Browsing by Author "Starik, Alexander M."

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Numerical analysis of nanoaluminum combustion in steam
(2014-06-01)
Starik, Alexander M.
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Kuleshov, Pavel S.
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Sharipov, Alexander S.
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Titova, Nataliya S.
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Tsai, Chuen-Jinn
The comprehensive analysis of chain mechanism development in the Al-H2O system is performed on the base of novel reaction mechanism taking into account quantum chemistry studies of potential energy surfaces of the elementary reactions with Al-containing species and estimations of rate constants of corresponding reaction channels. As well the physical properties of Al-containing species involved in the reaction mechanism and needed for the calculation of their transport coefficients are reported. The developed reaction mechanism makes it possible to describe with reasonable accuracy the experimental data on ignition temperature in Al-O-2-Ar and Al-H2O systems and obtain the qualitative agreement with measured value of laminar flame speed. The two-stage regime of ignition in the Al-H2O reacting system was revealed both when the aluminum is in the liquid phase and when it comes into steam environment in the gas phase. It was shown that decreasing the ignition temperature one can increase the hydrogen yield in the combustion exhaust. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Theoretical evaluation of diffusion coefficients of (Al2O3)(n) clusters in different bath gases
(2014-04-24)
Sharipov, Alexander S.
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Loukhovitski, Boris I.
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Tsai, Chuen-Jinn
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Starik, Alexander M.
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環境工程研究所
The binary diffusion coefficients of two low lying isomers of (Al2O3)(n), n = 1...4, clusters in different bath gases, that most frequently met in the nature and in the technical applications: H-2, N-2, O-2, CO, H2O as well as their self-diffusion coefficients have been calculated on the basis of kinetic theory and dipole reduced formalism. The parameters of interaction potential have been determined taking into account the contributions of a dispersion, dipole-dipole and dipole-induced dipole interactions between alumina clusters and bath molecules. The dipole moments, polarizabilities and collision diameters of clusters have been obtained by using quantum chemical calculations of cluster structure. The approximations for temperature dependencies of diffusion coefficients for two low-lying isomers of each considered alumina clusters are reported. It is demonstrated that an account for the contributions of the second for each type of clusters does not affect substantially the value of net diffusion coefficient. The diffusion coefficients of the isomers of small (Al2O3)(n) clusters can differ notably in the case when their dipole moments are distinct and they interact with strongly dipole molecules.