Персона: Боговалов, Сергей Владимирович
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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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- ПубликацияТолько метаданныеOptimal working regimes of the hyper-speed long Iguasu gas centrifuge(2020) Bogovalov, S. V.; Borman, V. D.; Vasilyev, A. V.; Tronin, I. V.; Tronin, V. N.; Боговалов, Сергей Владимирович; Васильев, Александр Владиславович; Тронин, Иван Владимирович© 2020 Published under licence by IOP Publishing Ltd.Rapid development of technologies for production of new materials may provide design of gas centrifuges (hereafter GC) with rotor speed above 1000 m/s. The question about efficiency of such GCs remains open. At present no experimental or theoretical studies regarding the separation effciency of such GCs exist. We present the results of calculations of the optimized separative power of the hyper-speed Iguassu GCs with a length of 1 to 5 meters and rotational speeds from 1000 to 1500 m/s. The calculations were performed in axisymmetric approximation in frameworks of the source-sink model. It is shown that for the hyper-speed GCs the optimized separative power, pressure at the rotor wall, feed flux and gas friction power linearly grow with the rotor length, while the temperature drop along the rotor does not depend on the rotor length.
- ПубликацияТолько метаданныеOptimized Separative Power of Hyperspeed Iguassu Gas Centrifuge: Dependence on the Rotor Diameter and Velocity(2020) Bogovalov, S. V.; Borman, V. D.; Tronin, I. V.; Tronin, V. N.; Боговалов, Сергей Владимирович; Тронин, Иван ВладимировичThe dependence of the separative power of Iguassu gas centrifuges (GCs) on the rotor diameter and velocity of rotation V above 1000 m/s is investigated. The separative power is calculated exploring numerical modeling of the gas dynamics and diffusion of the binary mixture in a strong centrifugal field. The separative power is optimized on five internal parameters of the GC: pressure at the wall of the rotor, feed flux, temperature drop along the rotor wall, friction power of the waste scoop and radius of the baffle of the product chamber. Enrichment of the product flux does not depend on the velocity and diameter in the optimal regime of exploration. Growth of the separative power withis determined by growth of the feed flux with the velocity.
- ПубликацияТолько метаданныеWinds from fast rotating stars(2021) Bogovalov, S. V.; Petrov, M. A.; Timofeev, V. A.; Боговалов, Сергей Владимирович; Петров, Максим АлександровичNumerical modelling of an isothermal wind from a fast rotating star is performed. Excitation of hydrodynamical turbulence and deviation of the shape of the stellar surface from a sphere are taken into account. Rotation and turbulence result in a dramatic increase of the mass flow rate from the star in comparison with a non-rotating one. The outflow occurs predominantly from a region on the stellar surface located at the equator. This flow expands rapidly due to thermal pressure. However, a disc-like flow at the equator is formed. The flow is more complicated near the pole. At large distances from the star a radially expanding wind is formed while close to the star some fraction of the outflow from the equatorial region falls down on to the stellar surface, producing a huge vortex. The dependence of the mass loss rate on the parameters of the star is presented.
- ПубликацияТолько метаданныеImpact of the vacuum core on the upper limit of the separative power of gas centrifuges(2021) Tronin, I. V.; Bogovalov, S. V.; Borman, V. D.; Tronin, V. N.; Тронин, Иван Владимирович; Боговалов, Сергей Владимирович© 2020 Elsevier LtdAccording to Dirac's equation the upper limit of the separative power of a gas centrifuge grows with rotation velocity V of the rotor as V4. This equation has two significant drawbacks. First, it was obtained assuming zero axial fluxes. Secondly, it does not take into account formation of a vacuum core near the axis of rotation. Its volume grows with the speed of rotation. Separation of isotopes does not occur in the vacuum core. In our work, we propose a new formulation of the problem of finding the upper limit of separative power without assumptions about zero axial flows and taking into account the limitation of the volume involved in the separation processes. According to our results, the upper limit of separative power increases with increasing speed much slower than the Dirac estimate, in proportion to V2.
- ПубликацияТолько метаданныеModeling of the wind/disk outflow from be stars(2021) Bogovalov, S.; Petrov, M.; Боговалов, Сергей Владимирович; Петров, Максим Александрович© 2021 by the authors. Licensee MDPI, Basel, Switzerland.The objective of this work is to reproduce the formation of the fast polar wind and viscous disk outflow from Be stars in a unified physical picture. Numerical modeling of the plasma outflow from fast rotating stars was performed taking into account the acceleration of the plasma due to scattering of the radiation of the star in lines of plasma ions and excitation of the hydrodynamic turbulence in the outflow. The fast polar wind naturally arises in this picture with an expected flow rate. For the first time, it is shown that a disk-like outflow with a relatively high level of turbulence is formed at the equator of fast rotating stars emitting radiation-driven wind. However, the level of turbulent viscosity is well below the level necessary for the formation of a Keplerian disk.
- ПубликацияТолько метаданныеPreface(2022) Bogovalov, S. V.; Боговалов, Сергей Владимирович
- ПубликацияТолько метаданныеModeling of the Wind/Disk Outflow from Be Stars II: Formation of the Keplerian Disk(2022) Bogovalov, S.; Petrov, M.; Боговалов, Сергей Владимирович; Петров, Максим АлександровичComputer modeling of the outflow from Be stars is performed. In our approach, processes of turbulence excitation and turbulent viscosity are added to the conventional model of the radiation driven winds. The objective of our study is to reproduce from the first principles the main features of the outflow from Be stars: a fast polar wind and a slow viscous Keplerian disk at the equator. At sub-critical velocity of rotation up to 0.999 of the critical velocity, our model reproduces the formation of the fast polar wind together with a slow highly turbulent outflow at the equatorial region. This outflow, however, does not reassemble a Keplerian disk. We link this to the absence of the angular moment transfer from the star to the disk. This process provides an increase of the angular momentum of the disk matter with radius. We consider a star with super critical rotation as the simplest way to supply the angular momentum to the disk. In this case, the star surface has a higher azimuthal speed than the matter at the inner edge of the disk. The angular momentum transfer becomes unavoidable. Already at rotation velocity 0.5% above the critical one, a quasi Keplerian disk at the equator is formed with size ∼10 stellar radius. At rotation 1% higher than the critical speed, the disk reaches ∼15 stellar radius. The main conclusion following from our work is that the conventional model of the radiation driven winds is able to reproduce the main features of the outflow from Be stars provided that the process of turbulence excitation and a process of angular momentum supply of the disk from the central source are added in to this model. © 2022 by the authors.
- ПубликацияТолько метаданныеWave Isotope Separation in Super-Intense Centrifugal Fields(2024) Dzhulya, D. N.; Bogovalov, S. V.; Tronin, I. V.; Джуля, Денис Николаевич; Боговалов, Сергей Владимирович; Тронин, Иван Владимирович
- ПубликацияТолько метаданныеThree-dimensional modeling of the flow around the gas scoop under optimal working regime of the Iguassu gas centrifuge at the hyper fast rotation(2022) Bogovalov, S. V.; Borman, V. D.; Vasilyev, A. V.; Tronin, I. V.; Tronin, V. N.; Боговалов, Сергей Владимирович; Васильев, Александр Владиславович; Тронин, Иван Владимирович© 2022 Institute of Physics Publishing. All rights reserved.The problem of the gas withdrawal from an Iguassu gas centrifuge (GC) at the speed of rotation, over 1000 m/s is considered. We focus our attention on the problem of achieving of optimal waste flow and friction power of the gas scoop simultaneously. Calculations were carried out in a three-dimensional approximation for supersonic flow of UF6 around a stationary gas scoop taken as a Pitot tube with a diameter of 2 mm. Attempts to achieve the optimal working regime of GC for the selected particular gas scoop were not successful. On the basis of this results we conclude that the optimal gas withdrawal and creation of the optimal axial circulation can be problematic for the hyper-speed gas centrifuges.
- ПубликацияТолько метаданныеBarodiffusion Mechanism of Separation of an Isotopic Gas Mixture in Superstrong Centrifugal Fields Under the Impact of an Acoustic Wave(2024) Bogovalov, S.V.; Dzhulya, D.N.; Tronin, I.V.; Боговалов, Сергей Владимирович; Джуля, Денис Николаевич; Тронин, Иван Владимирович