Thermal constants of wood during the heating process measured with the laser flash method |
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| Authors: | Toshiro Harada Toshimitsu Hata Shigehisa Ishihara |
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| Institution: | (1) Forestry and Forest Products Research Institute, 305-8687 Ibaraki, Japan;(2) Wood Research Institute, Kyoto University, 611-0011 Uji, Japan |
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| Abstract: | The thermal diffusivity, specific heat, and thermal conductivity of 13 species of wood were measured by means of the laser flash method to investigate the thermal properties of wood during the heating process. The temperature ranged from room temperature to 270°C in air or under vacuum. The thermal diffusivity varied little during the heating process up to 240°C. The values in air were larger than those under vacuum. There was a linear relation between the specific heat and the ambient temperature, and the specific heat under vacuum was larger than that in air at high temperature. The thermal conductivity increased with density and the ambient temperature. To discuss the effects of the atmospheric conditions on the thermal constants of wood, a theoretical model of thermal conductivity was proposed and its validity examined, where the wood was assumed to be a uniformly distributed material composed of cell walls and air.Part of this paper was presented at the 47th annual meeting of Japan Wood Research Society at Kochi, April 1997 |
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| Keywords: | Thermal diffusivity Heat capacity Thermal conductivity Laser flash method Heating process |
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