
40 Oxygen-Enhanced Combustion
The gas properties are needed to calculate the Nusselt,
Prandtl, and Reynolds numbers as will be shown next.
2.5.1 Density
The gas density (ρ) may be used to calculate the
Reynolds number (Re = ρvd/μ), which is usually needed
to compute the convective heat transfer coefcient (h),
which is discussed in the next chapter. The density is
also used to calculate the average gas velocity through
the combustor, which is also usually needed to compute
the convection coefcient:
v
=
ρ
(2.14)
where
m
˙
is the mass ow rate of gases (which is known and
equal to the sum of the incoming fuel + oxidizer
ow rates)
A is the cross