Experiments on Nonisothermal Moisture Movement in Wood

John F. Siau, Marian Babiak


Four experiments were conducted to measure the flux of water vapor through white pine wood transverse to the grain with an applied thermal gradient of 7 C/cm. The results were compared with a theoretical equation based on activation theory, in which both moisture-content and thermal gradients are taken into account. A reasonable agreement was found between the experimental and theoretical fluxes. The results could not be explained either on the basis of a moisture-content or partial-pressure gradient taken separately.


Moisture movement;diffusion;activation energy

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