Fire Science and Technology
Online ISSN : 1882-0492
Print ISSN : 0285-9521
ISSN-L : 0285-9521
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Volume 9, Issue 1
Displaying 1-3 of 3 articles from this issue
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Science
  • Reduction of Smoke Particles from Fire Retarded Wood
    Osami Sugawa, Hirochika Yamamoto
    1989 Volume 9 Issue 1 Pages 1_1-1_10
    Published: 1989
    Released on J-STAGE: April 01, 2008
    DOIhttps://doi.org/10.3210/fst.9.1_1
    JOURNAL FREE ACCESS
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    The characterization of the smoke generation and reduction was pursued on the basis of the size distribution of smoke particles from wood and several fire retarded wood materials. Furnace temperatures were adopted of 300, 400, and 500°C due to the peak temperatures which were obtained from thermogaravimetry. The sizing instrument for smoke particles used a He-Ne laser as the light source, and the particle size range extended from 0.1 to 10 μm in by nine steps. For low smoldering state, the combination of molybdenum, bromine, and phosphate compounds as retardant agents gave the most desirable reduction of smoke particle generation in the experiments. And for higher temperature region, the combination of molybdenum and bromine compounds gave remarkable reduction of smoke generation.
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  • Numerical Analysis and Experiments of Convective Heat Flow in Fire Compartment
    Masahiro Morita, Masayuki Hirota
    1989 Volume 9 Issue 1 Pages 1_11-1_24
    Published: 1989
    Released on J-STAGE: April 01, 2008
    DOIhttps://doi.org/10.3210/fst.9.1_11
    JOURNAL FREE ACCESS
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    Theoretical and experimental numerical analysis shows the capabilities of finite difference calculations of fine induced natural convective heat flow in a fire compartment. The viscous, heat conductive, compressible fluid is represented using a K-ε model. Because a two-point upwind difference scheme gives numerical viscosity, the computational results are suspect at large velocities. The practical stability limits and truncation errors for finite difference equations approximating fire flows have been analyzed. The sensitivities of numerical solutions have been evaluated by the theoretical and experimental numerical analysis. Based on results of numerical experiments we propose a reasonable time interval and space mesh size criteria which also considers CPU time. Furthermore, we have introduced the effective maximum cell Reynolds number (Re∗) for the equation of motion, or the effective maximum cell Peclet number (Pe∗) for the equation of energy. We propose that the values of Re∗ and Pe∗ indicate the trust which may be placed on the approximate solutions.
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Technology
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