Bulletin of Japan Association for Fire Science and Engineering
Online ISSN : 1883-5600
Print ISSN : 0546-0794
ISSN-L : 0546-0794
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Volume 34, Issue 2
Displaying 1-2 of 2 articles from this issue
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Paper
  • Study on the Hot-layer Behaviors in Tunnel Fires (Part II) Numerical Estimations of Flow Behaviors
    Ryoya KITAHARA, Minoru UMEZU
    1985 Volume 34 Issue 2 Pages 25-37
    Published: 1985
    Released on J-STAGE: July 04, 2012
    DOIhttps://doi.org/10.11196/kasai.34.2_25
    JOURNAL FREE ACCESS
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    In the previous report, we investigated the temperature and velocity fields of hot-layer along the ceiling in the full-scale and model tunnels.
    The purpose of the present study is to clarify the relation between these experimental results and related parameters such as physical size of tunnel, burning rate of fire source, and Froude and/or Stanton numbers. An analytical approach to the evaluations of the attenuation coefficients of velocity and excess temperature with distance along the tunnel is made using a two-dimensional steady-state model consisting of a fire plume, an impinging over the assumptions employed, the estimated results are shown to be in reasonable agreement with the experimental data.
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  • Study on Smoldering-Flaming Transition of Solid Materials - Effects of Oxygen Concentration and Sample Geometry -
    Setsuko SEGA, Kenji SATO
    1985 Volume 34 Issue 2 Pages 39-44
    Published: 1985
    Released on J-STAGE: July 04, 2012
    DOIhttps://doi.org/10.11196/kasai.34.2_39
    JOURNAL FREE ACCESS
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    The conditions of the transition from smoldering spread to flaming spread were investigated experimentally for two types of cellulosic materials. The fuels were homogeneous cylinders made of cardboard or filter paper with different diameters. They were setted vertically in an apparatus for oxygen index measurements.
    A critical value of the ambient oxygen concentration (mole fraction) Xoc for the transition was determined and the maximum surface temperature of the cylinder was measured by fine wire thermocouple.
    Following results were obtained.
    i) For downward spread, Xoc decreases and approaches to a constant value as the cylinder diameter increases, but for upward spread, Xoc changes very slightly with the diameter.
    ii) The maximum surface temperature near the critical condition increases as the cylinder diameter decreases.
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