Fire burns in three dimensional space, with flames attaching to inclined surfaces leading to a number of observed behaviors. Flames from a fire burning in a channel inclined at 10° above the horizontal will behave in a manner similar to:
Flames attach to upward-facing burning surfaces inclined
more than 15° from horizontal, making flame spread and heat
flow along the incline much more like that on a vertical surface
than on a horizontal one.
If the upward-facing burning surface
is inclined less than 15°, flames are detached and much thicker,
with the appearance and high heat transfer rates typical of pool
fire flames.
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