caa a22 4500 463216849 CHVBK 20180405153159.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s00226-006-0123-4 doi (NATIONALLICENCE)springer-10.1007/s00226-006-0123-4 Shi Sheldon Forest Products Department, Mississippi State University, Box 9820, 39762, Mississippi State, MS, USA aut Diffusion model based on Fick's second law for the moisture absorption process in wood fiber-based composites: is it suitable or not? [Elektronische Daten] [Sheldon Shi] The diffusion model based on Fick's second law was applied to the moisture absorption process in wood fiber-based composites. The data of moisture absorption process on wood fiberboard and wood fiber/polymer composites with different densities were analyzed using the diffusion model. Specimens were subjected to different relative humidities and temperatures. The diffusion coefficients (D) and surface emission coefficients (S) along the thickness direction were calculated by the unsteady-state method using a nonlinear curve fitting algorithm. The experimental results showed that the S obtained from Fick's second law diffusion model did not provide an external resistance when the moisture is absorbed into the wood. While the diffusion model did not provide the best fit of the moisture absorption data, the calculated internal moisture transfer rate, D, still shows physical meanings. The temperature had a significant effect on the D. The higher the temperature, the greater the D obtained. The D showed a decreased trend as the RH (or EMC) increased. No specific trends were found on the D as a function of board density. Other limitations of the diffusion model for the moisture movement in wood are also discussed. Springer-Verlag, 2007 Wood Science and Technology Springer-Verlag 41/8(2007-12-01), 645-658 0043-7719 41:8<645 2007 41 226 https://doi.org/10.1007/s00226-006-0123-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00226-006-0123-4 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Shi Sheldon Forest Products Department, Mississippi State University, Box 9820, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 773 0- Wood Science and Technology Springer-Verlag 41/8(2007-12-01), 645-658 0043-7719 41:8<645 2007 41 226 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer