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• W1986142502 abstract "Stability and scaling analyses were applied to experimental data obtained by this group and other researchers on pulsating flame spread over liquids. Data to be analyzed include recent findings of cyclic appearance of a cold temperature valley at the liquid surface-created surface-wave ahead of the spreading flame, and main-pulsation of 0.5–2 Hz and sub-pulsation of 5–10 Hz. Our stability analysis is performed to understand the mechanism of instability on the liquid surface ahead of a flame’s leading edge, which is thought of as the major cause for pulsating flame spread. The scaling analysis is performed to explore the role of four independent (gravity, surface-tension, viscose, and inertia) forces on the mechanisms of flame spread. These four forces form three independent pi-numbers: Marangoni (Ma) number, Weber (We) number, and Froude (Fr) number, all of which include the critical length scale ratio: (height of sub-surface circulation)/(horizontal length of preheated liquid surface). We combined the wave equation obtained from the stability analysis, the three pi-numbers, and the critical length scale ratio, and used them as a universal formula to describe flame spread over liquids. Using this formula, flame spread mechanism over four different types of alcohols was divided into two separate regimes: the thin liquid pool and the thick-liquid pool. For the thin liquid pool, the flame spread rate was correlated with (Fr/Ma0.5)−1.0, while for the thick-liquid pool it was correlated with (Fr/Ma0.5)−1.5. Change of flame spread pattern from the uniform to the pulsating can be described with temperature difference between the flash point and bulk liquid temperature. For the thin liquid pool this temperature difference is correlated with Ma−0.5, while for the thick-liquid pool it is correlated with Ma−1. The frequency of pulsation is correlated with We−1.0 for the thin liquid pool, while it is correlated with We−1.5 for the thick-liquid pool." @default.
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• W1986142502 date "2005-01-01" @default.
• W1986142502 modified "2023-10-02" @default.
• W1986142502 title "Scaling and instability analyses on flame spread over liquids" @default.
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• W1986142502 doi "https://doi.org/10.1016/j.proci.2004.08.246" @default.
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