Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Finite Difference Evaluation of Moisture Profile in Boxed-heart Large-cross-section Square Timber of Pinus densiflora during High Temperature Drying

  • Kim, Hyunbin (Department of Forest Sciences, Seoul National University) ;
  • Han, Yeonjung (Department of Forest Products, National Institute of Forest Science) ;
  • Park, Yonggun (Department of Forest Sciences, Seoul National University) ;
  • Yang, Sang-Yun (Department of Forest Sciences, Seoul National University) ;
  • Chung, Hyunwoo (Department of Forest Sciences, Seoul National University) ;
  • Eom, Chang-Deuk (Department of Forest Products, National Institute of Forest Science) ;
  • Lee, Hyun-Mi (Department of Forest Products, National Institute of Forest Science) ;
  • Yeo, Hwanmyeong (Department of Forest Sciences, Seoul National University)
  • Received : 2017.10.12
  • Accepted : 2017.10.30
  • Published : 2017.11.25
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Abstract

Predicting the amount and distribution of moisture content within wood allows calculating the various mechanical dynamics of the wood as well as determining the drying time. For boxed-heart wood with a large cross-section, since it is difficult to measure the moisture content of the interior, it is necessary to predict the moisture content distribution. This study predicted the moisture movement in boxed-heart red pine timber, during high temperature drying, by using the three-dimensional finite difference method for the efficient drying process. During drying for 72 h, the predicted and actual moisture content of the tested wood tended to decrease at a similar rate. In contrast, the actual moisture content at 196 and 240 h was lower than predicted because surface checking of the wood occurred from 72 h and excessive water emission was unexpectedly occurred from the checked and splitted surface.

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References

  1. Cai, L., Oliveira, L.C. 2010. Experimental evaluation and modeling of high temperature drying of sub-alpine fir. Wood science and technology 44(2): 243-252. https://doi.org/10.1007/s00226-009-0280-3
  2. da Silva, W.P., da Silva, C.M.D.P., Rodrigues, A.F. 2014. Comparison between two-and three-dimensional diffusion models to describe wood drying at low temperature. European Journal of Wood and Wood Products 72(4): 527-533. https://doi.org/10.1007/s00107-014-0812-x
  3. da Silva, W.P., da Silva, L.D., de Silva, C.M., Nascimento. P.L. 2011. Optimization and simulation of drying processes using diffusion models: application to wood drying using forced air at low temperature. Wood science and technology 45(4): 787-800. https://doi.org/10.1007/s00226-010-0391-x
  4. Eom, Y.G. 2015. Wood Anatomy of Korean Species. Seoul. MEDIA WOOD,.Ltd. Republic of Korea.
  5. Han, Y. 2014. Unsteady state analysis of moisture transfer and drying stress development in red pine wood. Ph.D. Thesis, Seoul National University, Republic of Korea.
  6. Han, Y., Seo, Y., Jung, S., Eom, C. 2016. Prediction of Heat-treatment Time of Black Pine Log Damaged by Pine Wilt Disease. Journal of the Korean Wood Science & Technology 44(3): 370-380. https://doi.org/10.5658/WOOD.2016.44.3.370
  7. Kang, W., Kang, C.W., Chung, W.Y., Eom, C.D., Yeo, H. 2008. The effect of openings on combined bound water and water vapor diffusion in wood. Journal of Wood Science 54(5): 343-348. https://doi.org/10.1007/s10086-008-0965-5
  8. Nadler, K.C., Choong, E.T., Wetzel, D.M. 2007. Mathematical modeling of the diffusion of water in wood during drying. Wood and fiber science 17(3): 404-423.
  9. Salin, J.G. 2006. Modelling of the behaviour of free water in sapwood during drying: Part I. A new percolation approach. Wood Material Science and Engineering 1(1): 4-11. https://doi.org/10.1080/17480270600630927
  10. Schnabel, T., Huber, H., Petutschnigg, A. 2017. Modelling and simulation of deformation behaviour during drying using a concept of linear difference method. Wood Science and Technology 51(3): 463-473.
  11. Siau, J.F. 1995. Wood: Influence of moisture on physical properties. Blacksburg. Virginia Polytechnic Institute and State University, USA.
  12. Soma, T., Suzuki, Y., Inayama, M., Ando, N. 2013. Study of Calculation Method for Timber Drying Time I. Heat and mass transfer model of timber drying process with high temperature. MOKUZAI GAKKAISHI 59(4): 171-178. https://doi.org/10.2488/jwrs.59.171
  13. Stamm, A.J. 1960. Combined bound-water and vapour diffusion into sitka spruce. Forest Products Journal, 1960 10(12): 644-648.
  14. Tiemann. H.D. 1921. Kiln Drying of Lumber. Philadelphia. J.P. Lippincott Coy 4th edn, USA.
  15. Yeo, H., Jung. H. 1994. Distribution Model Based on Computer Simulation for Internal Temperature and Moisture Content in Press Drying of Tree Disks. Journal of the Korean Wood Science & Technology 22(2): 61-70.
  16. Yeo, H., Smith, W.B. 2005. Development of a convective mass transfer coefficient conversion method. Wood and Fiber Science 37(1): 3-13.
  17. Younsi, R., Kocaefe, D., Poncsak, S., Kocaefe, Y. 2006. A Diffusion-based Model for Transient High Temperature Treatment of Wood. Journal of Building Physics 30(2): 113-135. https://doi.org/10.1177/1744259106068055
  18. Younsi, R., Poncsak, S., Kocaefe, D. 2010. Experimental and Numerical Investigation of Heat and Mass Transfer during High-Temperature Thermal Treatment of Wood. Drying Technology 28: 1148-1156. https://doi.org/10.1080/07373937.2010.483049