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A microwave applicator for on line wood drying: Temperature and moisture distribution in wood
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
ENGREF - Laboratory of Forest Sciences.
1999 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 33, no 2, p. 123-138Article in journal (Refereed) Published
Abstract [en]

An especially designed open microwave applicator was analysed using wood as the material to be heated and dried. The idea was to develop an on line microwave construction consisting of several small open applicators, each fed by a small standard magnetron (for example 1.4 kW main power). The process was analysed by measuring the wood temperature during heating using an IR-camera and detecting the moisture distribution during drying by CT-scanning. Pine and birch wood samples were used in the experiments, mainly 40 mm in thickness. The experiments show that the power distribution differs between dry wood and moist wood. The analysis of the temperature fields captured by the IR-camera during the first minutes allows a rather accurate determination of the MW power. Consequently, the drying proceeds unevenly in the wood specimens, especially in the longitudinal direction. The dimensions of the applicator and its relation to the wood dimension are very important. However, the wood was not destroyed, the temperature and moisture gradients did not affect the wood in terms of checks or deformations. The drying rate in different positions of the specimen varied between 0.30 and 0.80 percentage moisture content/min. The uneven energy, meaning temperature and field distribution, is to be compensated in the future by a moving wood load and by alternating the position of each applicator in a larger scale microwave pilot plant.

Place, publisher, year, edition, pages
1999. Vol. 33, no 2, p. 123-138
National Category
Bio Materials
Research subject
Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-9170DOI: 10.1007/s002260050104Local ID: 7bc9e2c0-0787-11dc-b09b-000ea68e967bOAI: oai:DiVA.org:ltu-9170DiVA, id: diva2:982108
Note
Godkänd; 1999; 20070521 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Antti, Lena

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