https://fire-safety.academy/w/index.php?action=history&feed=atom&title=File%3AFse-virtual-origin-v1.svg 2026-11-04T13:14:50Z Revision history for this page on the wiki MediaWiki 1.43.11 https://fire-safety.academy/w/index.php?title=File:Fse-virtual-origin-v1.svg&diff=2101&oldid=prev 2026-11-02T16:15:10Z

<p>Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity</p> <p><b>New page</b></p><div>== Summary ==<br /> The virtual origin is the point from which the plume above the flames appears to originate: below the fuel surface for a wide, low fire (left) and above it for a tall, intense fire (right). Based on Heskestad (2002), pp. 2-6 and 2-11.<br /> <br /> Original illustration for [[Virtual origin]], level 4 Expert.<br /> <br /> * Source basis: Heskestad (2002), p. 2-6 (equivalent point source, z replaced by z − z0, negative z0 below the fire source) and p. 2-9 (point source from which the plume above the flames appears to originate) and p. 2-11 (negative z0 for low heat release and large diameters, positive for high heat release); Iqbal and Salley (2004), p. 9-5 (Figure 9-3, redraw, do not copy)<br /> * Alt text: Two fire plumes: dashed plume edges extended downwards meet at a point below the fuel of a wide fire and above the fuel of a tall fire.<br /> <br /> == Licensing ==<br /> New drawing by Fire Safety Academy. © Fire Safety Academy.</div>

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