Thermal conductivity and diffusivity of wood

被引:222
作者
Suleiman, BM [1 ]
Larfeldt, J
Leckner, B
Gustavsson, M
机构
[1] Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden
[2] Chalmers Univ Technol, Dept Energy Convers, S-41296 Gothenburg, Sweden
[3] Chalmers Univ Technol, Dept Thermo & Fluid Dynam, S-41296 Gothenburg, Sweden
关键词
Porosity; Heat Transfer; Anisotropy; Thermal Conductivity; Heat Conduction;
D O I
10.1007/s002260050130
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Transient simultaneous measurements of thermal conductivity and diffusivity of Swedish wood have been performed with the plane source technique on oven-dry hardwood (birch) samples at room temperature and at 100 degrees C. The influences of temperature, density, porosity and anisotropy on thermal conduction were investigated. The measurements were done in longitudinal (parallel to the grain) and transverse (intermediate between radial and tangential) directions. As the temperature increased from 20 to 100 degrees C, the thermal conductivity of each sample increased slightly for both longitudinal and transverse directions. The effect of density and porosity on the thermal conductivity may be related to the presence of other scattering mechanisms such as voids and cell boundaries. It seems that the dominant mechanism of heat transfer across the cell lumina in these types of wood is the heat conduction through the voids. An attempt was made to explain the behaviour of the effective thermal conductivity by adopting a model based on the ratio between heat conduction in parallel and serial layers of gas, liquid, and solid phases.
引用
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页码:465 / 473
页数:9
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