kaseyvn03
13.10.2021 •
Engineering
A long cylindrical wood log (k = 0.17 W/m⋅K and α = 1.28×10−7 m2/s) is 10 cm in diameter and is initially at a uniform temperature of 27°C. It is exposed to hot gases at 455°C in a fireplace with a heat transfer coefficient of 13.6 W/m2⋅K on the surface. If the ignition temperature of the wood is 375°C, determine how long it will be before the log ignites. Solve this problem using the analytical one-term approximation method.
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Ответ:
Resolving Power=625000
Explanation:
See attached picture.