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ON THE ROLE OF HETEROGENEOUS PROCESSES BY COMBUSTION OF ALUMINUM NANOPOWDERS IN WATER VAPOR

The paper presents a numerical estimate of the impact of heterogeneous reactions on the combustion of aluminum nanoparticles in water vapor. The specific feature of metal combustion in oxidizing media (O2, H2O, CO2, etc.), including aluminum, is the formation of a condensed phase. Two mechanisms of formation of the condensed phase of aluminum oxide are considered: condensation of thermally unstable gas molecules Al2O3 on aluminum oxide particles; and heterogeneous reactions on their surface involving aluminum suboxides (AlO, AlO2, and Al2O2) and atomic oxygen. The influence of heterogeneous reactions on the surface of Al nanoparticles with H2 O molecules is estimated. These reactions are involved in the process of combustion initiation. It is shown that their role at initial temperatures of 2300 K and above is insignificant.