Flame Spread over a Thin Combustible Solid : 3rd Report, Downward Flame Spread along a Vertical Cylinder of Paper

概要

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The Vertical downward spread of flame along a cylinder made of paper, placed in the atmosphere was investigated. The purposes of this study are to correlate the flame spread rate with the diameter, and to clarify the effect of shape of a thin combustible solid on the flame spread rate. With the other conditions the same, the flame spread rate increases with the diameter, and at the inner diameter over 10 mm it becomes greater than that of a single sheet of plain paper. A simple model for the analysis of heat transfer was employed to explain the experimental results. The theoretical flame spread rates predicted from the model were in good agreement with the experimental results. It is concluded from the experimental and theoretical results that the radiative heat transfer from the ember and the flame inside the cylinder plays an important role in increasing the flame spread rate with the diameter.
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