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Predicting the Burning of Wood Using an Integral Model.

pdf icon Predicting the Burning of Wood Using an Integral Model. (1412 K)
Spearpoint, M. J.; Quintiere, J. G.

Combustion and Flame, Vol. 123, No. 3, 308-325, November 2000.


National Institute of Standards and Technology, Gaithersburg, MD


wood; heat flux; mass loss; temperature; char; pyrolysis; charring; burning rate; surface temperature; penetration; ignition; experiments; equations; temperature profiles; material properties; oxidation; char depth


This paper experimentally and theoretically examines the horizontal burning of four species of wood exposed to incident heat fluxes of 25-75 kW/m2 with their grain oriented either parallel or perpendicular to the incident heat flux. Mass loss, temperatures, and char fractions were measured. A one-dimensional integral model that describes the transient pyrolysis of a semi-infinite charring solid subject to a constant radiant heat flux was developed. The solutions to the integral model for the burning rate were compared with data using analytical short-time and long-time solutions. Reasonable comparative results are shown for mass loss rate, surface temperature, char depth, and effective thermal penetration.