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  • 1
    Language: English
    In: High Temperature, 2017, Vol.55(2), pp.183-190
    Description: We investigate the mechanisms of formation and death of negative ions in aluminum-water plasma, their role in kinetics of its ionization and recombination, and influence on plasma parameters. Negative ions, in contrast to the positive, do not in fact participate in the heterogeneous processes and require, to enhance their influence on the plasma parameters, first, high electron temperatures (~1.5 eV and higher) and, second, low n e and [Al] concentrations: in this way, they make a great contribution to the H 2 O dissociation at the expense of the electron energy (2–8 electrons per a molecule). We show that, even in the most favorable conditions at low H and O concentrations within the experimental temperature range, T e = 0.6–1 eV, the negative ions do not, in fact, influence the Al concentration and, in the operation reactor zone, the other parameters, except for the microparticle concentration. We reveal the source, important for the spectral diagnostics of the atomic emission, of recombination populating of the excited Al levels. The main negative ion (OH – ) is established. We have concluded the impossibility of its use in order to optimize the operation of the aluminum-water plasma-chemical reactor.
    Keywords: Ionization;
    ISSN: 0018-151X
    E-ISSN: 1608-3156
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  • 2
    Language: English
    In: High Temperature, April, 2012, Vol.50(2), p.292(3)
    Description: Byline: V. I. Gorbatov (1,2), V. F. Polev (1,2), I. G. Korshunov (1,2), S. G. Taluts (1,2) Abstract: The results of the thermal diffusivity measurements for pure iron within the temperature range from 830 K up to 1820 K obtained in automated mode by the dynamic plane temperature wave method have been presented. Author Affiliation: (1) Ural State Mining University, Ul. Kuibyshave 30, Yekaterinburg, 620144, Russia (2) Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Pervomaiskaya ul. 91, Yekaterinburg, 620219, Russia Article History: Registration Date: 26/04/2012 Received Date: 03/03/2011 Online Date: 27/04/2012 Article note: Original Russian Text (c) V.I. Gorbatov, V.F. Polev, I.G. Korshunov, S.G. Taluts, 2012, published in Teplofizika Vysokikh Temperatur, 2012, Vol. 50, No. 2, pp. 313--315.
    Keywords: Iron (Metal) -- Thermal Properties
    ISSN: 0018-151X
    E-ISSN: 16083156
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  • 3
    Language: English
    In: High Temperature, 2014, Vol.52(1), pp.1-11
    Description: Plasma excited by a longitudinal pulse-periodic discharge in a mixed flow of a buffer gas (Ar), oxidizer (H 2 O), and aluminum dust is studied. The salient features of its kinetics are the atomic and molecular electronic channels of Al atom transformation, which were not taken into account earlier. They accelerate not only the oxidation process but also aluminum vaporization because the excitation and ionization energies are finally released on the surface of aluminum particles. This work is devoted to experimental and theoretical analysis of these channels.
    Keywords: Plasma Physics ; Ionization;
    ISSN: 0018-151X
    E-ISSN: 1608-3156
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  • 4
    Language: English
    In: High Temperature, 2015, Vol.53(1), pp.21-26
    Description: The kinetic model of gas and heterophase plasma-chemical processes taking place in the working zone of a reactor is extended to the evaporation of aluminum from the surface of microparticles, which results in the mean value of the flux density and evaporation time. It is shown that the balance of aluminum atoms in the working zone is determined by the heterogeneous processes of evaporation of low-melting aluminum and adhesion of refractory oxides, which is the dominant aluminum-containing component of the plasma. The time of flight of microparticles through the working zone in a gas-discharge aluminum-water reactor with a pumping system is experimentally found, which, under the conditions created, coincides with the burnout time of aluminum microparticles. The mechanisms of burnout and reproduction of microparticles (evaporation and microexplosions) are determined, reducing the average size of microparticles in the working zone from 100 to 10 μm.
    Keywords: Oxides;
    ISSN: 0018-151X
    E-ISSN: 1608-3156
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  • 5
    Language: English
    In: High Temperature, 2012, Vol.50(2), pp.292-294
    Description: The results of the thermal diffusivity measurements for pure iron within the temperature range from 830 K up to 1820 K obtained in automated mode by the dynamic plane temperature wave method have been presented.
    ISSN: 0018-151X
    E-ISSN: 1608-3156
    Source: Springer Science & Business Media B.V.
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  • 6
    Language: English
    In: High Temperature, 2014, Vol.52(5), pp.621-626
    Description: A kinetic model of gas-phase and heterophase plasma-chemical processes taking place in a gas-discharge aluminum-water reactor with a pumping system is proposed. The model leads to a relatively simple system of equations that covers a great variety of reactions and offers an analytical solution for the composition of plasma with microparticles using experimental data. Along with the cycle of reactions typical for these heterogeneous mixtures, two more closed cycles of aluminum transformations are revealed in the plasma: atomic and molecular, generated by a stepwise ionization of Al and AlO by plasma electrons. The rate of aluminum oxidation and hydrogen formation through the molecular channel under the experimental conditions was comparable to the rate of heterogeneous processes. The inefficiency of the equilibrium oxidation mode is demonstrated.
    Keywords: Hydrogen ; Ionization ; Aluminum Compounds ; Oxidation-Reduction Reactions;
    ISSN: 0018-151X
    E-ISSN: 1608-3156
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  • 7
    Language: English
    In: High Temperature, 2018, Vol.56(4), pp.605-608
    Description: The near-threshold spectral region of radiation of helium arc plasma under atmospheric pressure and at an electron temperature of 3 eV was investigated. Under these conditions, plasma is ionizationally nonequilibrial due to the overwhelming predominance of recombination on a wall over the bulk recombination. It is shown that the occupancies of atomic levels n ≥ 4 rapidly decrease; therefore, no spectral lines from levels n ≥ 7 are observed. This fact is related to the destruction of excited atomic states in the quasi-static (ion) plasma microfield (mainly, in the nearest-ion field).
    Keywords: Heliumplasma ; Atmosphärischer Druck ; Rekombination ; Spektralbereich ; Strahlung ; Spektrallinie ; Zerstörung ; Elektronentemperatur ; Physics;
    ISSN: 0018-151X
    E-ISSN: 1608-3156
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  • 8
    Language: English
    In: High Temperature, July, 2013, Vol.51(4), p.482(4)
    Description: Byline: V. I. Gorbatov (1,2,3), V. F. Polev (1,2,3), V. P. Pilugin (1,2,3), I. G. Korshunov (1,2,3), A. L. Smirnov (1,2,3), S. G. Talutz (1,2,3), D. A. Brytkov (1,2,3) Abstract: The results of thermal diffusivity measurements of pure niobium, titanium, and zirconium with the standard, submicro-, and nanocrystalline structures at high temperatures are presented the results were obtained in the automated regime by the dynamic method of plane temperature waves. Author Affiliation: (1) Ural State Mining University, Kuibyshev ul. 30, Yekaterinburg, 620144, Russia (2) Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, ul. Amundsena 106, Yekaterinburg, 620016, Russia (3) Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. Sofia Kovalevskaya 18, Yekaterinburg, 620219, Russia Article History: Registration Date: 12/08/2013 Received Date: 13/09/2012 Online Date: 14/08/2013 Article note: Original Russian Text (c) V.I. Gorbatov, V.F. Polev, V.P. Pilugin, I.G. Korshunov, A.L. Smirnov, S.G. Talutz, D.A. Brytkov, 2013, published in Teplofizika Vysokikh Temperatur, 2013, Vol. 51, No. 4, pp. 539--542.
    Keywords: Zirconium -- Thermal Properties
    ISSN: 0018-151X
    E-ISSN: 16083156
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  • 9
    Language: English
    In: High Temperature, 2017, Vol.55(3), p.380(6)
    Description: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1134/S0018151X17020183 Byline: A. L. Smirnov (1), S. G. Taluts (1), A. D. Ivliev (2), V. I. Gorbatov (1), V. F. Polev (1), I. G. Korshunov (1,3) Abstract: Experimental results are presented on the temperature-concentration dependences of thermal diffusivity, specific electrical resistivity, and thermal conductivity of zirconium-niobium alloys at high temperatures. Author Affiliation: (1) Ural State Mining University, Ekaterinburg, 620144, Russia (2) Russian State Vocational Pedagogical University, Ekaterinburg, 620012, Russia (3) Institute of Thermal Physics, Ural Branch of RAS, Ekaterinburg, 620016, Russia Article History: Registration Date: 20/06/2017 Received Date: 25/05/2015 Online Date: 24/06/2017 Article note: Original Russian Text [c] A.L. Smirnov, S.G. Taluts, A.D. Ivliev, V.I. Gorbatov, V.F. Polev, I.G. Korshunov, 2017, published in Teplofizika Vysokikh Temperatur, 2017, Vol. 55, No. 3, pp. 396--401.
    Keywords: Alloys – Electric Properties ; Alloys – Thermal Properties ; Thermal Conductivity – Electric Properties ; Thermal Conductivity – Thermal Properties ; Electrical Conductivity – Electric Properties ; Electrical Conductivity – Thermal Properties ; Zirconium – Electric Properties ; Zirconium – Thermal Properties
    ISSN: 0018-151X
    E-ISSN: 16083156
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  • 10
    Language: English
    In: High Temperature, 2016, Vol.54(2), pp.294-296
    Description: Measurement data are given for the thermal diffusivity of Zr–2.5% Nb and Zr–50% Nb alloys both with the usual polycrystalline structure and with submicro- and nanocrystalline structures at high temperatures, which were determined in the automated mode using the dynamic technique of plane temperature waves.
    Keywords: Physics ; Atoms and Molecules in Strong Fields, Laser Matter Interaction ; Materials Science, General ; Classical Continuum Physics ; Physical Chemistry ; Industrial Chemistry/Chemical Engineering ; Physics;
    ISSN: 0018-151X
    E-ISSN: 1608-3156
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