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Theory of transport processes in wood below the fiber saturation point. Physical background on the microscale and its macroscopic description
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Johannes Eitelberger
,
Staffan Svensson
Published/Copyright:
March 27, 2011
Abstract
The macroscopic formulation of moisture transport in wood below the fiber saturation point has motivated many research efforts in the past two decades. Many experiments demonstrated the difference in steady state and transient moisture transport and the inadequacy of models derived for steady state transport when used to describe transient processes. A suitable modeling approach was found by distinguishing between the two phases of water in wood, namely bound water in the cell walls and water vapor in the lumens. Such models are capable of reproducing transient moisture transport processes, but the physical origin of the coupling between the two phases remains unclear. In this paper, the physical background on the microscale is clarified and transformed into a comprehensive macroscopic description, ending up with a dual-scale model comprising three coupled differential equations for bound water, water vapor, and internal energy, as well as a simplified microscale model for determination of the coupling term.
Keywords: coupled diffusion processes; dual scale; fiber saturation point (FSP); phase change; transient transport processes
Received: 2010-7-29
Accepted: 2010-12-6
Published Online: 2011-03-27
Published Online: 2011-03-28
Published in Print: 2011-05-01
©2011 by Walter de Gruyter Berlin New York
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Keywords for this article
coupled diffusion processes;
dual scale;
fiber saturation point (FSP);
phase change;
transient transport processes
Articles in the same Issue
- Publisher’s Note
- Publisher’s Note
- ORIGINAL ARTICLES
- Brightness reversion of eucalyptus kraft pulp: Effect of carbonyl groups generated by hypochlorous acid oxidation
- MgSO4 vs. Mg(OH)2 as a cellulose protector in oxygen delignification
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- Preparation and physical characterization of strongly swellable oligo(oxyethylene) lignin hydrogels
- Activation of pine kraft lignin by Fenton-type oxidation for cross-linking with oligo(oxyethylene) diglycidyl ether
- Determination of pectin content of eucalyptus wood
- Theory of transport processes in wood below the fiber saturation point. Physical background on the microscale and its macroscopic description
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