On Determination of Surface Emission Factors in Wood Drying

On Determination of Surface Emission Factors in Wood Drying Introduction The main reason for degrade of wood in the Nordic countries is surface checking. Therefore, it is important to study the stress development during drying. A successful study of that requires a good control of the moisture transport and, especially, the moisture content of the surface. The wood drying problem can be treated as a diffusion problem. The internal moisture transport is in the first approximation well characterized by a constant diffusion coefficient. However, there is also a resistance for the moisture to leave the wood surface and to be transferred to the ambient drying air. This effect is characterized by the so-called surface emission factor. One of the components of this factor is the resistance for the moisture to penetrate the boundary layer. The theory for that is well-known from the science of heat and mass transfer. There are indications from experiments that the surface emission factor has an additional component emanating from the porous and hygroscopic nature of wood. The aim of this work is to find a method to measure this latter component and to analyse the diffusion problem theoretically applied to the wood drying problem. The diffusion problem is of course 'not a http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood de Gruyter

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0018-3830
eISSN
1437-434X
DOI
10.1515/hfsg.1993.47.5.391
Publisher site
See Article on Publisher Site

Abstract

Introduction The main reason for degrade of wood in the Nordic countries is surface checking. Therefore, it is important to study the stress development during drying. A successful study of that requires a good control of the moisture transport and, especially, the moisture content of the surface. The wood drying problem can be treated as a diffusion problem. The internal moisture transport is in the first approximation well characterized by a constant diffusion coefficient. However, there is also a resistance for the moisture to leave the wood surface and to be transferred to the ambient drying air. This effect is characterized by the so-called surface emission factor. One of the components of this factor is the resistance for the moisture to penetrate the boundary layer. The theory for that is well-known from the science of heat and mass transfer. There are indications from experiments that the surface emission factor has an additional component emanating from the porous and hygroscopic nature of wood. The aim of this work is to find a method to measure this latter component and to analyse the diffusion problem theoretically applied to the wood drying problem. The diffusion problem is of course 'not a

Journal

Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Woodde Gruyter

Published: Jan 1, 1993

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