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<p>Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity</p> <p><b>New page</b></p><div>== Summary ==<br /> Heated length ahead of a spreading flame. Opposed-flow spread heats about 1 to 3 mm of fuel; in wind-aided spread the heated length is of the order of the flame length, 0.1 to 10 m. Based on Quintiere (2002b), p. 2-251.<br /> <br /> Original illustration for [[Trench effect]], level 4 Expert.<br /> <br /> * Source basis: Quintiere (2002b), p. 2-251 (control volume of wind-aided spread; Δ of the order of the flame length, 0.1 to 10 m, compared with 1 to 3 mm in opposed-flow spread; wind-aided spread can be acceleratory), Figure 2-12.5 (redraw, do not copy)<br /> * Alt text: Two fuel strips: left, a flame heating only a few millimetres ahead; right, a flame lying along the fuel and heating a long stretch ahead.<br /> <br /> == Licensing ==<br /> New drawing by Fire Safety Academy. © Fire Safety Academy.</div>

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