One- and Two-Dimensional Moisture Profiles in Red Oak
Keywords:
Moisture gradients, moisture profiles, drying, red oakAbstract
Differential moisture losses during the early stages of drying are critical to the development of stresses that result in checking and associated degrade. This research was conducted to determine the shape of the moisture profiles in flat sawn red oak (Quercus sp.) under several different conditions early in drying. In addition, both one- and two-dimensional profiles were compared graphically and statistically to determine if moisture loss from the narrow (nearly radial) surfaces was significant. The results indicate that the moisture profiles are continuous and nearly parabolic after one day of drying under mild or severe conditions. The one- and two-dimensional profiles were essentially the same when compared both graphically and statistically, which indicates that moisture losses from the narrow faces can be neglected when developing drying models for flat sawn red oak having a width at least four times its thickness.References
Bai, G. L., and Garrahan, P. 1984. The temperature and moisture content in lumber during preheating and drying. Wood Sci. Technol. 18(2):121-135.nBois, P. J. 1977. The four stages of drying thick oak. FPRS News Digest, File Number J-1.3. Forest Products Research Society, Madison, WI.nHann, R. A. 1964. Drying yellow-poplar at temperatures above 100 C. Forest Prod. J. (14)5:215-220.nHawley, L. F. 1931. Wood liquid relations. U.S.D.A. Bull. No. 248. Washington, D.C.nKmenta, J. 1971. Principles of econometrics. MacMillen Co., New York. 655 pp.nMcMillen, J. 1955. Drying stresses in red oak. Forest Prod. J. 5(1):71-76.nMcMillen, J. 1956. Drying stresses in red oak—Effect of temperatures. Forest Prod. J. 5(8):230-241.nSiau, J. 1984. Transport processes in wood. Springer-Verlag, New York. 255 pp.nSimpson, W. T. 1973. Relation of comparative diffusion rates of oak ray and surrounding tissue to check formation. Wood Fiber 5(1):34-40.nSimpson, W. T. 1976. Effect of presteaming on moisture gradient on northern red oak during drying. Wood Science 8(4):272-276.nStamm, A. J. 1946. Passage of liquids, vapors, and dissolved materials through softwoods. U.S. Dept. of Agric. Tech. Bull. No. 929. Washington, D.C.nStevens, R. 1972. Moisture movement above the fiber saturation point in loblolly pine sapwood. Ph.D. thesis, State University of New York, Syracuse.n
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