For purposes of numerical modelling of hygrothermal processes, it is necessary to have all important material properties. Regarding wood and its specific structure, it is usually more complicated to get a suitable value compared to the other building materials, especially in terms of moisture behaviour. One of those is the transfer coefficient for liquid water Dws. To obtain this value, it is necessary to know the absorption coefficient Acap.
Evaluating the absorption coefficient for scotch pine has been used by Sedighi-Gilani et al. 2014. For spruce wood, the water absorption coefficient has been measured in a dissertation by W. Zillig (2009).
This work deals with the measurement of water capillary uptake of spruce wood in three principal directions – radial, tangential and axial. The computational models based on this experiment can be used e.g. for predicting the moisture content of wood exposed to rain in varying climatic conditions.
Keywords: numerical modelling, absorption coefficient, capillary uptake
Authors
Petra Schůtová
CTU in Prague, Prague
Jan Richter
Kamil Staněk
Jan Tywoniak
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