Moisture content-water potential relationship of red pine sapwood above the fiber saturation point and determination of the effective pore size distribution |
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| Authors: | Carl Tremblay Alain Cloutier Yves Fortin |
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| Institution: | (1) Département des sciences du bois et de la forêt Faculté de foresterie et géomatique, Université Laval, G1K 7P4 Québec, Qc, Canada |
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| Abstract: | Summary The pressure membrane and pressure plate techniques were used to establish the moisture content-water potential (M- ) relationship of red pine (Pinus resinosa Ait.) sapwood in desorption above the fiber saturation point. The moisture content-water potential relationship is required for the development of a model of drying considering the gradient of water potential as the driving force of moisture in wood. This relationship was established at 18, 56 and 85 °C for radial desorption. The results obtained demonstrate that water potential increases with temperature T at a given moisture content M. There is no significant variation of  /T with temperature. Also, there is no plateau at intermediate moisture contents as was the case for the M- relationship of aspen sapwood established in a previous work. The effective integral and differential pore size distributions inferred from the M- relationship are also presented. The largest proportion of effective pore openings was found for a radius of 0.2  m. This value can be related to the pit membrane openings of red pine.This research project is currently supported by the Natural Sciences and Engineering Research Council of Canada under grant no. OGP0121954 |
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