Influence of Mean Free Path on Gas Flow in Wood

Authors

  • J. A. Petty

Keywords:

Softwoods, gas permeability, slip flow, mean free path, tracheids, bordered pits

Abstract

It is shown theoretically that the existence of more than one structural component in the flow path through wood causes the gradient of a graph of superficial gas permeability against reciprocal mean pressure not to be directly proportional to the mean free path of the gas. This is unlike the behaviour of homogeneous media and agrees with previously published experimental data.

References

Bolton, A. J., and J. A. Petty. 1975. Structural components influencing the permeability of ponded and unponded Sitka spruce. J. Microscopy104(1):33-46.nCarman, P. C. 1956. Flow of gases through porous media. Butterworth's Scientific Publications. London.nComstock, G. L. 1967. Longitudinal permeability of wood to gases and nonswelling liquids. For. Prod. J.17 (10):41-46.nKlinkenberg, L. J. 1941. The permeability of porous media to liquids and gases. Drill. Prod. Pract. Pp. 200-213.nPetty, J. A. 1970. Permeability and structure of the wood of Sitka spruce. Proc. Roy. Soc. Lond.B 175:149-166.nPetty, J. A. 1974. Laminar flow of fluids through short capillaries in conifer wood. Wood Sci. Technol.8:275-282.nPetty, J. A., and G. S. Puritch. 1970. The effects of drying on the structure and permeability of the wood of Abies grandis.Wood Sci. Technol.4:140-154.nSiau, J. F. 1976. A model for unsteady-state gas flow in the longitudinal direction of wood. Wood Sci. Technol.10:149-153.nSmith, D. N. R., and W. B. Banks. 1971. The mechanism of flow of gases through coniferous wood. Proc. Roy. Soc. Lond.B 177:197-223.nWiley, A. T., and E. T. Choong. 1975. Some aspects of non-Darcy behaviour of gas flow in wood. Wood Fiber6(4):298-304.n

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Published

2007-06-05

Issue

Number 3 / Fall 1976

Section

Research Contributions

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