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Official Journal of the Japan Wood Research Society

Thermal constants of wood during the heating process measured with the laser flash method


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.


  1. 1.

    Takahashi A, Nakayama Y (1992) Mokuzai Kagaku Koza 3 Butsuri (Wood Science Series 3 Physics) (in Japanese). Kaisei-sha, Otsu, pp 45–50

    Google Scholar 

  2. 2.

    Maku T (1954) Studies on the heat conduction in wood. Wood Res 13:1–80

    Google Scholar 

  3. 3.

    Sian JF (1984) Transport processes in wood. Springer, Tokyo, pp 132–143

    Google Scholar 

  4. 4.

    Urakami H, Fukuyama M (1981) The influence of specific gravity on thermal conductivity of wood (in Japanese). Bull Kyoto Prefect Univ For 25:38–45

    Google Scholar 

  5. 5.

    Kollmann F (1951) Technologic des Holzes und der Holzwelkstoffe, vol 1. Springer, Berlin, p 514

    Google Scholar 

  6. 6.

    Ouchi T (1988) Thermal conductivity of wood at high temperature. In: Proceedings of the 1988 international conference on timber engineering, Seattle, pp 441–447

  7. 7.

    JIS R 1611 (1991) Testing method of thermal diffusivity, specific heat capacity, and thermal conductivity for high performance ceramics by laser flash method (in Japanese). Japanese Industrial Standard

  8. 8.

    Parker WJ, Jenkins RJ, Butler CP, Abbott GL (1961) Flash method of determining thermal diffusivity, heat capacity, and thermal conductivity. J Appl Physics 32:1679–1684

    CAS  Article  Google Scholar 

  9. 9.

    Uesugi S, Ishihara S, Hata T (1993) Measurement of thermal constants of wood by laser flash method (in Japanese). In: Abstracts of the 43rd annual meeting of the Japan Wood Research Society. Morioka, p 384

  10. 10.

    Murata K, Sadoh T (1994) Heat absorption and transfer in soft woods and their knot surfaces (in Japanese). Mokuzai Gakkaishi 40:1180–1184

    Google Scholar 

  11. 11.

    National Astronomical Observatory (1992) Rika nenpyo (Chronological Scientific Tables) (in Japanese). Maruzen, Tokyo, p 475

    Google Scholar 

  12. 12.

    Shoji M (1995) Heat transfer textbook, University of Tokyo series on advanced mechanical engineering 6 (in Japanese). University of Tokyo Press, Tokyo, pp 1–261

    Google Scholar 

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Correspondence to Toshiro Harada.

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Harada, T., Hata, T. & Ishihara, S. Thermal constants of wood during the heating process measured with the laser flash method. J Wood Sci 44, 425–431 (1998).

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Key words

  • Thermal diffusivity
  • Heat capacity
  • Thermal conductivity
  • Laser flash method
  • Heating process