Browsing by Author "Pertsevyi, Vitalii"

Now showing 1 - 3 of 3
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    Mathematical Modeling of Heating of Coal Particle Within the Space between Electrodes of Arc-Heating Reactor
    (EDP Sciences, 2020) Zhevzhyk, Oleksandr V.; Kholiavchenko, Leonid; Davydov, Serhii; Potapchuk, Iryna Yu.; Kabakova, Liudmyla; Gupalo, Olena V.; Pertsevyi, Vitalii; Morozova, Nataliia
    EN: A mathematical model of heating of coal particles that move in the initial section of a submerged gas jet within the space between electrodes of reaction chamber of arc-heating reactor is created. The model takes into account convective heat transfer and heat transfer by radiation from a sphere (particle) – circle (anode) system. The temperatures of particles on mechanical trajectory are obtained depending on particle diameters and the initial coordinate of nozzle leaving.
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    Mathematical Modeling of Rocks Plasma Disintegration Process at Borehole Reaming
    (IOP Publishing Ltd, 2023) Potapchuk, Iryna Yu.; Zhevzhyk, Oleksandr V.; Kholiavchenko, Leonid; Pertsevyi, Vitalii; Bosyi, Dmytro O.; Drubetskaya, Tanya; Potapchuk, Anna
    ENG: The mathematical model of thermal disintegration of rocks during the reaming of boreholes, which takes into account the compatibility of the thermogas dynamic problem for a high-temperature heat transfer agent and the thermal problem for the rock heated by this heat transfer agent, has been developed. The mathematical model is based on the laws of conservation of mass, quantity of motion and energy and takes into account the dependences for determining the thermal stresses and the temperature of brittle fracture of rocks. As a result of solving the equations of the mathematical model, the temperature distribution in the rock mass (magnetite quartzite) during heating in the process of borehole plasma reaming and productivity of the borehole plasma reaming process are obtained. Calculated and experimentally determined productivity of the process of plasma reaming of the borehole were compared.
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    Numerical Modeling of the Thermal Characteristics of a Fan Spray Cooling Tower
    (IOP Publishing, 2024) Zhevzhyk, Oleksandr V.; Potapchuk, Iryna Yu.; Pertsevyi, Vitalii; Bosyi, Dmytro O.; Biriukov, Dmytro; Shevchenko, Serhii
    ENG: The work constructs a mathematical model of the heat and mass transfer process in a spray cooling tower. The mathematical model consists of the equations of motion and heat and mass transfer of water droplets and the equations of thermal and material balance of moist air, considers the polydispersity of the droplet flow and allows to calculate the cooling capacity of the cooling tower depending on the parameters of the droplet flow. The mathematical model is confirmed by the results of industrial tests of irrigation-free cooling towers. The simulation results show that the cooling capacity of a spray fan cooling tower significantly depends on the atomization dispersion and the height of the water cutting nozzles. Reducing the average diameter of the droplet flow to less than 2 mm and increasing the height of the nozzles H > 4...5 m make it possible to achieve the cooling performance of known cooling towers with nozzle. The mathematical model allows to calculate the cooling capacity of the cooling tower and determine the necessary individual parameters of the droplet flow for each type of equipment and consumers for which the specific energy costs for cooling is minimal.