Smoky Plasma in a Dust Flame

Poletaev, N. I.; Zolotko, A. N.; Doroshenko, Yu. A.; Khlebnikova, M.E.

doi:10.15407/ujpe59.04.0379

Cited by 4 publications

(19 citation statements)

References 11 publications

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“…Reducing the size of Al 2 O 3 nanoparticles with increasing concentration of impurities was confi rmed experimentally [10,15]. It has been found that the dependency of the average particle size Al 2 O 3 on the concentration of easily ionized additive has an extremum (a minimum, Fig.…”

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 84%

“…Thermal ionization of the additives leads to a redistribution of charges between the condensed and gas phases, a change in the charge of the particles and, hence, a change in the rate of their coagulation [7,10,15].…”

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

“…The studies were carried for three kinds of thermally easily ionized additive: potassium carbonate (K 2 CO 3 ), potassium chloride (KCl) and cesium iodide (CsI). Features of received dependencies were analyzed in the detail in [10,15].…”

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

“…These features of the coagulation process are also poorly understood. particles on additive concentration [15]. (Pointsexperiment; line is an approximation).…”

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

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Energy and Technological Aspects of the Combustion of Ionized Gas-Dispersed Systems

Poletaev¹,

Шевчук²,

Khlebnikova³

2016

Eur Chem Tech J

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This paper discusses the fl ame ionization effect on the combustion processes in gaseous suspensions of the dispersed fuels. It is shown that the two-phase fl ame ionization affects almost all the processes of the fuel conversion -kinetics of the dispersed fuel combustion, processes of the interphase heat and mass transfer, processes of the nucleation and coagulation in the fl ame, formation of nanoscale products of the metal particles combustion. It is shown that the electrostatic interaction between the charged nanoparticles and ions or polar molecules in the gaseous phase leads to the appearance of molecular "pumps" that can signifi cantly change the kinetics of the heterogeneous chemical reactions and the heat exchange between particles and gas. The infl uence of the thermal ionization of the fl ame on the nucleation mechanism and rate in gas-dispersed systems is discussed. The possibility of a barrier-free homogenous and heterogeneous nucleation in the dusty fl ame of metallic particles is shown. The effect of electrostatic and polarizing interactions of ions and molecules on the kinetics of the ternary gas-phase reactions is considered. The infl uence of the monodisperse aerosol ionization degree on the kinetics of its coagulation is analyzed. It is concluded that electrostatic interaction between the particles strongly affects the inhibition of the coagulation process in gas-phase combustion products and the possibility of very fast (explosive) charged particle coagulation of monodisperse aerosols. The possibility of the targeted size of metal oxides nanoparticles control, controlled ionizing of dusty fl ames and the role of ion particle entrainment, the dependency of their size of the fl ame ionization degree are discussed. Some effects arising in complex plasma of condensed combustion products under its own electric fi elds in fl ames, also when the burning dust is entrained into a constant electric fi eld and their practical applications for diagnosis are considered.

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Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 84%

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

“…These features of the coagulation process are also poorly understood. particles on additive concentration [15]. (Pointsexperiment; line is an approximation).…”

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

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Energy and Technological Aspects of the Combustion of Ionized Gas-Dispersed Systems

Poletaev¹,

Шевчук²,

Khlebnikova³

2016

Eur Chem Tech J

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“…X-ray phase and energy-dispersive analyses and electron microscopy of combustion products [9,34,39] showed that, unlike nanoparticles of aluminum, iron, and titan oxides, whose particles are solid spheres, zinc and magnesium oxides are formed in the form of hexagonal (ZnO, Fig. 3a) and cubical (MgO; Fig.…”

Section: Production and Properties Of Dust Flames Of Gas Suspensions mentioning

confidence: 99%

Gas-disperse synthesis of metal oxide particles

Zolotko

Poletaev

Vovchuk

2015

Combust Explos Shock Waves

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The main results of years of research of metal dust flames aimed at the development of the scientific basis for the method of gas-disperse synthesis of metal oxide nanopowders are discussed. Methods of burning metal dust in oxide-containing media, the key problems of gas-disperse synthesis, and possible ways to solve these problems are considered. The ways of controlling the disperse composition of vapor-phase and gas-phase combustion products of metal particles by variation of the macroparameters of the dust flame and ionization of condensed and gaseous phases in the combustion zone with the help of adding easily ionized atoms to the fuel are analyzed. It is shown that an adequate description of condensation in a flame is impossible without consideration for the influence of electrophysical processes on nucleation and coagulation in the flame. It is established that ionization of the condensed phase is the most significant factor during coagulation of nano-oxide particles in a dust flame. This allows expecting that the influence on particle ionization may turn out to be an effective method of controlling the dispersion of the target products of gas-disperse synthesis.

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Coagulation of the Ionized Combustion Products in a Dust Flame of Aluminum Particles

Poletaev

Khlebnikova

2019

Journal of Chemistry

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The addition-agent effect of atoms of alkali metals (K, Na, Li, and Cs) and halogens (Cl and I) introduced into the combustion zone of a dust flame of aluminum particles on the average size of Al2O3 nanoparticles is studied. A physical model of coagulation of a monodisperse aerosol is proposed. The model takes into account the formation of a complex plasma consisting of positive and negative ions, electrons, neutral gas molecules, and suspended particles of the condensed phase in the combustion zone. The effect of the forces of Coulomb repulsion of unipolarly charged Al2O3 particles as well as their possible attraction by ion wind on the constant of the coagulation rate is also taken into account. It is shown that at low ion concentrations in the plasma, the coagulation rate is determined by the Coulomb repulsion of the particles, and at ion concentrations greater than 1020 m−3 the coagulation rate is determined by the attraction of the particles by the ion wind. The results of calculations of the dependence of the average Al2O3 particle size on the concentration of the additives are in a good quantitative agreement with the experimental data. The combined effect of the additives and the equilibrium products of aluminum oxide (AlO, Al, and Al2O) evaporation on the concentration of positive and negative gas ions, electrons, and Al2O3 particle size in the condensation zone is analyzed. The peculiarities of the influence of the additives of electronegative gases (Cl and I atoms) on the coagulation rate of a thermally ionized aerosol and on the particle size of Al2O3 are considered.

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Smoky Plasma in a Dust Flame

Cited by 4 publications

References 11 publications

Energy and Technological Aspects of the Combustion of Ionized Gas-Dispersed Systems

Energy and Technological Aspects of the Combustion of Ionized Gas-Dispersed Systems

Gas-disperse synthesis of metal oxide particles

Coagulation of the Ionized Combustion Products in a Dust Flame of Aluminum Particles

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