Effect of Hardwood Vessels on Longitudinal Moisture Diffusion
Keywords:Moisture diffusion, hardwood vessels, sorption isotherm, red oak, American elm, sweet-gum
AbstractThe hypothesis that the longitudinal moisture content profile follows the shape of the sorption isotherm under steady-state diffusion condition was confirmed. This phenomenon was explained in terms of the unrestricted flow of water vapor from the lumen of one vessel element to the lumen of the next vessel element. Despite the assumed high vapor transport efficiency of the vessels, other cell types were believed to contribute substantially to longitudinal moisture movement. The diffusion coefficients of three different hardwood species were found to vary with moisture content.
Bramhall, G. 1979. Sorption diffusion in wood. Wood Science12(1):3-13.nChoong, E. T., Y. Chen, J. D. Mamit, J. Llic, and W. R. Smith. 1994. Moisture transport properties in hardwoods. Proc. 4th IUFRO International Wood Drying Conference, Rotorua, New Zealand, pp. 87-94.nKoch, P. 1985. Utilization of hardwoods growing on southern pine sites. Vol. USDA, Forest Serv. Agriculture Handbook No. 605. U.S. Government Printing Office, Washington, DC. pp. 303.nPanshin, A. J., and C. De Zeeuw. 1980. Textbook of wood technology. 4th McGraw-Hill, New York, NY.nSiau, J. F. 1995. Wood: Influence of moisture on physical properties. Virginia Polytechnic Institute and State University, Blacksburg, VA.nSimpson, W. T. 1971. Equilibrium moisture content prediction for wood. Forest Prod. J.21(5):48-49.nSkaar, C. 1988. Wood-water relations. Springer-Verlag, Berlin, New York.nU.S. Forest Products Laboratory. 1999. Wood Handbook: Wood as an engineering material. General Technical Report FPL-GTR-113. USDA, Forest Serv., Forest Prod. Lab., Madison, WI.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.