
281Flame Impingement
Table 12.20 shows sample calculations, using the vari-
ous methods, for the thermal conductivity of the com-
bustion products.
72
12.4.1.2 Stagnation Velocity Gradient
The original semianalytic heat transfer solution was devel-
oped for uniform external ows, impinging normal to a
body of revolution.
44
The momentum equation for steady
ow in the boundary layer along the surface of an axisym-
metric body and near the forward stagnation point,
73
is
v
x
v
y
x
y
x
x
y
∂
∂
βν
∂
+=+
2
2
(12.5)
As shown in Figure 12.23, x is the distance from the
stagnation point, along the body, and y is the distance
normal from the surface. From potentia