Influence of pulsive pressure waves on liquid penetration into wood in semi-opened container

Soichi Tanaka,Tsunehisa Miki,Masako Seki,Kenji Umemura,Kozo Kanayama

doi:10.1186/s10086-019-1832-2

Soichi Tanaka, Tsunehisa Miki + Show 3 more

Open Access

https://doi.org/10.1186/s10086-019-1832-2

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Abstract

The purpose of this paper was to confirm the influence of pulsive pressure waves on the liquid penetration into wood in the semi-opened container. Wood block sample was irradiated by the pulsive pressure waves in the semi-opened container filled with water used as a liquid. The irradiation was also performed in the closed container for the comparison. The water penetration into the sample was promoted by the pressure-wave irradiation. There was little difference in the degree of the penetration between the closed and the semi-opened containers. It was presumed from the measured hydraulic pressure that the pressure-wave energy irradiated on the sample in the closed container was higher than that in the semi-opened container. It was also presumed that the cavitation generation was promoted in the semi-opened container. This indicates that the cavitation as well as the pressure waves themselves affected the liquid penetration into wood. The compressive deformation of the sample irradiated in the semi-opened container was slightly smaller than that in the closed container. This indicates that the pulsive pressure-wave irradiation in the semi-opened container promoted the liquid penetration into wood with less compressive deformation.

Highlights

Impregnation of wood with liquid is one of the most important techniques to improve its disadvantages and to add new properties to it
The purpose of this paper was to confirm the influence of the pulsive pressure waves on the liquid penetration into wood in the semi-opened container
It was presumed that the cavitation bubbles were not formed in the closed container. These findings indicate that the cavitation promoted the liquid penetration into wood

Summary

Introduction

Impregnation of wood with liquid is one of the most important techniques to improve its disadvantages and to add new properties to it. The most popular impregnation is the pressure process, which is composed of immersing wood in the liquid under vacuumed pressure, exposing the liquid to an atmospheric pressure, and often placing it under pressurized pressure. In this process, the liquid penetrates wood mainly due to the liquid flow driven by higher hydraulic pressure at the wood surface than that at the tip of the penetration inside wood. The flow of the liquid is often disturbed by the discontinuous flow paths, which causes the unpenetrated areas remained in wood. The treatment for decreasing the discontinuity by breaking the closed tissues has been studied in biological (for example, [2]), chemical (for example, [3]), or physical way (for example, [4])

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