Departmental Bulletin Paper A Mathematical Model of the Moisture Gradient in Air–Dried Square Heavy Timbers of Japanese Red Pine

Kang, Chun-Won  ,  Lee, Yong Hun  ,  Kang, Ho-Yang  ,  Kang, Seog-Goo  ,  Shin, Ik-Hyun  ,  Fujimoto, Noboru

60 ( 2 )  , pp.445 - 450 , 2015-09-18 , Faculty of Agriculture, Kyushu University
ISSN:0023-6152
NCID:AA00697606
Description
Moisture content variation along the thickness direction of square heavy timbers of Japanese red pine (20 × 20–cm cross–section, 360 cm length) of a control and those kerfed in the longitudinal direction were mathematically simulated during air drying. The model was based on anatomical features, and the heat and mass transfer of the wood. The model was solved numerically in order to predict the moisture content profiles. Then, the estimated moisture content variation was compared to that of the experimental value of the square heavy timbers. The square heavy timbers were dried to a moisture content of 14% for the kerfed and 15% for the control wood. The final moisture content differences between the internal and external layers of the kerfed and control wood specimens were 2% and 2.5%, respectively. The moisture gradient in the thickness direction was very smooth. The moisture content variance in the thickness direction with kerfing was almost same to that of the control. The mathematically estimated moisture gradient was in good agreement with the experimentally evaluated values.
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http://catalog.lib.kyushu-u.ac.jp/handle/2324/1543407/p445.pdf

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