half-thickness of the plate
hydraulic diameter
Dh
Dij, D02-N2, binary diffusion coefficients
DH2-H20
Dim multicomponent diffusion coefficient of species i in a
mixture
anode effective diffusion coefficients
cathode effective diffusion coefficients
rate of mole change of species y (y = Hz, 02, H20, CO,
COz, CH4)
drf f dt rate of change due to forward reaction
dr,/dt rate of change due to backward reaction
E Young's modulus
E,, or E" the equilibrium (open circuit) voltage
activation energy
EH2
Etotal total energy (delivered per unit time)
Ek turbulent kinetic energy
F Faraday constant
g acceleration due to gravity
AGO standard free-energy change of a reaction (eq.8a)
standard Gibbs free-energy change of the shift reaction
heat transfer coefficient