An approach to the numerical simulation of wood drying based on the finite element method is presented. Wood, as a hygroscopic, strongly anisotropic porous material, must be dried before being used for a practical purpose. Wood drying leads to a combination of vapor, bound water, and free water movement. A numerical simulation of the drying process of wood involves three fundamental phenomena: heat transfer, movement of moisture, and mechanical deformation. Liquid flow due to capillarity, water vapor and air (diffusing and convection in bulk gas flow), and bound liquid diffusion are basic mechanisms of mass transfer in wood. The aim of the paper is to present a numerical model of coupled heat, moisture and air transfer in pores of wood subjected to high temperature drying conditions. Heat and moisture exchange take place between wood and drying medium, and coupled problems can be described from a macroscopic viewpoint of continuum mechanics. Benchmark tests of a 3-D model under Dirichlet and mixed type of boundary conditions are used to account for the coupling among temperature, moisture content and gas pressure.
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References
Fyhr C., Rasmuson A. (1997). Some aspects of the modelling of wood chips drying in superheated steam. International Journal of Heat and Mass Transfer, 40(12), 2825–2842.
Kocaefe D., Younsi R., Chaudry B., Kocaefe Y. (2006). Modeling of heat and mass transfer during high temperature treatment of aspen. Wood Science and Technology, 40, 371–391.
Pang S. (1996). Moisture content gradient in a softwood board during drying: Simulation from a 2-d model and measurement. Wood Science and Technology, 30, 165–178.
Simpson W. T., Liu J. Y. (1997). An optimization technique to determine red oak surface and internal moisture transfer coefficients during drying. Wood Fiber Sci., 29(4), 312–318.
Thomas H. R., Morgan K., Lewis R. W. (1980). A fully nonlinear analysis of heat and mass transfer problems in porous bodies. International Journal for Numerical Methods in Engineering, 15, 1381–1393.
Tremblay C., Cloutier A., Grandjean B. (1999). Experimental determination of the ratio of vapor diffusion to the total water movement in wood during drying. Wood Fiber Sci., 31(3), 235–248.
Turner I. W. (1996). A two-dimensional orthotropic model for simulating wood drying processes. Applied Mathematical Modelling, 20(1), 60–81.
Wadso L. (1994). Describing non-fickian water-vapour sorption in wood. Journal of Materials Science, 29, 2367–2372.
Younsi R., Kocaefe D., Kocaefe Y. (2006). Three-dimensional simulation of heat and moisture transfer in wood. Applied Thermal Engineering, 26, 1274–1285.
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Zhu, Z., Kaliske, M. (2009). Transient Simulation of Coupled Heat, Moisture and Air Distribution in Wood during Drying. In: Yuan, Y., Cui, J., Mang, H.A. (eds) Computational Structural Engineering. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2822-8_67
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DOI: https://doi.org/10.1007/978-90-481-2822-8_67
Publisher Name: Springer, Dordrecht
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