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Some considerations in heterogeneous nonisothermal transport models for wood: a numerical study

Cited 8 time in Web of Science Cited 8 time in Scopus
Authors
Kang, Wook; Chung, Woo Yang; Eom, Chang-Deuk; Yeo, Hwanmyeong
Issue Date
2008-08
Publisher
SPRINGER
Citation
JOURNAL OF WOOD SCIENCE Vol.54 pp. 267-277
Keywords
복합학Nonisothermal transport modelDryingBuilding
physics
Phenomenological coeffi cientsSorption
isotherm
Abstract
This study compares a number of coupled heat and mass transfer models and presents numerical comparisons of phenomenological coefficients between the four models (Stanish, Perre, Pang, and Avramidis) that are most frequently used in the literature to describe wood-drying processes. The USDA sorption isotherm, the Hailwood-Horrobin model, was adopted to calculate the relations between moisture content in wood and water vapor pressure at any temperature. Due to different assumptions about the driving forces of heat and mass transfer, coefficients in each model represent different values for moisture content and temperature and are closely related to each other. In the case of isothermal mass transfer, the moisture diffusion coefficient in the transverse directions from the Stanish and Pang models increased with decreasing moisture content. This contradicts the Avramidis and Perre models and numerous experimental results. Thermal diffusion effects on the drying process may not be predominant because the nonisothermal state is relatively short. Therefore, the Perre model, which does not consider the thermal diffusion effect, has been used successfully in the drying simulation. However, it may be erroneous in certain cases when the nonisothermal state prevails over the system, such as building physics. The Pang model cannot explain the phenomena of thermal diffusion and moisture thermodiffusion. It might be reasonable to modify the thermal diffusion of the Avramidis model, which is lower than that of the Stanish model. The apparent heat diffusivity was higher than the true heat diffusivity.
ISSN
1435-0211
Language
English
URI
http://hdl.handle.net/10371/81944
DOI
https://doi.org/10.1007/s10086-007-0938-0
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Forest Sciences (산림과학부)Journal Papers (저널논문_산림과학부)
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