Present State of the Theory of Homogeneous Nucleation

Lushnikov, A. A.; Sutugin, A. G.

doi:10.1070/rc1976v045n03abeh002621

Cited by 43 publications

(18 citation statements)

References 3 publications

(3 reference statements)

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“…If we neglect both the coagulation and fragmentation of nuclei, then, instead of the Szilard-Farkas equations [4], the evolution of the nuclei size distribution function can be determined by solving the Becker-Döring-Zel'dovich kinetic equations [22][23][24][25]:…”

Section: Nucleation Rate Of Metal Combustion Productsmentioning

confidence: 99%

“…Before solving system (1), it is useful to evaluate the possibility of nucleation in one of the limiting regimes, which, following [4], will be called rapid and slow nucleation. A convenient criterion of the "rapidity" of nucleation is the ratio…”

Section: Nucleation Rate Of Metal Combustion Productsmentioning

confidence: 99%

“…In the first stage (nucleation) nuclei of a new phase are formed. This occurs by homogeneous [4][5][6], heterogeneous [7,8] or chemical [9] nucleation of gas-phase or vapor-phase combustion products of the metal particles. The second stage (coagulation) involves the rapid growth of the particles due to a sharp increase in the probability of particle collisions.…”

Section: Introductionmentioning

confidence: 99%

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Formation of condensed combustion products in metal dust flames: Nucleation stage

Poletaev

2015

Combust Explos Shock Waves

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The nucleation of the ionized combustion products of small (d 10 ≈ 5 μm) particles of Al, Mg, Zr, Fe, and Ti under laminar dust flame conditions at atmospheric pressure is considered in an isothermal approximation. It is shown that under conditions close to the experimental ones, the condensation of the products of gas-phase combustion of these metals is "rapid." Description of the "rapid" nucleation regime requires a nonstationary approach and knowledge of the kinetics of nucleation of the condensed phase and does not need a detailed analysis of the influence of environmental parameters on the free energy of formation of small nuclei. It is shown that the characteristic nucleation time of the gas-phase combustion products of metal particles is several orders of magnitude smaller than the residence time of the products in the combustion zone of the flame dust. This allows coagulation to be considered as the basic process which determines the degree of dispersion of primary particles of the metal combustion products.

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Section: Nucleation Rate Of Metal Combustion Productsmentioning

confidence: 99%

Section: Nucleation Rate Of Metal Combustion Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of condensed combustion products in metal dust flames: Nucleation stage

Poletaev

2015

Combust Explos Shock Waves

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“…This effect can be estimated by assuming that the coagulation of like-charged particles practically ceases when k 00 /k ++ < = e. Then equation k ++ = k 00 exp(-U n /k B t g ) leads to the inequality , which can be used to estimate the size of the aerosol particles depending on the characteristics of the medium [12].…”

Section: Specifi Cities Of the Ionized Aerosol Coagulationmentioning

confidence: 99%

“…[1] According to [12] For electrically neutral molecules K~10 -45 m 6 /s [13]. The presence of gas phase molecular ions can signifi cantly affect the value b, and, therefore, a constant of the triple collisions (4).…”

Section: Nucleation In the Ionized Dusty Fl Amesmentioning

confidence: 99%

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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Kinetics of Cluster Formation and Growth in the Process of Isothermal Condensation

Gordiet︠s︡

Shelepin

Shmotkin

1985

Rarefied Gas Dynamics

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Present State of the Theory of Homogeneous Nucleation

Cited by 43 publications

References 3 publications

Formation of condensed combustion products in metal dust flames: Nucleation stage

Formation of condensed combustion products in metal dust flames: Nucleation stage

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

Kinetics of Cluster Formation and Growth in the Process of Isothermal Condensation

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