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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.
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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: 1970-03-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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