An experimental study on the heating and burning of a binary liquid mixture in a pool fire
Résumé
The paper presents experimental measurements for the transient profiles of burning rates and liquid temperatures (at different depths below the surface) in pool fires. Steel square burners with two different side lengths are selected: 10.5 and 15.0 cm. The burner is 5 cm deep and the initial fuel height is about 4.6 cm. At 10°C, the fuel is a mixture of cyclohexane and methanol with a molar composition of about 50%-50%. Under these conditions, there is a top cyclohexane-rich layer and a bottom methanol-rich layer. In the initial transient and steady-state periods, the burning is slightly lower than that of pure cyclohexane due to the presence of methanol in the top layer. Then, a sudden more intense burning occurs due to the expansion of methanol vapor reaching the surface. A semi-empirical model is proposed to predict the onset of this event, assuming that it corresponds to the interface between the two layers reaching the azeotropic point of the blend. A second steady-state period is subsequently established, corresponding to the burning of a well-mixed blend of both liquids at the azeotropic point, as measured by the thermocouples immersed into the liquid.
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