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Борисевич, Валентин Дмитриевич

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Институт нанотехнологий в электронике, спинтронике и фотонике

Институт ИНТЭЛ занимается научной деятельностью и подготовкой специалистов в области исследования физических принципов, проектирования и разработки технологий создания компонентной базы электроники гражданского и специального назначения, а также построения современных приборов на её основе. Наша основная цель – это создание и развитие научно-образовательного центра мирового уровня в области наноструктурных материалов и устройств электроники, спинтроники, фотоники, а также создание эффективной инновационной среды в области СВЧ-электронной и радиационно-стойкой компонентной базы, источников ТГц излучения, ионно-кластерных технологий материалов.

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Борисевич

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Валентин Дмитриевич

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Только метаданные
Cost Evaluation for Production of Isotopes Based on Theory of Model Q-cascade 基于Q级联理论估算同位素生产的成本
(2020) Zeng, S.; Yu, H.; Lei, Z.; Borisevich, V. D.; Smirnov, A. YU.; Sulaberidze, G. A.; Борисевич, Валентин Дмитриевич; Смирнов, Андрей Юрьевич; Сулаберидзе, Георгий Анатольевич
© 2020, Editorial Board of Atomic Energy Science and Technology. All right reserved.Prior to making a decision to produce an isotope, it is necessary to investigate the economy of the production to understand and ensure its economic feasibility. A method of analyzing the production of a non-uranium isotope by centrifugation was presented in the paper. The relationship between the material recovery and the cascade relative total flow was obtained by using the theory of the model Q-cascade. Based on the data of the cost per unit SWU (separative work unit) openly available for uranium separation, to avoid involving many factors such as the separation unit cost and the personnel cost in the analysis, a simple formula for the cost analysis was derived under the assumption that the cost for separation was proportional to the scale of the production plant. The formula can be easily applied to the evaluation and optimization of the production cost of an isotope according to the material cost, unit separative cost for uranium separation, material recovery, etc. Taking the production of the lead isotope 208Pb as an example, the analysis process was explained. The results show that the cost evaluation is simple and easy to be carried out by using the method proposed here.
Только метаданные
Isotope separation of low boiling-point substances by plasma centrifuge with circulation
(2020) Whichello, J. V.; Borisevich, V. D.; Potanin, E. P.; Борисевич, Валентин Дмитриевич
© 2019, © 2019 Taylor & Francis. A new plasma centrifuge (PC) for isotope separation has been proposed. The physical and mathematical models of the processes taking place in the PC are presented. A partially ionized medium rotates by a high-frequency (HF) electromagnetic field. Simultaneously, axial circulation is excited by a traveling magnetic field(TMF) to provide an increase of the separation performance in an axial direction. By assuming that the plasma medium is weakly ionized, diffusion separation can be assumed to undergo processes that are similar to those in a neutral gas. Charged particles in the medium move due to an applied rotating HF field, transferring force action to the neutral gas. By including a heated chamber wall, the PC is capable of separating low-boiling substances, including the isotopes of alkaline and alkaline-earth elements.
Только метаданные
Comparison study of schemes for separation of intermediate isotope components
(2020) Zeng, S.; Smirnov, A.; Borisevich, V. D.; Sulaberidze, G. A.; Смирнов, Андрей Юрьевич; Борисевич, Валентин Дмитриевич; Сулаберидзе, Георгий Анатольевич
© 2019, © 2019 Taylor & Francis.This paper uses the Q-cascade model to investigate the separation performance of eight schemes, comprising variations of two single-cascades and two double-cascades, to separate an intermediate isotope component. Optimization determines the relationship between the minimum relative total flow and concentration for different concentration requirements of the intermediate component. The results show that single-cascade schemes are not efficient. Rather, the optimal scheme is a double-cascade scheme that uses a three-stream cascade and a cascade with two feeds and an intermediate withdrawal. The successful optimization of all schemes indicates that this approach can be generalized to optimize various multistep separation processes.
Только метаданные
Plasma Centrifuge with Crossed e × B Fields and Thermally Driven Countercurrent Flow
(2020) Potanin, E.; Whichello, J. V.; Borisevich, V.; Борисевич, Валентин Дмитриевич
© 1973-2012 IEEE.It is well established from gas centrifuge (GC) development that isotope separation in a rotating, multispecies gaseous medium increases with axial circulation of the rotating gas in a long separation chamber. This article aims at the development of a commercially viable plasma centrifuge (PC) for specific, nonuranium isotopes. The proposed model PC employs crossed constant radial electric and axial magnetic fields to provide radial separation of a partially ionized gas, combined with a thermal method to establish axial circulation in the rotating medium. The proposed thermal method creates an axial temperature gradient by cooling one end of the separation chamber. By calculation, the inclusion of circulation flow is shown to create axial redistribution of the target component concentration, increasing the longitudinal separation. An analysis of the hydrodynamic and thermal problems is performed for an extended end disk PC in the framework of the boundary layer theory. Radial velocity profiles of the conducting gas in the boundary layer are calculated with respect to the temperature ratio in the external flow ( $T_{1}$ ) and the disk surface ( $T_{0}$ ) for various Prandtl (Pr) numbers. The results demonstrate that for small values of the Pr number, cooling of an end surface within the PC separation chamber results in an intensive inflow of the conducting medium to the solid surface. It is shown that in a PC with crossed fields, cooling one of its ends achieves an effective multiplication of the separation effect along the length of the column.
Только метаданные
Three-Dimensional Flows in a Rotating Cylinder in the Presence of Turbulent Boundary Layers on End Disks
(2019) Borisevich, V. D.; Potanin, E. P.; Борисевич, Валентин Дмитриевич
© 2019, Pleiades Publishing, Ltd.An analytical model for calculating a viscous incompressible fluid flow in a rotating cylinder with a braking lid and the formation of turbulent boundary layers on the end surfaces is presented. The analysis is made with account for all nonlinear inertial terms in the equations of motion, within the framework of Loitsyanskii's integral relations. The approximate velocity profiles in the boundary layers are preassigned in accordance with the empirical 1/7 law. The main flow is subdivided into an inviscid quasisolid core and a lateral layer, where almost the entire upward part of a circulatory flow is concentrated. The unknown angular velocity of the core and its radial boundary are evaluated from the balance between the moments of the friction forces acting on the main rotating flow and the continuity condition for the circulatory flow.
Только метаданные
Thermally driven countercurrent plasma centrifuge
(2021) Whichello, J. V.; Borisevich, V. D.; Potanin, E. P.; Борисевич, Валентин Дмитриевич
© 2020 Taylor & Francis.Renewed interest in plasma isotope separation stems from the need to produce certain isotopes more inexpensively. These include isotopes of groups I and II, rare earth and some other elements of the periodic table. While gas centrifuge cascades, developed for uranium enrichment, are capable of a wider range of separation applications, they are limited to elements that can form volatile gaseous compounds at room temperature. In the absence of a suitable compound, more expensive separation techniques are used, consuming considerable electrical power for relatively low throughputs. We believe that a new type of plasma centrifuge can be a viable alternative.
Только метаданные
Classification of model cascades for separation of multicomponent isotope mixtures
(2021) Zeng, S.; Jiang, D.; Sulaberidze, G. A.; Smirnov, A. Y.; Borisevich, V. D.; Сулаберидзе, Георгий Анатольевич; Смирнов, Андрей Юрьевич; Борисевич, Валентин Дмитриевич
© 2020, © 2020 Taylor & Francis.As far as we know, it is the first attempt to build the classification of the currently existing models of molecular-selective mass transfer in cascades for isotope separation in the stationary mode of their operation. In papers devoted to this subject, such cascades are often called as “model” ones. It is shown that for the case of symmetric separation any of such a “model” cascade can be represented as a special case of a cascade with constant separation factors. There are established interrelationships of the “model” cascades, both with each other and with the symmetrical countercurrent cascades feasible in practice.
Только метаданные
Application of the Dorodnitsyn Transformation for Analysis of Heat and Mass Transfer in Rotating Flows
(2021) Borisevich, V. D.; Potanin, E. P.; Борисевич, Валентин Дмитриевич
A method based on the use of the Dorodnitsyn transformation is proposed for calculating the nonisothermal laminar boundary layers on a disk rotating in a gaseous medium. An approximate account for the nonlinear inertial terms is performed by the Slezkin-Targ method. It is demonstrated that, upon cooling the surface of the disk-end rotating slower than the external flow, it is possible not only to weaken the radial flow of a viscous heat-conducting gas, but also to change the direction of the flow velocity in the boundary layer to the opposite one. The possibilities of using the results to reduce the masking effect of the end elements in the experimental study of the stability of rotational flows as well as to control the circulation flows in closed systems are discussed.
Только метаданные
Influence of Radial Change in Gas Density on Nonlinear Hydrodynamic Effects in Its Flow Over a Rotating Disk
(2022) Potanin, E. P.; Borisevich, V. D.; Борисевич, Валентин Дмитриевич
© 2022, Springer Science+Business Media, LLC, part of Springer Nature.A laminar boundary layer in a gas flow near a disk rotating at a constant angular velocity under the conditions of a significant radial redistribution of the gas density is investigated. The analysis is performed on the basis of a self-similar transformation for the gas density varying according to a power law in the radial direction. Calculation of the boundary layer characteristics in the gas flow was made by the Slezkin–Targ method. The dependence of the resistance forces acting on the disk on the gas compressibility is investigated. It is shown that an increase in the radial gradient of the gas density leads to a noticeable increase in azimuthal friction forces in the boundary layer near the disk. The results obtained for an extended disk are used to estimate the intensity of the circulation flow in a rotating cylinder of finite dimensions at a small ratio of the height of the cylinder to its radius. As follows from the calculation results, an increase in the gas compressibility parameter leads to an increase in its circulation rate.
Только метаданные
Solution of the simplified fluid dynamic equation for transient processes in a gas centrifuge
(2022) Zeng, S.; Borisevich, V. D.; Smirnov, A. Yu.; Sulaberidze, G. A.; Борисевич, Валентин Дмитриевич; Смирнов, Андрей Юрьевич; Сулаберидзе, Георгий Анатольевич
© 2022 Institute of Physics Publishing. All rights reserved.The equation describing a transient process in a gas centrifuge is a partial differential equation and has to be solved by using a numerical method. The Crank-Nicolson scheme and a central difference scheme are employed, respectively, for time discretization and space discretization. Under the condition of full circulation flow, the solution of the equation coincides with the result of the linear theory, verifying the correctness of numerical solution. The transient processes of a centrifuge are simulated with two withdrawal models to reveal the variations of the axial velocity with time in the processes. The results shows that for a given rotor peripheral speed, the radial distribution of the axial velocity depends mainly on the wall pressure and the withdrawal strength, but the influence of the withdrawals is much weaker than the wall pressure. The results also demonstrate that the partial differential equations describing the fluid dynamics in a transient process does exhibit the dynamic variations, and can be further applied to the analysis of separation performance.