Modeling of Heat and Moisture Transfer in Wood in Finish Drying by the Energy of a Microwave Field

Grinchik, N. N.; Адамович, А. Л.; Кизина, О. А.; Kharma, U. M.

doi:10.1007/s10891-015-1165-y

Cited by 6 publications

(5 citation statements)

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“…However, low-density woods seem favorable to drying, apparently because of their ability to deform internally to relieve the shrinkage stress. Shrinkage stress during drying can be relieved by several methods such as: (1) by increasing the surface moisture content (MC) of the wood via steam conditioning (Keey et al 2000); (2) by decreasing the internal MC of the wood; and (3) by increasing the MC of external wood and by decreasing the MC of internal wood simultaneously using microwave conditioning (Grinchik et al 2015;He and Wang 2015). Figure 5 shows that the length of surface checks increased linearly with increased treatment temperature both in sapwood and heartwood.…”

Section: Surface Checksmentioning

confidence: 99%

Effect of mechanical restraint on drying defects reduction in heat-treated okan wood

Hidayat

Jang

et al. 2017

BioRes

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Mechanical restraint through the use of clamps was applied as an attempt to prevent drying defects during the heat treatment of high-density wood. Boards of okan (Cylicodiscus gabunensis (Taub.) Harms) with the initial moisture content of 8.99% and 9.68% for sapwood and heartwood, respectively, were prepared. The boards were heat-treated under an oxygen atmosphere at the peak temperatures of 160 °C, 180 °C, 200 °C, and 220 °C with a residence time of 2 h. The occurrence of drying defects as checks (i.e., surface and end checks) and warps (i.e., bow, cup, and twist) were evaluated. Heat treatment stimulated the occurrence of drying defects in okan wood. The results revealed that the surface checks, end checks, and twists increased linearly with increased temperature. The occurrence of warps, such as bow and cup, after heat treatment was relatively low. Heartwood showed a higher degree of drying defects compared to the sapwood. Application of mechanical restraint by clamping efficiently decreased the occurrence of drying defects of okan wood, particularly surface checks, end checks, and twists.

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Section: Surface Checksmentioning

confidence: 99%

Effect of mechanical restraint on drying defects reduction in heat-treated okan wood

Hidayat

Jang

et al. 2017

BioRes

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“…Therefore, there is an objective need to construct mathematical models of non-isothermal moisture transfer and study the influence of thermodiffusion on mass transfer in the drying of capillary-porous materials, taking into account the motion of the evaporation zone for nonstationary drying schedules, as well as to develop effective analytical and numerical methods for their implementation. The vast majority of drying processes of capillary-porous materials, in particular wood, is accompanied by a deepening of the zone of moisture evaporation inside the material [1][2][3][4]. The boundary of the phase transition itself depends on time, and its identification is carried out in the process of finding a solution, which determines the nonlinearity of the mathematical models under study.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of convection drying process of wood taking into account the boundary of phase transitions

Sokolovskyy¹,

Boretska²,

Gayvas³

et al. 2021

Math. Model. Comput.

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The article deals with constructing and implementing mathematical models of non-isothermal moisture transfer during drying of anisotropic capillary-porous materials, in particular wood, taking into account the movement of the evaporation zone for non-steady drying schedules, as well as to the development of effective analytical and numerical methods for their implementation. An analytical-numerical method for the determination of non-isothermal moisture transfer under non-steady schedules of the drying process has been developed, taking into account the dynamics of the phase transition boundary change. Calculation relationships are established for determining the phase transition temperature taking into account transport gradients and time for which the relative saturation reaches the boundaries of the phase transition.

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“…Examples include the technique of wood bending after microwave heating, lumber drying via microwave heating, and pressing systems that use microwave heating (Antti 1992;Antti and Perre 1999;Montoro and Manrique 1999;Wang and Xue 2002;Tu 2007;Prasad and Pandey 2012). And some research has focused on wood structure and water transfer in wood under the microwave heating (Daian 2011;Gašparik and Gaff 2013;Grinchik et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Drying Stress Relaxation of Wood Subjected to Microwave Radiation

He¹,

Wang²

2015

BioResources

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An effective and rapid drying stress relieving technique was developed using microwave conditioning. The process was analyzed by measuring the stress factor and moisture content gradient through the thickness of the board. The experiments showed that the drying quality of E. urophylla x E. tereticornis was improved after microwave conditioning during the wood drying process. The drying stress relaxation increased with the duration of the microwave radiation. Stress and moisture content gradient through the thickness of the board were compared and are discussed in this report.

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Modeling of Heat and Moisture Transfer in Wood in Finish Drying by the Energy of a Microwave Field

Cited by 6 publications

References 0 publications

Effect of mechanical restraint on drying defects reduction in heat-treated okan wood

Effect of mechanical restraint on drying defects reduction in heat-treated okan wood

Mathematical modeling of convection drying process of wood taking into account the boundary of phase transitions

Drying Stress Relaxation of Wood Subjected to Microwave Radiation

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