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

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

Hansson, Lars (författare): Ocean Operations and Civil Engineering, Norwegian University of Science and Technology, Ålesund, Norway

(creator_code:org_t)

2022-08-17
2022
Engelska.
Ingår i: European Journal of Wood and Wood Products. - : Springer. - 0018-3768 .- 1436-736X. ; 80:6, s. 1351-1365

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Abstract Ämnesord

Stäng

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.

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

Om ämnet

LANTBRUKSVETENSKAPER: LANTBRUKSVETENSK ...; och Lantbruksvetensk ...; och Trävetenskap

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Annan materialte ...

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