Drying of sapwood analyzed as an invasion percolation process
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Universidad del Bío Bío
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The sapwood fibers in green softwood are normally filled or nearly filled with free water. Thiswater forms a continuous phase through the narrow bordered pits between fiber lumens. In a dryingprocess water evaporates from the menisci formed at these narrow throats and initially located close tothe surface of the wood. As the amount of free water decreases in this way, a retraction of the meniscuswill happen in the widest throat, which can be located anywhere, not necessarily close to the surface.As the individual size of these narrow throats is a stochastic variable, this process will producecomplicated water phase structures that gradually fragmentize. If this drying behavior is viewed assuch an invasion percolation process it is obvious that the result differs from normal diffusion, whichhowever most often is used as the basis for wood drying modeling.A computer based simulation model that utilizes the above principle has been developed. This modelhas been used for the simulation of a few situations of practical and theoretical importance. It has beenfound that this invasion percolation approach can reproduce some previously unexplained featuresseen in softwood drying processes. Some detailed examples are presented in this paper.
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