Abstract
A numerical model is developed to study the transient behaviour of composite droplet evaporation, ignition and diffusion-flame burning. The droplets consist of an aqueous core embedded within a liquid fuel shell. The value of a quasi-steady theory is assessed in the cases of pure evaporation and diffusion-flame burning. Ignition is characterized by thermal runaway which terminates in an explosive event. Of particular interest in the case of diffusion-flame burning are those examples in which the temperature of the aqueous core exceeds its boiling point before the fuel shell has completely evaporated. It is suggested that the resulting fragmentation of the droplet may help to substantiate the claims which are made in respect of the more efficient burning of emulsified fuels.
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