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Heat and mass transfer during sapwood drying above the fibre saturation point
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-3544-8716
2000 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 18, no 8, p. 1647-1664Article in journal (Refereed) Published
Abstract [en]

Pine sapwood was dried in an air convection kiln at temperatures between 60-80 °C. Temperature and weight measurements were used to calculate the position of the evaporation front beneath the surface. It was assumed that the drying during a first regime is controlled by the heat transfer to the evaporation front until irreducible saturation occurs. Comparisons were made with CT-scanned density pictures of the dry shell formation during initial stages of drying of boards. The results indicate a receding evaporation front behaviour for sapwood above approximately 40-50% MC when the moisture flux is heat transfer controlled. After that we finally reach a period where bound water diffusion is assumed to control the drying rate. The heat transfer from the circulating air to the evaporation front controls the migration flux. In many industrial kilns the heating coils therefore have too small heat transfer rates for batches of thin boards and boards with high sapwood content.

Place, publisher, year, edition, pages
2000. Vol. 18, no 8, p. 1647-1664
National Category
Bio Materials
Research subject
Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-2833Local ID: 08bf2aa0-bb52-11db-b560-000ea68e967bOAI: oai:DiVA.org:ltu-2833DiVA, id: diva2:975687
Note
Validerad; 2000; 20061017 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Sehlstedt-Persson, MargotMorén, Tom

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