- Author
- Jin, T. | Kumano, Y. K.
- Title
- On Extinction of Thermal Radiation Through Fire Smoke.
- Coporate
- Fire Research Institute, Tokyo, Japan
- Journal
- Bulletin of Japanese Association of Fire Science and Engineering, Vol. 28, No. 1, 7-12, 1978
- Report
- CIB W14/79/28 (J)
- Keywords
- thermal radiation
- Abstract
- Infrared extinction spectra in the 2-12um region have been obtained for smokes of wood, polystyrene foam, polyvinyl chloride and kerosene. Spectra were found to depend on smoke generating condition (smouldering of flaming) rather than on the sort of combustibles. In the 2-5um region, extinction coefficients for white smokes from smouldering solid combustibles were inversely proportional to the cube or fourth power of wavelength, while those for black smokes by flaming combustion were approximately proportional to the inverse of wvelength. In the 5-12um region, the extinction characteristics showed some irregularities probably due to selective absorption by water vapour and other gaseous combustion products. Experimental results with smouldering smokes were compared to calculated extinction characteristics based on the Mie theory to estimate smoke particle sizes. These were, in diameter, 1.2-1.3um for wood, 0.6-0.7um for polystyrene foam, and 0.7-0.8um for polyvinyl chloride, and were in good agreement with values formerly obtained by sedimentation method. (Abstract in English)