Combustion of the Ti + xC (1 > x > 0.5) Powder and Granular Mixtures
B. S. Seplyarskii, R. A. Kochetkov, S. G. Vadchenko
Institute of Structural Macrokinetics and Materials Sciences, Russian Academy of Sciences, Chernogolovka, 142432 Russia
Keywords: горение, гранулирование, самораспространяющийся высокотемпературный синтез, лучистый теплообмен, кондуктивный теплообмен, механизм горения, combustion, granulation, self-propagating high-temperature synthesis, radiant heat transfer, conductive heat transfer, combustion mechanism
Abstract
This paper describes the experiments on the combustion of the powder and granular mixtures of Ti + 0.5C, Ti + 0.75C, and Ti + C. Despite the fact that there is no convective heat transfer and the contact area between the particles is small, the burning rate of granular compositions (both linear and mass) turns out to be several times greater than in the case of powder mixtures of the same composition. The experimental and computational values of the adiabatic combustion temperature were used to estimate the contribution of the radiant and conductive heat transfer in the combustion wave propagation along the granulated mixtures. The experiments with pressed samples showed that the high combustion rate of the granular mixtures is due to great velocity of the combustion wave propagation along the granule rather than the specific features of the original reagents.
DOI: 10.1134/S001050821606006X
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