Modelling and Experimental Study of Moisture Transport in Wood, Taking into Account Diffusion and the Accompanying Adsorption of Water Vapour by Cell Walls

Abstract

The paper presents a model of moisture transport in wood taking into account diffusion and the accompanying adsorption of water vapour through the skeleton. A two-parameter form of the source term was proposed, depending on the distance of the current moisture content (MC) from the equilibrium state. The tests on cubic samples with a side of 2 cm were carried out which allowed to determine the coefficients of the proposed model on the basis of the reverse method. The tests were performed for pine, larch, oak and ash in all directions of orthotropy. Tests on thin samples were also performed to verify the source term.

Enhancing understanding of moisture diffusion in wood: numerical approach and diffusion parameter optimization

“…0 D  is the diffusion coefficient in the anhydrous state of the material (m 2 /s), and k  is a non-linearity parameter [12]. The diffusion coefficient value showed a notable disparity between the longitudinal and transversal directions [13], [14].…”

“…Kucharczyk A. et al [14], Nguyen et al [19], Simpson W. T. et al [20] has constructed a model using the finite difference method to simulate the one-dimensional moisture diffusion in wood. This computational approach has been validated through comparisons with analytic method and finite element method [19], [21].…”