Ignition of Wood ( 2 ) Temperature Distribution in Wood heated by Hot Air

Abstract

Temperature distribution in wood heated by hot air which has constant temperature (150°C-190°C) is measured by the thermocouples and electromagnetic oscillograph or galvanometer.
The conclusion was as follows : (1) Temperature distribution in wood is given approximately as the solution of differential equation, which does not contain the exothermical term by decomposition heat of wood, δθ/δt=k(δ²θ/δx²).
(2) Heat transfer coefficient at the surface is increased gradually with the increase of the fluid temperature.
(3) Before ignition, temperature in wood is decreased as the distance increases from the surface. This fact shows that the breadth of wood has only a slight effect upon the time lag of ignition.