
84 Fuel Cells
The gas constant of the mixture is
R
R
M
mix
kj/k
==
8 3144
10 7327
0 7746
.
.
.
.
The constant pressure specic heat of the mixture is
CxC
xC xC xC
i
i
PP
HP CO PHOP
mix
HC
O
=
=× +× +×
=
2
2
2
2
2
2
0.11465 14 209 0 8199 0 842 0 0335 1 872
2 0816 0
×+×+ ×
=+
.. .. .
....
.
69035 0 0627
2 835
+
=⋅kJ kg K./
Heat transfer to cool the mixture
12 21 21
12
2 835 500 100
1134
qhhC TT
q
=−=−=×−
=
P
mix
().( )
kkJ/kg.
3.11.3 Transport Properties of Gas Mixture
Transport properties such as viscosity and thermal conductivity of a gas
mixture are estimated based on the mixture rules. A simplied mixture
model developed based on the kinetic theory model is widely used (Bird et. ...