A model is presented that explains the mass loss rate in a compartment as a function of fuel type and scale. The effect of ventilation is included in the model by the inclusion of the ambient oxygen concentration in the lower layer that results due to vent mixing. The model is executed in BRI2002, a zone model, capable of computing species and thermal conditions in the upper and lower compartment gas layers. Computations show good agreement with small-scale compartment data for heptane pools. The results can accurately portray extinction, oscillations in burning, reduction in the flaming area, and quasi-steady behaviors.
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