This paper is devoted to the study of ultrafine magnesia formed during the single Mg particle combustion in air. This investigation is of interest because the properties of oxide particulate determine the radiation heat transfer during the combustion of the volatile metals. The interferometry technique for the measurement of ultra-fine particle volume fraction is offered. The interferograms of the single Mg particle burning in air are obtained using the Mach-Zehnder type interferometer specially adjusted for highly emitting and scattering flame. The spatial distribution of ultra-fine magnesia volume fraction in Mg particle flame is restored. The gas temperature in the region without smoke is determined. The ultra-fine oxide particle emissivity is obtained. It is found that this emissivity is on 3 orders greater than the theoretically calculated value. The natural gas convection velocity is obtained. The correlation between the relative gas-particle motion and the emissivity of Mg particle flame is discussed.
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Shoshin et al. (2002) studied this question.