A mathematical model for predicting the course of a developing fire in a compartment is described. The model uses release rate data obtained from laboratory-scale tests to calculate the rate of heat and smoke generation within the compartment. From these data, the model predicts rate of involvement of combustible surfaces, upper layer temperatures, and smoke concentration as a function of time. The model is described by relationships used to determine: (i) ignition and rate of vertical fire propagation, (ii) release rates based on total heat released and incident flux, and (ii) heat losses by venting and accumulation within the boundaries of the compartment. Results of predicted by the model and observed in full-scale tests of furnished compartments are compared.

Slugging characteristics, including slug velocity and frequency and the height of the slugging bed, for a slugging bed of four different types of coarse particles ranging from 1 to 7 mm in size are determined based on pressure fluctuation behavior of the bed. The slugging characteristics of coarse particle slugging beds are found to be much different from those of the particle slugging beds reported in the literature. The pressure fluctuation behavior in a coarse particle turbulent bed and the transition velocity from a slugging bed to a turbulent bed is also examined.

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