Summary
Two equations are derived to describe the nonisothermal unsteady-state diffusion of moisture in one direction in parallel-sided bodies. One equation is based upon a gradient of activated moisture molecules and the other on a gradient of chemical potential.
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References
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Siau, J.F. A proposed theory for nonisothermal unsteady-state transport of moisture in wood. Wood Sci. Technol. 17, 75–77 (1983). https://doi.org/10.1007/BF00351834
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DOI: https://doi.org/10.1007/BF00351834