Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): John F. HuntHongmei Gu
    Date: 2004
    Source: 2004 International ANSYS Conference : Pittsburgh, PA, May 24-26, 2004. [S.l. : s.n., 2004]: 13 pages.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.2 MB)

    Description

    The anisotropy of wood creates a complex problem for solving heat and mass transfer problems that require analyses be based on fundamental material properties of the wood structure. Inputting basic orthogonal properties of the wood material alone are not sufficient for accurate modeling because wood is a combination of porous fiber cells that are aligned and mis-aligned in low- and high-density regions called annual rings. Modeling heat transfer requires the development of effective thermal conductivities as a function of those parameters associated with the rings. Effective 2D thermal conductivities were determined by modeling the wood structure at the cellular scale as a function of cell alignment and cell openness or density. Effective heat transfer coefficients were then applied to a macro scale wood board model. This macro-scale model was developed to study the transient heat transfer effects for any specific location, board dimension, and annual ring dimensions located on the cross section of a log. Using ANSYS Parametric Design Language program we were able to easily generate the geometrical specifications and enter the appropriate heat transfer coefficients determined from the micro wood cell model. Traditional initial and convective boundary conditions were applied as if a dry wood board were being heated in a convection oven. These were used to examine the transient heat transfer and temperature rise in the core of the wood board “cut” from various positions in a log. Significant differences in transient core temperature and heat conductive paths were observed for the various board configurations and annual ring geometry.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Hunt, John F.; Gu, Hongmei. 2004. Finite element analyses of two dimensional, anisotropic heat transfer in wood. 2004 International ANSYS Conference : Pittsburgh, PA, May 24-26, 2004. [S.l. : s.n., 2004]: 13 pages.

    Keywords

    Mass transfer, mathematical models, thermal conductivity, heat transmission, anisotropy, finite element method, heat flux, thermal properties, heat conduction, porosity, orientation, wood anatomy, tree-rings, earlywood, latewood

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/27676