Drying Behavior of Hardwood Components (Sapwood, Heartwood, and Bark) of Red Oak and Yellow-Poplar

Forests

Mohsen Bahmani¹  Sohrab Rahimi²  David DeVallance³  Demiao Chu⁴  Kaushlendra Singh⁵ 

[1] Department of Natural Resources and Earth Science, Shahrekord University, Shahrekord 88, Iran;Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;Faculty of Mathematics, Natural Resources and Information Technology, University of Primorska, 6000 Koper, Slovenia;Key Lab of State Forest and Grassland Administration on Wood Quality Improvement & High Efficiet Utilization”, School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036, China;United States Department of Agriculture—Foreign Agricultural Service, Washington, DC 20250, USA;

关键词: activation energy;    diffusion coefficient;    drying curves;    physical properties;    wood;   

DOI  :  10.3390/f13050722

来源: DOAJ

【 摘 要 】

This paper presents differences in the drying behavior of red oak and yellow-poplar sapwood, heartwood, and bark and their relationship with selected physical characteristics. Drying experiments were performed on samples of sapwood, heartwood, and bark of respective species at 105 °C under nitrogen conditions. In addition, physical characteristics such as green moisture content, specific gravity, volumetric shrinkage, shrinkage of the cell wall, total porosity, pore volume occupied by water, and specific pore volume were calculated. The results showed that the volumetric and cellular shrinkages of sapwood were greater than those of heartwood for both species. For red oak, the specific gravity of sapwood and heartwood was not significantly different. Additionally, the total porosity of heartwood was lower than that of sapwood in red oak. The results also indicated that yellow-poplar dried faster than red oak. Among all three components, bark dried faster than sapwood and heartwood in both species. The activation energy for sapwood drying was less than for heartwood drying.

【 授权许可】

Unknown