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Bobrovskaya A.I.,Institute of Powder Metallurgy | Stepanenko D.A.,Belarusian National Technical University | Minchenya V.T.,Belarusian National Technical University
AIP Conference Proceedings | Year: 2012

The article presents results of experimental and theoretical studies of behaviour of granular media (powder materials) in airborne ultrasonic field created by flexurally-vibrating ring-shaped waveguide with resonant frequency in the range 20-40 kHz. Experiments show that action of acoustic radiation forces results in formation of ordered structures in the form of ultrathin walls (monolayers) with number corresponding to the number of ring nodal points. Action of secondary radiation forces (König forces) results in formation of collateral (secondary) walls situated nearby primary walls. Experimental observations are compared with results of modelling of acoustic radiation force field inside the ring by means of COMSOL Multiphysics and MathCad software. Results of the studies can be used in development of devices for ultrasonic separation and concentration of particles as well as for formation of ordered monolayers from spherical particles. © 2012 American Institute of Physics. Source


Shelepova E.,Tomsk Polytechnic University | Vedyagin A.,Tomsk Polytechnic University | Sadykov V.,Novosibirsk State University | Mezentseva N.,Novosibirsk State University | And 4 more authors.
Catalysis Today | Year: 2016

This paper presents results of theoretical and experimental research concerning synthesis of multilayer asymmetric oxygen-permeable membrane and its application for partial oxidation of methane. The membrane is based on macroporous Ni-Al foam substrate with three layers of perovskite-fluorite nanocomposites with graded (meso-micro) porosity, thin dense MnFe2O4-Ce0.9Gd0.1O2 layer and porous layer of LaNi0.9Pt0.1O3/Pr0.3Ce0.35Zr0.35O2-x catalyst. Testing of membrane in methane partial oxidation process demonstrates a good and stable performance. The mathematical modeling of the methane partial oxidation process in the catalytic membrane reactor has been provided. The developed model was applied to find the process (temperature, gas flow rates, etc.) and membrane (pore diameter of porous layer, thickness of porous layer) parameters corresponding to highest methane conversion and syngas selectivity. © 2016 Elsevier B.V. All rights reserved. Source


Kuznechik O.O.,Institute of Powder Metallurgy | Min'Ko D.V.,Belarusian National Technical University | Belyavin K.E.,Belarusian National Technical University | Grigor'Ev E.G.,National Research Nuclear University
Journal of Engineering Physics and Thermophysics | Year: 2013

We have substantiated the phenomenological model of pressure distribution in a powder in the process of electricimpulse sintering taking place under conditions of uniaxial two-sided elastic moulding called prepressing. We recommend using the developed procedure of modeling in calculations related to the optimization of the regimes of electric-impulse sintering that ensure obtaining permeable powder materials with a relatively uniform porous structure. © 2013 Springer Science+Business Media New York. Source


Sosnovskiy I.A.,National Academy of Sciences of Belarus | Kurilenok A.A.,National Academy of Sciences of Belarus | Belotserkovskiy M.A.,National Academy of Sciences of Belarus | Kuznechik O.O.,Institute of Powder Metallurgy | Grigorev E.G.,National Research Nuclear University MEPhI
Welding International | Year: 2016

The method of induction centrifugal surfacing of a charge based on tin bronze powders of medium dispersion with the addition of finely dispersed boehmite, which is an intermediate product in the production of the nanodispersed modification agent (α-Al2O3), is described. Its characteristic feature is that it can be produced in the surfacing conditions resulting in the chemical transformation of the intermediate product present in the charge to the nanodispersed modification agent followed by its uniform distribution in the liquid phase coating. The results of metallographic studies and tribotechnical tests of these coatings are presented. The experiments were carried out to determine the optimum (2–3%) boehmite content of the charge resulting in the highest parameters of antifriction and wear resistance properties of the coatings based on tin bronze after induction centrifugal surfacing. © 2016 Informa UK Limited, trading as Taylor & Francis Group. Source


Sadykov V.,Novosibirsk State University | Mezentseva N.,Novosibirsk State University | Simonov M.,Novosibirsk State University | Smal E.,Novosibirsk State University | And 13 more authors.
International Journal of Hydrogen Energy | Year: 2015

Main features of structured catalysts performance in bio-fuels reforming into syngas at lab-scale and pilot-scale levels using specially designed reactors and kinetic installations allowing to broadly tune the operational parameters are presented. Effects of the nature of nanocomposite active component comprised of Ru + Ni nanoparticles on bulk/alumina-supported perovskite or Mn-Cr-O spinel, type of substrate (Ni-Al alloy and SiC(Al2O3)/Al-Si-O foam substrates, Fechraloy microchannel plates or gauzes protected by thin corundum layer), type of fuel (natural gas, ethanol, acetone, ethyl acetate glycerol), feed composition and temperature on yield of syngas/byproducts and performance stability are considered. The best performance in real feeds with syngas yield approaching equilibrium at short contact times without any heat/mass transfer effects along with a high thermochemical stability were demonstrated for catalyst on heat-conducting microchannel substrate. Oxygen addition to the feed in optimized amounts allows to suppress coking and stabilize performance even for the case of such reactive fuel as glycerol only slightly affecting syngas yield. © 2015 Hydrogen Energy Publications, LLC. Source

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