On the fluid permeability of heat treated paulownia wood

Abstract

Fibre direction cylindrical specimens from the sapwood and heartwood areas of Paulownia wood were heat treated at 180, 190, and 200°C split in eight groups of ten specimens each. Air and water permeability were measured, thereafter. Results demonstrated that heat treatment had a positive effect on air permeability both in sapwood and heartwood specimens. That increase might be attributed to the development of cell wall micro-checks caused by thermal degradation and fracture of the vessel tyloses. Liquid permeability was significantly decreased as a result of heat treatment.

Delignification Effects on Indonesian Momala (Homalium foetidum) and Korean Red Toon (Toona sinensis) Hardwood Pore Structure and Sound Absorption Capabilities

“…Tyloses-blind or closed pores-inside wood vessels most hinder its longitudinal permeability [14,[19][20][21][22]. In order to eliminate these obstacles, various methods, such as heat treatment, microwave treatment, ultrasonic treatment, steam explosion treatment, and delignification treatment, have been studied [8,[23][24][25][26].…”

An experimental study on change of gas permeability depending on pore structures in three species (hinoki, Douglas fir, and hemlock) of softwood

“…In recent research, permeability of wood is recognized as an important parameter in various applications such as heat-treated wood [3][4][5], nanomaterial impregnation [6][7][8] and use of the transverse surface of wood as a porous sound-absorbing material [9][10][11] Applying an appropriate drying schedule can improve the permeability of wood [12,13]. Impregnation of aqueous metal nanoparticles into heat-treated solid woods can improve its permeability because some of the wood's extractives dissolve, producing perforations and pits [14].…”

Fluid Flow in Nanosilver-Impregnated Heat-Treated Beech Wood in Different Mediums

“…The mean value of specific longitudinal gas permeability of all specimens was measured to be 6.48 (× 10 −13 m 3 m −1 ) (Figures 2 and 3). Previous studies showed that variability of permeability is very high in solid wood species [8,9,17,18]. In some cases, difference in permeability of two specimens from the same tree, and even the same board or log, would be as high as five times.…”

“…Figure 1. Schematic representation of the gas permeability apparatus equipped with single-story milli-second precision electronic time measurement device [8,16,17,19].…”