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Your search keyword '"Strizhak, Pavel A."' showing total 614 results
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614 results on '"Strizhak, Pavel A."'

35. Effect of Surfactants on the Synthesis and Dissociation of Gas Hydrates.

Author

Misyura, Sergey, Morozov, Vladimir, Strizhak, Pavel, Shlegel, Nikita, and Donskoy, Igor

Subjects
METHANE hydrates, GAS hydrates, COMBUSTION gases, HEAT flux, CARBON dioxide
Abstract

The synthesis and dissociation of methane hydrate and carbon dioxide hydrate were studied. Nonflammable gas hydrates can be used to extinguish flames in confined spaces. To increase the extinguishing efficiency, it is necessary to increase the dissociation rate (gas release rate) by using surfactant. The work investigates gas hydrates synthesized using sodium dodecyl sulfate (SDS). Experimental studies were carried out in wide ranges of surfactant concentration, the number of the stirrer revolutions and the initial water volume. To achieve the maximum rate of synthesis and dissociation, optimization of the specified parameters was performed. The influence of the key parameters on the dissociation rate was investigated experimentally and theoretically. The novelty of the work lies in solving a complex of interrelated tasks on the synthesis and dissociation of gas hydrate. It is shown that in order to achieve the maximum dissociation rate of carbon dioxide hydrate, it is necessary to optimize the following parameters: the diameter of the particles and their porosity, the porosity of the layer and the external heat flux. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Surface deformation of moving droplets of slurry fuels.

Author

Kuznetsov, Geniy, Strizhak, Pavel, Volkov, Roman, and Vysokomornaya, Olga

Subjects
*DEFORMATION of surfaces, *COAL mine waste, *RELATIVE velocity, *AIR jets, *COMBUSTION chambers, *SLURRY, *JET fuel
Abstract

Experimental research findings are reported on the characteristics of surface transformation of droplets of promising fuel slurries in the air, as they move at subsonic velocities typical of combustion chambers of power plants. The main components of the fuels were water, coal processing waste, and coal. Typical shapes of droplets and the duration of their deformation cycles were identified. Droplets containing more than 70% of the solid phase remained practically undeformed. The lowest relative velocities of droplets leading to their fragmentation were determined. The key characteristics of secondary droplets (their number, sizes, velocities, and surface area of liquid) were calculated on the basis of the experimental findings. These characteristics were compared with those of initial droplets. Disruption conditions in the chosen range of the gas jet pressure (P ≤ 6 bars) can only be provided for fuel slurry droplets containing less than 60% of a coal component. The effect of a group of factors on deformation characteristics was identified. These include air jet and droplet velocities, droplet sizes, temperature, concentration, and type of components and additives. Approximation equations were derived for the mathematical description of the experimental data. Using certain criteria, the conditions necessary and sufficient for the disruption of water–fuel slurries on impact with an air jet were estimated. [ABSTRACT FROM AUTHOR]

Published
2024
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