Convective burning of a droplet containing a single metal particle

Bhatia, R.; Sirignano, William A.

doi:10.1016/0010-2180(93)90104-b

Cited by 10 publications

(1 citation statement)

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“…In their early study, Brzustowski and Glassman (1964) modeled metal droplet combustion using many of the assumptions common in hydrocarbon droplet combustion models. Law (1973) first accounted for the effects of oxide condensation, and his model has been later extended by relaxing some assumptions (Bhatia and Sirignano 1993;Brooks and Beckstead 1995;Turns, Wong, Ryba 1987). Gremyachkin, Istratov, and Leipunskii (1979) and Kudryavtsev et al (1979) included effects of oxidizer diffusion to the particle surface and heterogeneous reactions, and Babuk, Belov, and Shelukhin (1981) studied the effect of metal oxide formation on combustion.…”

Section: Introductionmentioning

confidence: 99%

The Onset of Asymmetric Combustion of Aluminum Particles

Trottini

Higuera

2019

Combustion Science and Technology

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Combustion of an aluminum droplet in an oxidizer atmosphere is known to proceed in several stages. Ignition is followed by a first combustion stage in which the droplet is surrounded by a spherical diffusion flame, but this flame and the conditions at the droplet surface eventually cease to be uniform, giving way to a second combustion stage characterized by an asymmetric, spinning flame. This is followed by a final stage in which an oxide cap develops in the droplet. Oxygen reaches the surface of the burning droplet as aluminum suboxides and other oxygenated species produced at the flame, and dissolves in the liquid. The beginning of asymmetric combustion is associated with the appearance of an oxygen-rich liquid phase that is immiscible with aluminum. A simple model of the onset of asymmetric combustion is proposed that focuses on the adsorption of AIO at the surface, the heterogeneous reaction generating Al 2 0 3 , and the transfer of this species to the liquid bulk. Other aspects of the combustion are drastically simplified. The model shows that spherically symmetric combustion becomes unstable at a certain time, after which oscillatory perturbations develop that resemble the spinning flame observed experimentally. The instability depends on the interplay of adsorption of AIO and production of Al 2 0 3 at the surface, and disappears when the second of these processes is very fast.

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