An experimental study been carried out on the burning behavior of an emulsion droplet supsended on a quartz fiber. attention was apid mainly to the occurrence of microexplosion, which may be caused by the bubble nucleation at temperatures below the superheat limit. The oil-in-water emulsion consisting of the base fuel water was employed after desasification. The base fuels used were n-tetradecane and n-hexadecane. The water content varied from 0.1 to 0.3 by volume. The waiting time for the onset of microexplosion was measured for about 30 runs. The microexplosion is assumed to be a random process, and the onset probability of microexplosion was discussed from the statistical point of view. The Weibull distrubtion, which is derived mathematical from the weakest link destruction model, was adpoted for this purpose. The results showed that the distribution function fo the waiting time correlated with the Weibull distribution. The distribution function is classificed the wearout type at the initial heatin gperiod and as the chance failure type at the constant-temperature period. Thus, the type of Weibull distribution of the waiting time is dependent on the gariation of the droplet temperature with time. The onset rate of microexplosion increases exponentially as the superheating of water increases. The reliance of the onset rate on the superheating of water is independent of the base fuel.
展开▼
