NDLI: Liquid water diffusivity of wood from the capillary pressure-moisture relation

Content Provider	Springer Nature Link
Author	Kang, Wook Chung, Woo Yang
Copyright Year	2009
Abstract	This study focuses on liquid water transport in wood above the fiber saturation point in the nonhygroscopic region. The liquid water transport of hygroscopic porous materials including wood is usually described by Darcy’s law. It requires knowledge of capillarity and intrinsic and relative permeabilities. In this study, the capillary pressure-water relation and relative permeability were investigated using experimental data for wood available in the literature. The performance of three models (Brooks-Corey model, van Genuchten model, and Durner’s bimodal pore-size distribution model) was investigated for the capillary pressure-water relation. These models have advantages in that each shape parameter has qualitative physical meaning for the pore-size distribution. Most species had unimodal pore distributions except for aspen, which had a bimodal pore distribution. The van Genuchten model represented the capillary pressure-water relation better than the Brooks-Corey model. Durner’s bimodal model was found to be the most appropriate for the capillary pressure-moisture relation of aspen. The relative permeability was calculated by using Mualem’s model, which was compared with the value from the Couture model. From the results, the liquid water diffusivity divided by intrinsic permeability of wood was estimated. This approach may be promising for adopting the liquid water diffusivity for the numerical simulation of drying and sorption, although there might be considerable variation within and between trees.
Starting Page	91
Ending Page	99
Page Count	9
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	55
Issue Number	2
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2009-02-03
Publisher Place	Japan
Access Restriction	Subscribed
Subject Keyword	Liquid water transport Capillary pressure Permeability Wood Nonlinear fitting Characterization and Evaluation of Materials Materials Science Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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