Microexplosion mechanisms of aluminium/carbon slurry droplets

Journal Article · Tue Mar 31 23:00:00 EST 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90078-4· OSTI ID:5523732

Wong, S C; Lin, A C ^[1]

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1. Dept. of Power Mechanical Engineering, National Tsing Hua Univ., Hsinchu (TW)

This paper reports on the microexplosion mechanisms of Al/C/JP-10 slurry droplets that have been studied experimentally and theoretically. Experimental work includes measurements of transient internal temperature distributions in convective hot gas flows for slurry droplets with and without surfactant. While surfactant-free slurry droplets are heated to the wet-bulb temperature of JP-10, the internal temperatures of the droplets with surfactant rise continuously, and microexplosion occurs as the outer part of the droplet becomes superheated. The presence of surfactant and fine carbon particles ({lt} 0.1 {mu}m) is found to suppress the evaporation of JP-10, promote the superheating and heterogeneous nucleation, and, with shell formation aided by surfactant pyrolysis, lead to microexplosion. With an appropriate amount of carbon (4 wt. % in the solid phase), no significant shrinking appears before microexplosion even for slurries of relatively low solids loadings (e.g., 30 wt. %). However, with carbon decreased ({lt}2 wt. %), the droplets shrink substantially before microexplosion.

• OSTI ID: 5523732
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 89:1; ISSN 0010-2180; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALUMINIUM
CARBON
CHEMICAL REACTIONS
CONVECTION
DECOMPOSITION
DISPERSIONS
DROPLETS
ELEMENTS
ENERGY TRANSFER
EXPLOSIONS
FLUIDS
GASES
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
METALS
MIXTURES
NONMETALS
PARTICLES
PYROLYSIS
SIMULATION
SLURRIES
SUSPENSIONS
TEMPERATURE DISTRIBUTION
THERMOCHEMICAL PROCESSES