Abstract
Investigations in recent decades have shown that the combustion mechanism of metal particles changes dramatically with diminishing size. Consequently, theoretical description of the ignition and combustion of metal nanoparticles requires additional research. At the same time, to substantiate theoretical models, it is necessary to obtain objective experimental information about characteristics of ignition and combustion processes, which is associated with solving serious technical problems. The presented review analyzes specific features of existing experimental methods implied for studying ignition and combustion of metal nanoparticles. This particularly concerns the methods for correct determination of nanoparticles size, correct description of their heat-exchange parameters, and determining the ignition delay and combustion times. It is stressed that the problem exists of adequate comparison of the data obtained with the use of different techniques of particles’ injection into a hot gas zone and the use of different methods of reaction time measurement. Additionally, available in the literature, data are obtained for particles of different material purity and different state of oxide layer. Obviously, it is necessary to characterize in detail all relevant parameters of a particle’s material and measurement techniques. It is also necessary to continue developing advanced approaches for obtaining narrow fractions of nanoparticles and for detailed recording of dynamic particles’ behavior in a hot gas environment.
Highlights
Metal nanoparticles are known from very distant times; for example, the famous Cup of Lycurgus, colored stained-glass windows in churches, etc
It should be noted that, It is important to emphasize that the necessary condition for the existence of a vapor-phase in available literature, this approach to the calculation of the total burning time of metal particles to mechanism of metal combustion is the excess of the flame temperature over the metal boiling point
The particles were oxidized at different temperatures in an aerosol flow reactor
Summary
Metal nanoparticles are known from very distant times; for example, the famous Cup of Lycurgus, colored stained-glass windows in churches, etc. The history of metal nanoparticles application in the combustion and explosion processes developed according to a typical scenario for new discoveries: first, a rapid euphoria and great expectations, a decline in interest, a decrease in activity, followed by a growth of interest and the achievement of real positive results. Research in recent decades has shown that the combustion mechanism of metal particles changes recent decades has shown that the combustion mechanism of metal particles changes dramatically dramatically along with changing their size This is clearly demonstrated by the diagrams of the dramatically along with changing their size. Is clearly demonstrated the diagrams ofthe the burning burning time dependency on theThis particle size, Figures
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