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11.
We have performed an experimental study of the evaporation intensity for droplets in atomized-liquid flow moving through a flame of fixed height. Integral characteristics of the atomized-liquid evaporation process were evaluated. Evaporation of two water droplets moving sequentially one after the other through high-temperature combustion products is analyzed. A comparison of obtained data with available theoretical predictions is given. 相似文献
12.
13.
D. V. Antonov G. V. Kuznetsov P. A. Strizhak 《Journal of Engineering Thermophysics》2016,25(3):337-351
Characteristic temperatures and concentrations of a vapor–gas mixture in a wake of water droplets moving through combustion products (initial temperature 1170 K) were determined using the Ansys Fluent mathematical modeling package. We investigated two variants of motion: motion of two droplets (with sizes from 1 mm to 3 mm), consecutive and parallel, and motion of five staggered droplets. The influence of the relative position of droplets and also of distances between them (varied from 0.01 mm to 5 mm) on temperatures and concentrations of water vapor was established. The distances determine the relation between the evaporation areas and the total volume occupied by a droplet aggregate in the gas medium. The results of modeling for conditions that take into account vaporization on the droplet surface at average constant values of evaporation rate and also with consideration of the change in the latter, depending on the droplet temperature field, are compared. We determined conditions under which the modeling results are comparable for the assumption of a constant vaporization rate and with regard to the dependence of the latter on temperature. The earlier hypothesis on formation of a buffer vapor layer (“thermal protection”) around a droplet, which decreases the thermal flow from the external gas medium, was validated. 相似文献
14.
The motion of spray water through a counter flow of high-temperature gases is experimentally studied on a macroscopic level using optical techniques for diagnostics of two-phase liquid-gas and vapor-liquid flows. It is found that the initial temperature, concentration of typical impurities, and dispersity of water influence the component composition of the forming gas-vapor-droplet mixture. The integral characteristics of evaporation of solitary droplets with initial sizes (conditional characteristic radii) of 3–5 mm and a spray water flow with droplets less than 0.5 mm across through a high-temperature gaseous medium are compared. 相似文献
15.
R. S. Volkov G. V. Kuznetsov V. E. Nakoryakov P. A. Strizhak 《Journal of Applied Mechanics and Technical Physics》2017,58(5):889-894
Evaporation rates of water droplets in high-temperature gases were experimentally determined using high-speed video recording cameras and low-inertia thermocouples (for heated air flow as an example). The experiments were carried out for droplets of initial size (radius) 1–3 mm at an air temperature of 500–1000 K. Dependences of the evaporation rate of water droplets on time and gas temperature were obtained for various initial droplet sizes. 相似文献
16.
O. V. Vysokomornaya G. V. Kuznetsov P. A. Strizhak 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(4):668-673
The processes of heat and mass transfer with phase transitions and chemical reactions in the ignition of liquid fuel by a
local source of heating, a hot metal particle, under conditions of fuel burnout are studied. The influence of liquid fuel
burnout on the ignition characteristics is analyzed, and the results of investigation of the extent of influence of this factor
for solid and liquid condensed materials under conditions of local heating are compared. 相似文献
17.
The mechanism for the formation of C2+ paraffins differs from the mechanism for the formation of methane. While methane is obtained due to hydrogenation of methyl
groups, C2+ hydrocarbons are formed as the result of the conversion of alkyl intermediates into hydroalkene intermediates, which can
decompose to give olefins or undergo hydrogenation to give saturated hydrocarbons.
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Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 44, No. 3, pp. 175–179, May–June, 2008. 相似文献
18.
P. A. Strizhak 《Journal of Engineering Thermophysics》2011,20(2):211-216
Peculiarities of natural convection in a liquid condensed substance at ignition by a typical local energy source, that is,
a small hot metal particle, are numerically investigated. The proposed model takes into account the whole complex of the main
processes of heat and mass transfer with phase transitions, chemical reaction, and hydrodynamic processes during interaction
between a liquid substance and a source with a limited energy capacity. The influence of convective streams in liquid during
the ignition delay time on the process characteristics is analyzed. 相似文献
19.
Andrii I Trypolskyi Tetyana M Gurnyk Peter E. Strizhak 《Chemical physics letters》2008,460(4-6):492-494
We present an approach establishing a relation between the activation energy of heterogeneous catalytic processes and the fractal dimension of a catalyst. The approach is verified by experimental study of the CO oxidation on various porous silica and zeolite NaX. The fractal dimension of a catalyst (DF) was calculated from the nitrogen adsorption isotherms. Our results indicate that the activation energy increases with increasing the fractal dimension of a catalyst. We show a good correspondence between theoretical and experimental results. 相似文献
20.
I. B. Bychko E. Yu. Kalishin P. E. Strizhak 《Theoretical and Experimental Chemistry》2011,47(4):219-224
Fe@Fe3O4 nanoparticles of controlled size, deposited on carbon nanotubes, were obtained by deposition from colloidal solutions. It
was shown that the size and size distribution of the nanoparticles do not change during deposition on carbon nanotubes. By
temperature-programmed reduction with hydrogen it was established that the temperatures at the beginning of reduction of the
Fe@Fe3O4/CNT samples do not depend monotonically on the size of the deposited nanoparticles. 相似文献