Персона: Кузьменков, Дмитрий Михайлович
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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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Дмитрий Михайлович
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- 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 метаданныеSolar steam generation enabled by iron oxide nanoparticles: Prototype experiments and theoretical model(2020) Thon, H.; Kosinski, P.; Struchalin, P. G.; Kuzmenkov, D. M.; Kutsenko, K. V.; Balakin, B. V.; Стручалин, Павел Геннадьевич; Кузьменков, Дмитрий Михайлович; Куценко, Кирилл Владленович© 2020Photo-thermal evaporation of nanofluids has potential applications in solar desalination, micro-CHP (combined heat and power) and domestic off-grid disinfection. In this research, we reproduced the process experimentally using 110-nm iron oxide particles dispersed in water. At an initial lab-scale stage, under the artificial radiation of 6.9 suns, we observed that the boiling nanofluid destabilizes to a suspension of 6µm agglomerates of nanoparticles and that up to 30% of the particles escape the system with the steam. At the prototype stage, we boiled the fluid in a solar concentrator producing 35 g/min steam with an efficiency of around 60%, which is sufficient to drive a small turbine. The optimum concentration of the nanoparticles was 3 wt%. To supplement the experiments, we developed a simplified model for engineering calculations of the solar steam generation rate. The model corresponds well to the experiments deviating by only 8%.
- 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.
- ПубликацияТолько метаданныеA thermohydraulic flow loop for developing novel solutions in the field of using digital twins for nuclear power facilities(2020) Laouar, S.; Delov, M. I.; Litvintsova, Yu. E.; Kuzmenkov, D. M.; Muradyan, K. Yu.; Navasardyan, M. V.; Kutsenko, K. V.; Делов, Максим Игоревич; Кузьменков, Дмитрий Михайлович; Мурадян, Карен Юрикович; Куценко, Кирилл Владленович© 2020 Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University 'MEPhI'. All rights reserved.The experience is presented in building a thermohydraulic flow loop for developing technical and software solutions in using digital twins of nuclear equipment. The thermohydraulic flow loop was developed and manufactured at National Research Nuclear University MEPhI and represents a two-loop facility that allows investigating the processes of heat and mass exchange at forced and natural water circulation modes. The experimental facility allows one to obtain new data on heat transfer and hydrodynamics of two-phase flows round the fuel element bundles required for verification of computer codes. The obtained preliminary experimental results agree well with the calculations based on various codes. As part of building a digital twin for the thermohydraulic flow loop, a system is developed to diagnose, control and monitor heat-exchange transients based on physically justified real-time techniques. Neural network technologies will make it possible to predict changes in the flow loop's thermohydraulic parameters in response to external impacts. Further, a virtual prototype of the experimental facility is expected to be used in the training process and for distance learning.
- ПубликацияТолько метаданныеSolar steam generation in fine dispersions of graphite particles(2020) Alyaev, S.; He, Y.; Kuzmenkov, D. M.; Delov, M. I.; Zeynalyan, K.; Struchalin, P. G.; Kutsenko, K. V.; B. V. Balakin.; Кузьменков, Дмитрий Михайлович; Делов, Максим Игоревич; Стручалин, Павел Геннадьевич; Куценко, Кирилл Владленович© 2020 Elsevier LtdThe direct photothermal boiling in suspensions of nano- and microscopic particles finds multiple applications in concentrated solar power: turbine-based combined heat and power (CHP) generation, solar distillation, energy storage, and chemical synthesis. However, the most promising application is solar desalination. There have been multiple studies aimed at the evaporation of suspensions using simulated solar light, but there is neither a theory describing the process nor a well-documented prototype study. This article aims at the development of an experiment and a theory, that describe the photothermal boiling in aqueous suspensions of graphite. We develop a laboratory scale steam-fluid loop with continuous condensation that recycles the water back to the process. We clarify how the concentration and incident radiant heat influence the steam generation. The optimum concentration of graphite particles - 1 wt% - was found experimentally at 17.4 suns. We studied the granulometry of the suspension and dynamics of steam bubbles. We document how the particle size distribution and bubbles evolve in boiling suspension. The theoretical description of the process is based on a heat balance analysis for an individual steam bubble. The developed model is validated against three independent experimental datasets, exhibiting accuracy with the lowest average discrepancy of 10%.
- ПубликацияТолько метаданныеNumerical studies of boiling in nanofluids exposed to thermal radiation(2019) Karelova, D. G.; Kuzmenkov, D. M.; Kutsenko, K. V.; Delov, M. I.; Balakin, B. V.; Кузьменков, Дмитрий Михайлович; Куценко, Кирилл Владленович; Делов, Максим Игоревич© 2019 Author(s).Photothermal boiling in nanofluids is an energy-efficient process finding multiple promising applications in medicine, space technology, laser printing and nuclear engineering. The most important field is though solar energy where the nanoparticle-driven boiling of the base fluid drives a nano-turbine or a distillator. Hundreds of experimental and theoretical studies has been conducted in this direction over the past decade. There is however no reliable theory that describes kinetics of the process. The present contribution presents a numerical model of the process of photo-thermal evaporation in aqueous nanofluids. The model was used to predict the evaporation rate depending on concentration of the nanoparticles. The simulation results were compared with the experimental data over a range of concentrations (up to 10% wt.), demonstrating suitable agreement with the experiment.
- ПубликацияТолько метаданныеКипение мелкодисперсных суспензий под действием солнечного излучения(2021) Кузьменков, Д. М.; Кузьменков, Дмитрий Михайлович; Куценко Кирилл ВладленовичКраткая характеристика В последнее время широкое распространение получила идея применения мелкодисперсных суспензий с характерным размером твердой фракции от 10 до 500 нм (т. н. наножидкости) в солнечных коллекторах для объединения функций поглотителя солнечной энергии и кипящего теплоносителя. В научной литературе показана принципиальная возможность создания таких солнечных коллекторов, однако большинство выполненных исследований не учитывают особенности протекания процесса кипения в сложной многофазной системе жидкость-пар-частицы. Для достижения максимальной эффективности солнечного коллектора с использованием наножидкости для генерации пара под действием солнечного излучения необходимо определить оптимальный состав наножидкости и размер частиц. Влияние большого количества факторов на протекание процесса кипения в наножидкости приводит к тому, что для детального исследования процесса необходимы как большое количество тщательных экспериментальных исследований, так и модели, описывать ряд взаимосвязанных физических процессов. Изучение общих закономерной кипения суспензий под действием солнечного излучения и разработка соответствующих моделей позволит оценить целесообразность разработки солнечного коллектора на основе мелкодисперсных суспензий и найдут применение в смежных областях, таких как солнечное опреснение, лазерная литография и пр. кроме того, полученные результаты могут быть полезны в фундаментальной физике кипения. Цель диссертационной работы Целью диссертационного исследования является разработка модели кипения мелкодисперсной суспензии под действием теплового излучения посредствам объединения моделей образования пара в суспензии, поглощения теплового излучения в суспензии и гидродинамики и теплообмена в многофазной системе жидкость-частица-пар.
- ПубликацияТолько метаданныеHybrid Nanofluid in a Direct Absorption Solar Collector: Magnetite vs. Carbon Nanotubes Compete for Thermal Performance(2022) Struchalin, P. G.; Wang, X.; He, Y.; Kuzmenkov, D. M.; Yunin, V. S.; Balakin, B. V.; Кузьменков, Дмитрий Михайлович© 2022 by the authors. Licensee MDPI, Basel, Switzerland.The paper presents the experimental measurements of thermal efficiency of a tubular direct absorption solar collector (DASC) with a hybrid nanofluid based on magnetite (Fe3 O4) and multi-walled carbon nanotubes (MWCNT). The volumetric concentration of Fe3 O4 and MWCNT was 0.0053% and 0.0045%, respectively. The experiments were carried out for the flow rates of 2–10 L/min and a temperature difference up to 20◦ C between the environment and the DASC. The performance of the DASC with a hybrid nanofluid was in the range of 52.3–69.4%, which was just beyond the performance of the collector with surface absorption. It was also found that using a MWCNT-based nanofluid with an equivalent total volumetric concentration of particles (0.0091%), the efficiency was 8.3–31.5% higher than for the cases with the hybrid nanofluid.
- ПубликацияТолько метаданныеInfluence of Particle Size Distribution on the Optical Properties of Fine-Dispersed Suspensions(2022) Kuzmenkov, D.; Struchalin, P.; Litvintsova, Y.; Delov, M.; Skrytnyy, V.; Kutsenko, K.; Кузьменков, Дмитрий Михайлович; Стручалин, Павел Геннадьевич; Делов, Максим Игоревич; Скрытный, Владимир Ильич; Куценко, Кирилл ВладленовичNanofluids have great potential for solar energy harvesting due to their suitable optical and thermophysical properties. One of the promising applications of nanofluids is utilization in solar collectors with the direct absorption of light (DASC). The design of a DASC requires detailed knowledge of the optical properties of nanofluids, which can be significantly affected by the particle size distribution. The paper presents the method to take into account the particle size distribution when calculating nanofluid extinction spectra. To validate the proposed model, the particle size distribution and spectral absorbance were measured for aqueous suspension with multi-walled graphite nanotubes; the minimum size of primary nanoparticles was 49 nm. The proposed model is compared with experiments demonstrating the concentration averaged and maximum discrepancies of 6.6% and 32.2% against 12.6% and 77.7% for a model assuming a monosized suspension.