
500 Oxygen-Enhanced Combustion
Assuming that the ame shape is cylindrical, gives
the following estimate of the ame volume:
l
F
=
2
(20.8)
where l
F
and d
F
is the ame length and the ame diam-
eter or lateral dimension, respectively.
Consequently, total heat transferred from the ame to
the slab can be expressed as
Q
ATTBTT
C
V
d
net
FS WS
F
F
=
⋅−
+⋅⋅−
σσ
44 44
4
(20.9)
From this equation, it can be seen that the heat transfer
from the ame to the heat sink can be considered as two
parts: one comes from the ame directly to the heat sink
and another comes from the wall to the heat sink, which
is indirectly from the ame via absorption and reec ...