科研之友
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摘要
In this study, in order to acquire the quantitative distribution of wood moisture in a hygroscopic environment, Pinus yunnanensis was taken as the research target. In consideration of the phase equilibrium relationship among vapor and bonded water, unstable diffusivities of vapor and bonded water, and the relationship between the equilibrium moisture content of wood and surrounding moisture content, a model of one-dimensional isothermal moisture migration in wood was established beneath the fiber saturation point. Comparative analyses were then carried out on the model solution and experimental measurement results. It was found that the model could accurately predict the process of moisture migration in the wood in each hygroscopic range beneath the fiber saturation point, and the diffusivities of bonded-water Dls and vapor Dvs increased with greater moisture content (MC) of wood, but they could be regarded as constant within a certain MC range. The larger the gap change range between the initial wood MC and surrounding equilibrium MC was, the greater the MC gradient of the wood interlayer would be, and the shorter the overall EMC time would be. Environment boundary was selected as the actual EMC of wood under the corresponding ERH.
