Theoretical Equilibrium Moisture Content of Wood Under Vacuum

Authors

  • Zhangjing Chen
  • Fred M. Lamb

Keywords:

Equilibrium moisture content, vacuum drying

Abstract

Under vacuum drying, there is an equilibrium moisture content corresponding to the vacuum drying conditions, that is, temperature and pressure. Theoretical methods to calculate equilibrium moisture content were developed based on the Hailwood-Horobin sorption theory. The equilibrium moisture contents at pressures from 5 to 760 mm Hg and temperatures from 0 to 100°C were calculated and tabulated in this paper. These equilibrium moisture contents can serve as an aid in the vacuum drying control.

References

Chen, Z. 1997. Primary driving force in wood vacuum drying. Ph.D. dissertation, Virginia Tech., Blacksburg, VA. http://scholar.lib.vt.edu/theses/available/ed-02198-185538'>http://scholar.lib.vt.edu/theses/available/ed-02198-185538nForest Products Laboratory. 1990. Wood engineering handbook. Prentice Hall, Englewood Cliffs, NJ. 438 pp.nHailwood, A. J., and S. Horrobin. 1946. Absorption of water by polymers: Analysis in terms of a simple model. Trans. Faraday Soc.42B:84-92, 94-102.nSiau, J. F. 1984. Transport process in wood. Springer-Verlag, New York, NY. 218 pp.nSimpson, W. T. 1971. Equilibrium moisture content prediction for wood. Forest Prod. J.21(5):48-49.nSimpson, W. T. 1973. Predicting equilibrium moisture content of wood by mathematical models. Wood Fiber Sci.5(1):41-49.nSimpson, W. T. 1998. Equilibrium moisture content of wood in outdoor locations in the United States and worldwide. Research Note FPL-RN-0628, USDA Forest Products Laboratory, Madison, WI. 11 pp.nVoigt, H., O. U. Krischer, and H. Schauss. 1940. Special technique for wood drying. Holz Roh-Werkst. 11(9):364-375.n

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Published

2007-06-05

Issue

Number 4 / October 2002

Section

Research Contributions

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