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Ksandopulo G.I.,Institute of Combustion Problems
International Journal of Self-Propagating High-Temperature Synthesis | Year: 2011

Potential possibility of using centrifugal forces for production of noble ferroalloys was demonstrated for aluminothermic systems taken as an example. Combustibility limits in the field of centrifugal forces were associated with the onset of adiabatic conditions for combustion due to acceleration of combustion front by melted metal particles returned into the reaction zone by centrifugal forces. © 2011 Allerton Press, Inc. Source


Mansurov Z.A.,Institute of Combustion Problems
Combustion, Explosion and Shock Waves | Year: 2012

This paper presents original results in the area of synthesis of fullerenes, carbon nanotubes, and superhydrophobic soot in hydrocarbon flames and data on the self-propagating hightemperature synthesis of nanomaterials obtained in recent years at the Institute of Combustion Problems. © 2012 by Pleiades Publishing, Ltd. Source


Ksandopulo G.I.,Institute of Combustion Problems
Russian Journal of Physical Chemistry B | Year: 2011

Based on the postulate of competition between two mechanisms of fuel conversion (low-temperature autocatalysis (A) and high-temperature thermal self-acceleration (T) in the flame front, a method for determining the degree of staging S of the flame of a given fuel-air mixture is proposed. Zones with prevalence of each of these mechanisms, the activity of which depends on the initial fuel concentration C0, temperature T0, and pressure P, are identified. A quantitative method for determining S consists in calculating the ratio of the maximum rates of fuel and oxygen consumption and water formation in zones A (AKi) and T (Ki) from mass-spectrometric analysis of the flame front. The S < 1 values correspond to the monofront (before bifurcation), whereas S > 1, to the bifront (after bifurcation). Bifurcation point arises as a result of the increase of the negative temperature coefficient (NTC) associated with the difference AKi - TKi = ε becoming positive, which is the criterion of occurrence of bifurcation. At ε ≤ 0, in the profiles of the rates of fuel and oxygen consumption and water formation, the NTC zone between zones A and T expands. At ε > 0, the monofront turns into a bifront. It was established that the effect of T 0 on the shape of the curves of the rates of formation and accumulation of other combustion products typical of zone T, except for O 2, fuel, and water, is small, if any. Experimental data on massspectrometric analysis of combustible mixtures of pentane with C0 = α = 1.4, 1.5, and 1.7 are for the first time presented. Results of calculations of S from previously published data on probing the front of flames C1-C6 hydrocarbon are presented. It is shown that S for all the flames is a smoothly varying function of C0 to the bifurcation point. The dependence of S on T0 is negative. Flames with the same values of S are identical. © Pleiades Publishing, Ltd., 2011. Source


Mansurov Z.A.,Institute of Combustion Problems
International Journal of Self-Propagating High-Temperature Synthesis | Year: 2011

The synthesis of fullerenes, carbon nanotubes, and superhydrophobic soot in hydrocarbon flames was briefly overviewed. © 2011 Allerton Press, Inc. Source


Mansurov Z.A.,Institute of Combustion Problems
Eurasian Chemico-Technological Journal | Year: 2011

Usage of combustion processes for production of target products is less common than the application of catalytic processes. However, there are known examples of production of carbon black, HCl, TiO2 etc. Some research work was done at the Institute of Combustion Problems (Almaty, Kazakhstan) consider the synthesis in flame of carbon nanomaterials: fullerenes, nanotubes and soot nanobeads with superhydrophobic surface. An alternative of fullerenes and nanotubes synthesis in arc discharge of graphite is the method using stationary hydrocarbon flames. Flame is a self-sustaining system in which the hydrocarbons can be precursors of carbon nanomaterials, and the heat released during combustion, is a parameters of the process control. It is known that PAH are nucleation centers of forming soot i.e. PAH can be converted into either soot or fullerenes. The formation of CNTs occurs in diffusion flames from the fuel side and is initiated by transition metals particles. The paper presents data on the formation of fullerenes and carbon nanotubes as well as soot with the superhydrophobic surface, obtained on nickel and silicon supports in benzene-oxygen and propane-oxygen diffusion flames. New results regarding the synthesis of superhydrophobic surface with a contact angle 135-175° have great practical interest as anti-corrosion additives to various materials. © 2011 al-Farabi Kazakh National University. Source

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