Macroscopic X-ray computed tomography aided numerical modelling of moisture flow in sawn timber

Florisson, SaraUppsala universitet,Luleå tekniska universitet,Träteknik,Applied Mechanics, Uppsala University, Uppsala, Sweden,Tillämpad mekanik (författare)

Validerad;2022;Nivå 2;2022-11-29 (hanlid);Funder: Swedish wood industry; Gabrielssons foundation
Mathematical models are essential for the development of schedules for the air-circulation drying of timber in Swedish sawmills, but earlier models have been shown to be conservative leading to longer drying times than necessary. In the current study, macroscopic (macro) X-ray computed tomography (CT) has been used in both the development and validation of a finite element (FE) model, to enable the macro-CT aided FE modelling of the nonlinear transient moisture flow in wood. The model uses more advanced theory than has previously been used in Swedish sawmills, by incorporating a surface emission coefficient to simulate the surface resistance to moisture flow. A single piece of Norway spruce [Picea abies (L.) Karst.] timber was subjected to that part of a traditional kiln-drying schedule, which is associated with diffusion-driven moisture transport. The incorporation of macro-CT data into the FE model resulted in a more realistic representation of the board’s geometry, the initial moisture state, and the definition of material parameters. It also led to a better simulation of flow speed and moisture gradient, especially the asymmetric MC development within the cross section throughout the drying process.

Hansson, LarsOcean Operations and Civil Engineering, Norwegian University of Science and Technology, Ålesund, Norway (författare)
Couceiro, José,1983-Luleå tekniska universitet,Träteknik(Swepub:ltu)joscou (författare)
Sandberg, Dick,1967-Luleå tekniska universitet,Träteknik(Swepub:ltu)dicsan (författare)
Luleå tekniska universitetTräteknik (creator_code:org_t)

Ingår i:European Journal of Wood and Wood Products: Springer80:6, s. 1351-13650018-37681436-736X

Av författaren/redakt...: Florisson, Sara; Hansson, Lars; Couceiro, José, ...; Sandberg, Dick, ...

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