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Heating and drying wood using microwave power
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
1999 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The potentials for moisture flux in wood during microwave heating have been investigated experimentally and theoretically. The experiments were performed in three different kinds of microwave applicators. A computer model based on the finite difference method was developed to describe and predict the heat and mass transfer. The main conclusions are that microwave energy of 2.45 GHz frequency makes it possible to heat and dry pine and spruce 20 - 30 times faster than with conventional methods without any deterioration in drying quality. Some hardwoods are dried in approximately half the time compared to the softwoods. The drying method evokes unique results either with diminishing colour changes or with possibilities to create such during drying. However, to avoid unevenness in the electromagnetic field distribution and considering the limitation in power penetration depth the drying should be performed on line where wood components continuously are fed through a microwave field.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1999. , 27 p.
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 1999:35
Research subject
Wood Physics
URN: urn:nbn:se:ltu:diva-25891Local ID: b9c51970-86bb-11db-8975-000ea68e967bOAI: diva2:999049

Godkänd; 1999; 20061117 (haneit)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2016-10-20Bibliographically approved

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Antti, Lena
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