2021, Borman, V. D., Belogorlov, A. A., Tronin, I. V., Белогорлов, Антон Анатольевич, Тронин, Иван Владимирович

© 2021, Pleiades Publishing, Inc.A new mechanism has been proposed for the cooperative transport of a nonwetting liquid in a nanoporous medium. The description of transport is based on the theory of critical dynamics of multiscale phenomena in atomic systems. Transport is described as a time-multiscale process of interaction of a fluctuating filling–escape mode, macroscopic spontaneous filling mode, and filling mode caused by the critical pressure of compression of a dynamic percolation transition. The model is based on the solution of the system of kinetic equations for the distribution function of accessible and filled pores, which allows calculating macroscopic quantities describing processes at various time scales. A case where macroscopic transport modes are developed simultaneously in two different time scales is considered. A “nanoscopic” model of filling of nanopores under the development of the spontaneous mode taking into account the conservation of the volume of the suspension at the equality of rates of development of the modes at different time scales has been proposed. The predicted time dependences of the flux and volume of filled pores correspond to dissipationless transport in the system of nanopores. Theoretical dependences describe known and new experimental data. Unusual dynamic properties correspond to the properties of systems with positive feedback.

2020, Khabarova, K. Yu., Kolachevsky, N. N., Derevyashkin, S. P., Borisyuk, P. V., Strelkin, S. A., Tkalya, E. V., Tregubov, D. O., Tronin, I. V., Yakovlev, V. P., Борисюк, Петр Викторович, Ткаля, Евгений Викторович, Трегубов, Дмитрий Олегович, Тронин, Иван Владимирович, Яковлев, Валерий Петрович

© 2020 Astro Ltd Printed in the UKWe describe a method that allows accumulation in a Paul trap of a large number of ions obtained from multiple laser ablation pulses, and therefore solving the problem of a single pulse that usualy gives rise to final trapping of too few ions. The proposed method of the cumulative trap loading was based on interaction with a buffer gas that provided a friction force. The method was applied to triply charged thorium ions and trapped a total of 106 ions. Numerical analysis of the ion motion allowed the experimental parameters to be optimized for the most effective implementation of the technique.

2025, Dzhulya, D. N., Bogovalov, S. V., Tronin, I. V., Джуля, Денис Николаевич, Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

2026, ДЖУЛЯ, Д. Н., БОГОВАЛОВ, С. В., ТРОНИН, И. В., Боговалов, Сергей Владимирович, Тронин, Иван Владимирович, Джуля, Денис Николаевич

Разделение волнами в газовых центрифугах (ГЦ) происходит за счёт двух основных механизмов - бародиффузии и радиальных колебаний газа в волне [1]. Сделана аналитическая оценка разделения изотопной смеси UF6 в ГЦ за счёт обоих механизмов в безотборном режиме ГЦ для различных скоростей вращения ГЦ и частоты волны.

2024, Dzhulya, D. N., Bogovalov, S. V., Tronin, I. V., Джуля, Денис Николаевич, Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

2014, Borisevich, V. D., Borman, V. D., Bogovalov, S. V., Kislov, V. A., Tronin, V. N., Tronin, I. V., Abramov, V. I., Yupatov, S. V., Кислов, Владимир Александрович, Боговалов, Сергей Владимирович, Борисевич, Валентин Дмитриевич, Тронин, Иван Владимирович

We discuss the possibility of applying the semi-empirical formula derived for evaluating the separative power of the Russian-type optimized gas centrifuge, with a rotor length about 1 m, to centrifugal machines of arbitrary length. It is demonstrated that the formula can adequately describe the dependence of a single gas centrifuge's performance on rotor peripheral rotation, length, and diameter for machines with lengths of up to 5 m. The comparison of the calculated values for separative power, obtained by numerical simulations of flow and diffusion in gas centrifuges with that of the URENCO machines, demonstrates satisfactory agreement. © 2014 Copyright Taylor and Francis Group, LLC. Acknowledgement: This work is supported by the Ministry of Education and Science of Russian Federation in the framework of the Federal Targeted Program Scientific and Pedagogical Staff for Innovative Russia for 2009-2013, State Contract No. 16.740.11.0536 (the project leader is Professor V. D. Borisevich).

2024, Bogovalov, S.V., Dzhulya, D.N., Tronin, I.V., Боговалов, Сергей Владимирович, Джуля, Денис Николаевич, Тронин, Иван Владимирович

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.

2020, Bogovalov, S. V., Borman, V. D., Tronin, I. V., Tronin, V. N., Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

The 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.

2019, Bogovalov, S. V., Romanikhin, S. M., Tronin, I. V., Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

© 2019, Pleiades Publishing, Inc. The mechanism for the formation of disk-like flows from rapidly rotating Be stars is not yet clear. An axisymmetric hydrodynamic stellar wind flow from a rapidly rotating star has been simulated numerically as a step in solving this problem. The change in the shape of the star as it rotates and the turbulence excited in the stellar wind at Reynolds numbers ∼10 9 −10 13 are taken into account. Calculations show the formation of a disk-like flow from the stellar surface at the equator, which expands into the polar regions due to a pressure gradient on scales of the order of the stellar radius. A poloidal velocity vortex is formed at high latitudes. No turbulence is excited near the equator within the simplest standard models and, therefore, no quasi-Keplerian disk-like flow emerges in the equatorial plane. A dependence of the total mass flux on the stellar rotation rate at various surface temperatures has been obtained.