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

Content Provider	Springer Nature Link
Author	Kang, Wook Chung, Woo Yang Eom, Chang Deuk Yeo, Hwanmyeong
Copyright Year	2008
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.
Starting Page	267
Ending Page	277
Page Count	11
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	54
Issue Number	4
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2008-05-07
Publisher Place	Japan
Access Restriction	Subscribed
Subject Keyword	Nonisothermal transport model Drying Building physics Phenomenological coefficients Sorption isotherm Characterization and Evaluation of Materials Materials Science Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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