KINETICS AND MODELLING OF WATER ABSORPTION PROCESSES IN DIFFERENT TREE SPECIES
Keywords:
wood; water absorption; saturation kinetics; parameter sensitivity analysis; mathematical model.Abstract
A novel two-stage kinetic model for simulating water absorption in wood is presented, explicitly accounting for simultaneous absorption and evaporation in the longitudinal direction and addressing limitations of prior models focused primarily on drying or radial sorption. Water absorption was investigated by partial immersion of samples from three tree species – paulownia (Paulownia in vitro), alder (Alnus glutinosa), and pine (Pinus sylvestris). A computational experiment was conducted using parameter sensitivity analysis of the developed mathematical model. The model demonstrates high fidelity in describing sorption kinetics, with correlation coefficients reaching 85% for absorption (logarithmic dependence) and over 90% for dehydration (exponential reliance). At 20 °C, the paulownia absorption rate exceeded alder by 8% and pine by 23%. These findings enhance understanding of moisture transport mechanisms and offer practical insights for optimizing impregnation processes in wood processing.
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