
467Simulation Model for Analysis and Design of Fuel Cells
= hydrogen concentration at the anode electrode surface adjacent to
the gas channel at Z = Z
a
h
m,a
= convective mass transfer coefcient in the anode gas channel
11.2.2 Anode Electrode
The mass ux through the anode electrode is given based on Fick’s law of
diffusion as
JD
L
ijHa
eff
H,
,ae
2
=
−
ρ
, (11.27)
where
D
ij
eff
= effective diffusion coefcient of hydrogen in porous anode electrode
L
a
= thickness of anode electrode layer
ρ
a
a
=
= density of hydrogen gas stream
Hydrogen gas consumption at the anode electrode–electrolyte
J
j
H
2
= . (11.28)
Combining Equations 11.26 through ...