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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Bondarenko А. O. Theoretical bases of pulp suction process in the shallow dredge underwater face [Електронний ресурс] / А. O. Bondarenko // Науковий вісник Національного гірничого університету. - 2018. - № 3. - С. 22–29. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_3_5 Purpose. To develop a mathematical model of the process of interaction of the shallow dredge suction pipe with solid particles and formation of the underwater face. Methodology. To describe the motion of a fluid flow involving solid particles in the underwater face of a single suction pipe, the continuity equation for an ideal fluid in polar coordinates is applied. The solution of the differential equation in general form is fulfilled. The motion of solid particles and the formation of an underwater face of the suction pipe are considered as a result of the difference in pressures below and above the particle. Findings. A mathematical description of the process of movement of a carrier flow carrying solid particles in the underwater surface suction zone of a single suction pipe is performed, using the continuity equation for an ideal fluid, written in polar coordinates. The interaction of the suction pipe with the pulp flow is described in the form of an axisymmetric process with a function of the medium density constant in time. The motion of a solid particle in an underwater face of a suction pipe is considered as a function of the difference in pressures below and above the particle. Based on the fact of low velocities of the suction flow moving, an expression is obtained for calculating the suction radius of solid particles and determining the boundary of the erosion zone when the soil is sucked in the underwater face of the suction pipe. The determining effect of the radial motion of the suction flow and the centrifugal force insignificance is taken into account. The construction of an underwater surface erosion zone of a single suction pipe in the form of surfaces of the erosion zone boundary and the boundary of the suction zone of the suspended soil composed of quartz particles by the size 0,16 mm at a suction efficiency of 800 m<^>3 | ||
| 2. |
Bondarenko А. O. Modeling of interaction of inclined surfaces of a hydraulic classifier with a flow of solid particles [Електронний ресурс] / А. O. Bondarenko // Науковий вісник Національного гірничого університету. - 2018. - № 4. - С. 13-20. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_4_4 Purpose. Development of a mathematical model of the interaction process of a solid particle driven by a high-speed head of a carrier medium with an inclined surface of a hydraulic classifier. Methodology. The theory of granular material single particles transfer by a two-phase heterogeneous flow in the boundary region between the inclined surface of the classification apparatus and the aqueous medium is applied. The interaction of a solid particle with an inclined surface under the influence of the speed head of an expanding carrier stream, as well as gravity, Archimedes, friction, and environmental resistance is considered. Findings. A mathematical simulation of the interaction of solid particles with an inclined surface is performed under the influence of the speed head of the carrier medium. Three characteristic modes of particle motion are considered: the surface is horizontal, inclined downward, inclined upward. As a result of the development of the process model of interaction between the flowing part of the new technical level classifier, formed by dissimilar surfaces, with solid particles washed by a passing flow of the carrier medium, regularities in the influence of the slope angle of the classifier flowing part surface on the parameters of the solid particle equilibrium state are formulated. Analytical dependencies are obtained to determine the characteristic velocities of the carrier medium flow sufficient for the equilibrium of a solid particle. It has been established that the impact on a solid particle located on the classifier inclined surface with a carrier flow whose speed is proportional to the surface slope angle, the coefficient of sliding friction, the characteristic diameter, will allow it to keep its equilibrium. Originality. Analytical dependencies are obtained to determine the characteristic velocities of the carrier medium motion required for the equilibrium state of the particles deposited on the inclined surface of the classification apparatus. Practical value. Analytical dependencies are obtained to determine the medium flow velocity which carries solid particles from the inclination angle of the classification apparatus flowing part wall. The established dependencies make it possible to justify the rational angles of the surfaces slope that form the flowing part of the horizontal classifiers and other classification apparatus used for the gravitational processing of granular materials. | ||
| 3. |
Bondarenko А. O. Comprehensive solution of recycling waste from stone processing industry [Електронний ресурс] / А. O. Bondarenko, R. P. Naumenko // Науковий вісник Національного гірничого університету. - 2019. - № 4. - С. 96-101. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2019_4_18 Purpose. Development of integrated technological solutions for utilization, accumulation and processing of wastes of the stone-processing industry with the production of marketable products with commercial value. Methodology. Technological solutions have been applied for separate utilization, transportation, storage and processing of granular waste of the stone-processing industry in accordance with their initial size. Findings. The technological rationality of separate delivery and warehousing to temporary warehouses in the form of storage pits no more than 2,5 m high (with site arrangement between them of large-scale waste rubbish and medium and small stone cuttings) by specialized dump trucks equipped with grabbing petrol buckets and dump-shaped reinforced bodies is substantiated. The technology of the preparation of oversized ra materials for further grinding using crushing equipment on a mobile chassis is described, using hydraulic hammers as a hydraulic excavator attachment. The rationality of the application of the technology for the collection, transportation and drainage of primary sludge by means of specialized automobile chassis-slurry trucks equipped with a mobile slurry container was substantiated. The peculiarities of two-stage processing of primary sludge i considered with the provision of their drainage first in Mobile Slurry Containers, then on secondary drainage sites and final cleaning from fine-dispersed impurities and the receipt of the commercial product in the form of artificial sand by washing. As a result of experimental and industrial testing and testing of the technology of the mobile slurry container filling, the technological rationality of the use of mobile slurry containers is determined. Originality. For the first time, a technology of recycling and two-stage sequential processing of primary sludges, which are man-made waste of stone-making production with deriving a commercial product in the form of artificial sand, is developed. Practical value. Research and industrial testing of the technology of the mobile slurry container filling with sludge with the subsequent washing of the drained granular material has been performed. The performed research studies allowed quantifying the technological rationality of two-stage processing of primary sludge using mobile slurry containers and gravity hydraulic classifiers. | ||
| 4. | 
Bondarenko А. Substantiation of the parameters of the erosion jet underwater face [Електронний ресурс] / А. Bondarenko, O. Shustov // Збірник наукових праць Національного гірничого університету. - 2020. - № 60. - С. 38-48. - Режим доступу: http://nbuv.gov.ua/UJRN/znpngu_2020_60_6 | ||
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