Analysis of model relations for turbulent heat diffusion as applied to the calculation of wake flows

An experimental test of the known approximations is made and a new relation is proposed for turbulent diffusion of heat or of a passive admixture.Translated from Inzhererno-Fizicheskii Zhurnal, Vol. 51, No. 6, pp. 896–902, December, 1986.     

Temperature fluctuation balance in an axisymmetric turbulent wake

Results of experiments conducted in the thermal wake behind an axisymmetric body are used to evaluate the radial profiles of different terms of the balance equation for the mean square of temperature fluctuations.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 50, No. 2, pp. 181–187, February, 1986.     

Kinetic Oscillations on nm-Sized Catalyst Particles: NO Reduction by CO on Pt

We present Monte Carlo simulations of kinetic oscillations in the NO–CO reaction occurring due to the interplay of catalytic steps including autocatalytic NO dissociation. The lattice size is varied from 100 × 100 to 10 × 10 in order to mimic nm-sized catalyst particles. More or less regular oscillations are found for the sizes down to 15 × 15. In combination with similar results?obtained earlier for two other models describing CO oxidation accompanied by oxide formation and surface restructuring, this finding forms one of first firm quantitative ingredients of the theory of oscillatory kinetics on supported catalysts.     

Nature of the growth of Al-Cu powder compacts during liquid-phase sintering

Conclusions Arresting the process of liquid-phase sintering of aluminum-copper system powder compacts by rapid cooling does not affect the character of the volume changes experienced by them during subsequent sintering under the same temperature conditions. In the growth stage a decrease in the crystal lattice parameter of aluminum and an appreciable broadening of an x-ray line have been observed, caused by the formation of aluminum base solid solutions. These findings bear out the hypothesis that the growth of aluminum-copper powder compacts above their eutectic melting point is mainly due to diffusion of copper from the liquid phase into aluminum particles.Translated from Poroshkovaya Metallurgiya, No. 5(305), pp. 16–19, May, 1988.