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• W2075300006 abstract "Experimental investigations were conducted on the effects of volatile additives in inducing and intensifying the microexplosion of combusting carbon slurry droplets. The mixture explosion temperatures were determined, and a new droplet generator capable of producing small droplets of well-controll ed size was developed for the slurry fuel used. Agglomerate fragments produced through microexplosion were collected by using an impactor-type sampling probe and statistically analyzed. Results show that the fragment sizes follow the log-normal distribution, and that addition of 5% volatile miscible fuels to the carbon slurry can substantially reduce the mean fragment size. ARBON slurries hold potential as high-energy-d ensity fuels for application in volume-limite d propulsion sys- tems. The realization of this potential, however, has been com- plicated by the occurrence of particle agglomeration, which is usually associated with the burning of slurry fuels. That is, it has been demonstrated that the gasification mechanism for slurry droplets consists of two stages.14 In the first stage the liquid component is preferentially gasified, leaving behind an agglomerate of the particles. In the second stage this agglomer- ate subsequently heats up, ignites, and burns, spanning a pe- riod that can be substantially longer than that involving liquid gasification. Thus, the overall burning time of a slurry droplet is significantly longer than those corresponding to either a liquid droplet of similar initial size or the single particles by themselves. Two suggestions have been offered to reduce the severity of this agglomeration problem. The first is to coat the particles with suitable chemicals in order to prevent particle adhesion. The second is to break up either the slurry droplet before the agglomerate is formed or the agglomerate itself after it is formed. The present investigation is concerned with the second alternative, based on the phenomenon of droplet micro- explosion. Recent theoretical and experimental studies on the droplet combustion of multicomponent fuels have demonstrated that, for suitable components and composition, rapid gasification within the droplet interior can occur spontaneously, leading to intense internal pressure buildup with consequent catastrophic fragmentation of the droplet. The occurrence of microexplo- sion can be facilitated through several major factors.5 First, the volatility differentials between the more and less volatile com- ponents should be as wide as possible in that the less volatile component is needed to drive up the droplet temperature while the more volatile component is needed for the ease with which it will spontaneously gasify. Second, internal gasification is facilitated in the presence of particles, as in slurries, which provide heterogeneous nucleation sites; without such sites the" @default.
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• W2075300006 date "1988-05-01" @default.
• W2075300006 modified "2023-10-17" @default.
• W2075300006 title "Effects of additives on the microexplosion of carbon slurry droplets" @default.
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• W2075300006 doi "https://doi.org/10.2514/3.23051" @default.
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