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Liquid water flow in Pinus radiata during drying
University of Stellenbosch.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknologi.
University of Stellenbosch.
2007 (Engelska)Ingår i: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 65, nr 4, s. 275-283Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

End-sealed 60×60×250 mm3 Pinus radiata pieces were dried at 65/37 °C (dry bulb/wet bulb temperature) and 4 ms-1 air speed to study various drying phenomena above fibre saturation point. While drying, an X-ray computed tomography (CT) scanner captured a cross-cut density image every ten minutes. The density data was used to determine moisture content, rate of moisture loss from the core, wetline (boundary line of the free water region) depth and cross-cut area of the wood pieces. Repeating patterns were observed, which indicated that the cavity-size distribution of the wood pieces dictated fluctuations in the rate of moisture loss from the core and cross-cut area shrinkage during drying in the free water phase. It is hypothesised that, while drying an interconnected capillary network in the free water phase, the largest meniscus penetrates a wood piece through the largest cavities, thus also allowing air into the capillary network. The largest meniscus would always get smaller as it penetrates the wood piece until it is not the largest meniscus in the network anymore. Then the new largest meniscus would start penetrating the capillary network, etc. The largest meniscus would also determine the liquid tension in the capillary network. When the largest meniscus gets small enough, and the liquid tension strong enough, deformation and collapse of the remaining liquid-filled cavities can occur. A large liquid-filled interconnected capillary network would eventually fragment into a number of smaller liquid-filled interconnected networks, at which point a receding wetline could be observed.

Ort, förlag, år, upplaga, sidor
2007. Vol. 65, nr 4, s. 275-283
Nationell ämneskategori
Biomaterial
Forskningsämne
Träfysik
Identifikatorer
URN: urn:nbn:se:ltu:diva-4366DOI: 10.1007/s00107-007-0171-yISI: 000248328000004Scopus ID: 2-s2.0-34547153129Lokalt ID: 24e9c0d0-7017-11dc-a60c-000ea68e967bOAI: oai:DiVA.org:ltu-4366DiVA, id: diva2:977231
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Validerad; 2007; 20071001 (bajo)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad

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