Drying Rates of Heartwood Below Fiber Saturation

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Numerical solutions of the time-dependent diffusion equation were used to evaluate the influence of species and size on drying rates of heartwood of six tree species--four of them common forest fuels and two representing extremes of microstructures in heartwood. Cylindrical symmetry with constant boundary conditions was assumed, so that the diffusion reduced to a one-dimensional case. Results indicate that the drying rate is not purely an exponential decay. The ratio of response time of the fuels to the radius squared is nearly constant for a given species at any given power of 1/e. Moisture profiles within the fuel show orderly collapse of gradient for all cases when scaled by the radius and response time. Forest Sci. 16:57-63.

Keywords: Forest fuels; forest fire hazard; lumber seasoning

Document Type: Journal Article

Affiliations: Meteorologist, Rocky Mountain Forest and Range Exp. Sta., Forest Serv., U.S.D.A., Headquarters at Fort Collins, Colorado, maintained in cooperation with Colorado State University

Publication date: March 1, 1970

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