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https://doi.org/10.5552/drind.2015.1506

Finite Changes of Bound Water Moisture Content in a Given Volume of Beech Wood

Richard Hrčka orcid id orcid.org/0000-0003-0704-8958 ; Odjel za znanost o drvu, Tehničko sveučilište u Zvolenu, Zvolen, Republika Slovačka


Puni tekst: engleski pdf 532 Kb

str. 315-320

preuzimanja: 789

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Sažetak

The undesired wood instabilities are connected with the changes of bound water moisture content. The rates of finite changes of bound water moisture content in a given volume of wood were determined in the frame of the specimen dimensions. The derivation is based on the 1st Fick’s law and diffusion equation solution in three dimensions. The inverse solution of diffusion equation provided the diffusion coefficients in the principal anatomical directions. Beech wood was tested. The nonlinear regression is involved in the inverse solution. Therefore, the starting values of diffusion coefficients were computed according to the proposed three dimensional square root scheme. The evaluation of data revealed the random character of transport characteristics. The sufficient condition for the slowest finite change of ound water moisture content in a given volume of beech wood is the ratio 8.7:1.5:1.0 of dimensions in longitudinal, radial and tangential directions.

Ključne riječi

beech wood; diffusion coefficient; moisture content

Hrčak ID:

150811

URI

https://hrcak.srce.hr/150811

Datum izdavanja:

7.1.2016.

Podaci na drugim jezicima: hrvatski

Posjeta: 1.526 *