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Flame Height From Rectangular Fire Sources Considering Mixing Factor

Sugawa, O., Satoh, H. and Oka, Y., 1991. Flame Height From Rectangular Fire Sources Considering Mixing Factor. Fire Safety Science 3: 435-444. doi:10.3801/IAFSS.FSS.3-435


Measurements of visible flame heights were carried out under quiescent atmospheric condition using single and multiple rectangular fire sources, with and without walls and/or a floor, to correlate flame height with the heat release rate considering entrainment effect. Flame height, Lf, is formulated as a function of heat release rate, Q, and mixing factor, km, as Lf oc km 2/(2n+3).Q2/(2n+3). The same configurations of multi fire sources but with and without walls and/or a floor produced different slopes in dimensionless correlation of the flame height, Lf/D, with Qrec 2/(2n+3) due to entrainment effects. For both terms, we confirmed n=O For single and unconfined line fire source(s), and n=l for square or circular fire source(s). Key words: line fire sources, flame merging, mixing factor, dimensionless heat release rate


Dimensionless heat release rate, Flame merging, Line fire sources, Mixing factor

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