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Studies of water vapor transport and sorption in wood

Wadsö, Lars LU (1993) In Report TVBM 1013
Abstract
This thesis deals with the evaluation of measurements of water vapor transport and sorption in wood. It mainly concerns measurements of the weight response of a sample after a step change in relative humidity. The thesis consists of an introduction and eight papers. The eight papers have the following contents:



1. A description of the instrumentation and its performance characteristics.

2. Some first results on sorption in spruce wood. Non-Fiction behavior is seen above 75% relative humidity.

3. In this part the main experimental results are presented. At lower relative humidity (absorption from 54 to 75%) the normally used Fiction approach can describe the major part of the sorption process. At higher... (More)
This thesis deals with the evaluation of measurements of water vapor transport and sorption in wood. It mainly concerns measurements of the weight response of a sample after a step change in relative humidity. The thesis consists of an introduction and eight papers. The eight papers have the following contents:



1. A description of the instrumentation and its performance characteristics.

2. Some first results on sorption in spruce wood. Non-Fiction behavior is seen above 75% relative humidity.

3. In this part the main experimental results are presented. At lower relative humidity (absorption from 54 to 75%) the normally used Fiction approach can describe the major part of the sorption process. At higher relative humidity (from 75 to 84%), however, the major part of the sorption is very slow and governed by non-Fiction effects, which are not dependent on direction of flow, sample size or wood species. The slow sorption of water vapor in the cell wall is believed to cause this phenomenon.

4. A test of the effect of different disturbances (e.g. the surface resistance) on the normally used methods of evaluating sorption measurements is presented.

5. In this paper problems concerning measurements of surface mass transfer coefficients are discussed.

6. A discussion of how non-Fickian behavior in wood could be measured and modelled.

7. An error analysis of a transient sorption measurement is developed.

8. The error analysis is applied on two measurements. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Perre, Patrick
organization
publishing date
type
Thesis
publication status
published
subject
keywords
evaluation, measurements, non-Fickian behavior, absorption, sorption method, transient, unsteady-state, wood, sorption, surface mass transfer coefficient, water vapor, error analysis
in
Report TVBM 1013
pages
102 pages
publisher
Division of Building Materials, LTH, Lund University
defense location
Sektionen för väg- och vattenbyggnad, sal V:A, tekniska fakulteten vid Lunds universitet
defense date
1993-05-14 10:15
external identifiers
  • other:TVBM-1013
ISSN
0348-7911
language
English
LU publication?
yes
id
a3ed4ac6-8a79-4da3-a8c9-174e41d71d19 (old id 1272871)
date added to LUP
2008-12-05 13:22:49
date last changed
2016-09-19 08:44:53
@phdthesis{a3ed4ac6-8a79-4da3-a8c9-174e41d71d19,
  abstract     = {This thesis deals with the evaluation of measurements of water vapor transport and sorption in wood. It mainly concerns measurements of the weight response of a sample after a step change in relative humidity. The thesis consists of an introduction and eight papers. The eight papers have the following contents:<br/><br>
<br/><br>
1. A description of the instrumentation and its performance characteristics.<br/><br>
2. Some first results on sorption in spruce wood. Non-Fiction behavior is seen above 75% relative humidity.<br/><br>
3. In this part the main experimental results are presented. At lower relative humidity (absorption from 54 to 75%) the normally used Fiction approach can describe the major part of the sorption process. At higher relative humidity (from 75 to 84%), however, the major part of the sorption is very slow and governed by non-Fiction effects, which are not dependent on direction of flow, sample size or wood species. The slow sorption of water vapor in the cell wall is believed to cause this phenomenon.<br/><br>
4. A test of the effect of different disturbances (e.g. the surface resistance) on the normally used methods of evaluating sorption measurements is presented.<br/><br>
5. In this paper problems concerning measurements of surface mass transfer coefficients are discussed.<br/><br>
6. A discussion of how non-Fickian behavior in wood could be measured and modelled.<br/><br>
7. An error analysis of a transient sorption measurement is developed.<br/><br>
8. The error analysis is applied on two measurements.},
  author       = {Wadsö, Lars},
  issn         = {0348-7911},
  keyword      = {evaluation,measurements,non-Fickian behavior,absorption,sorption method,transient,unsteady-state,wood,sorption,surface mass transfer coefficient,water vapor,error analysis},
  language     = {eng},
  pages        = {102},
  publisher    = {Division of Building Materials, LTH, Lund University},
  school       = {Lund University},
  series       = {Report TVBM 1013},
  title        = {Studies of water vapor transport and sorption in wood},
  year         = {1993},
}