Персона: Лаврухин, Алексей Анатольевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Алексей Анатольевич
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- ПубликацияОткрытый доступFeatures of training specialists for responsibility centers of the project direction "proryv"(2020) Kutsenko, K. V.; Lavrukhin, A. A.; Pershukov, V. A.; Ternovykh, M. Yu.; Tikhomirov, G. V.; Куценко, Кирилл Владленович; Лаврухин, Алексей Анатольевич; Першуков, Вячеслав Александрович; Терновых, Михаил Юрьевич; Тихомиров, Георгий Валентинович© Published under licence by IOP Publishing Ltd.National Research Nuclear University "MEPhI"(NRNU MEPhI) is the leading university of the consortium of reference universities of the State Atomic Energy Corporation Rosatom (ROSATOM), a regular supplier of young specialists of the highest level. Since 2014 NRNU MEPhI has been training graduates for responsibility centers of the project direction "Proryv". University responds quickly to staffing challenges, and provides the project "Proryv"the personnel with relevant unique competencies. These competencies include the ability to apply the knowledge gained to develop a new technological platform for nuclear power with the involvement of uranium-238 and spent nuclear fuel reprocessing products in the fuel cycle. Obtaining such unique knowledge is impossible without the use of external resources, namely, the involvement of leading scientists and practitioners of ROSATOM for conducting classes with students, organizing practices in scientific centers and at nuclear fuel cycle enterprises. The article discusses the features of the organization of the educational process in this area.
- ПубликацияТолько метаданныеTransient boiling crisis in liquid nitrogen. influence of heater size and heating rate(2020) Delov, M. I.; Kuzmenkov, D. M.; Lavrukhin, A. A.; Kutsenko, K. V.; Делов, Максим Игоревич; Кузьменков, Дмитрий Михайлович; Лаврухин, Алексей Анатольевич; Куценко, Кирилл Владленович© 2020It is known that the nucleate boiling of different refrigerants (liquid nitrogen, freons etc.) may drop to the film boiling regime at a heat flux, which is significantly lower than the value from the standard boiling curve. This happens during unsteady heating at a minimum critical heat flux, whose value depends on different parameters of the process: heater geometry, pressure, subcooling relative to saturation, fluid type, initial conditions etc. In this article, we present new experimental results on the influence of the size of the heater and the heating rate on the minimum critical heat flux. The experiments are accompanied by numerical simulations and a theoretical analysis, where we demonstrate how the minimum critical heat flux is computed for a given case. In addition, we demonstrate that the minimum critical heat flux does not depend on the size of the heater at atmospheric pressure when the size of the heater is larger than 1 mm. This parameter is also independent of the temporal history of heat supply. The derived theoretical approach finds applications in the design of the systems based on high-temperature superconductors.
- ПубликацияТолько метаданныеDiagnostics of transient heat transfer regimes based on statistical and frequency analysis of temperature fluctuations(2020) Delov, M. I.; Litvintsova, Y. E.; Kuzmenkov, D. M.; Laouar, S.; Maslov, Y. A.; Lavrukhin, A. A.; Balakin, B. V.; Kutsenko, K. V.; Делов, Максим Игоревич; Кузьменков, Дмитрий Михайлович; Маслов, Юрий Александрович; Лаврухин, Алексей Анатольевич; Куценко, Кирилл Владленович© 2019, © 2019 Taylor & Francis.The paper presents the results of experimental and theoretical studies of temperature fluctuations at the surface of heaters in different heat transfer regimes. Developing several methods of treatment for the temperature fluctuations, we succeed in the diagnosing the onset of transient boiling regimes. The proposed methods are based on the statistical analysis of histograms and amplitude-frequency analysis of the spectra of temperature fluctuations. In addition, the study demonstrates and compares how these techniques may be utilized to predict the transitions from the convective heat transfer to the nucleate boiling and the film boiling regimes.
- ПубликацияТолько метаданныеDiagnostics of coolant boiling onset based on the analysis of fluctuations of thermohydraulic parameters(2020) Litvintsova, Y. E.; Laouar, S.; Delov, M. I.; Kuzmenkov, D. M.; Lavrukhin, A. A.; Kutsenko, K. V.; Делов, Максим Игоревич; Кузьменков, Дмитрий Михайлович; Лаврухин, Алексей Анатольевич; Куценко, Кирилл Владленович© Published under licence by IOP Publishing Ltd.When operating heat-exchange facilities, it is of interest to develop methods of diagnostic and prediction for coolant boiling onset. It is known that the surface temperature of a heating element always has stochastic oscillations around an average value, the analysis of such fluctuations will make it possible to predict the change in the heat transfer regimes. This paper presents the results of an experimental study of temperature fluctuations for an inertial heater and using of method of diagnostic are based on statistical and frequency analysis of temperature fluctuations. It is shown that there is a correlation between the frequency characteristics of heater temperature fluctuations and oscillations in the thermohydraulic parameters of the coolant (temperature, flow, pressure). The obtained results will find application in the development of an automated system for diagnostics the coolant boiling onset in power facilities.