Buoyancy effects in vertical rectangular duct with coplanar magnetic field and single sided heat load

Kirillov, I.R.; Obukhov, D.M.; Genin, L. G.; Sviridov, V. G.; Razuvanov, N. G.; Батенин, В. М.; Belyaev, I. A.; Poddubnyi, I.; Pyatnitskaya, N. Yu.

doi:10.1016/j.fusengdes.2016.01.010

Cited by 34 publications

(12 citation statements)

References 14 publications

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“…Qualitatively similar oscillations are observed in the experiments [6]. The experimental flow cannot be reproduced in the framework of our model because at the parameters of the experiment (Gr ≈ 10 8 , Re ≈ 10 4 , Ha ≤ 800) the conditions of the two-dimensional approximation (1) are not satisfied to a sufficient degree of certainty.…”

Section: Discussionsupporting

confidence: 51%

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Convection instability in a downward flow in a vertical duct with strong transverse magnetic field

Zhang

Zikanov

2018

Physics of Fluids

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The downward flow in a vertical duct with one heated and three thermally insulated walls is analyzed numerically using the two-dimensional approximation valid in the asymptotic limit of an imposed strong transverse magnetic field. The work is motivated by the design of liquid metal blankets with poloidal ducts for future nuclear fusion reactors, in which the main component of the magnetic field is perpendicular to the flow direction and very strong heating is applied at the wall facing the reaction chamber. The flow is found to be steady-state or oscillating depending on the strengths of the heating and magnetic field. A parametric study of the instability leading to the oscillations is performed. It is found among other results that the flow is unstable and develops high-amplitude temperature oscillations at the conditions typical for a fusion reactor blanket. * zikanov@umich.edu 1 arXiv:1804.02659v1 [physics.flu-dyn]

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Section: Discussionsupporting

confidence: 51%

“…The convection in a downward flow in a vertical round pipe and duct has been investigated experimentally [6,10,12,13] and numerically [11,31]. It has been found that the thermal convection is a critical factor determining the flow structure.…”

Section: Introductionmentioning

confidence: 99%

Convection instability in a downward flow in a vertical duct with strong transverse magnetic field

Zhang

Zikanov

2018

Physics of Fluids

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“…The first indications that turbulence suppression does not necessarily lead to a steady laminar convection were obtained in the experiments, such as [14,24,18]. Mixed convection in flows of mercury in pipes and ducts of various orientations with respect to gravity and imposed magnetic field were studied at Gr ≤ 10 8 , Ha ≤ 800 Re ≤ 5 × 10 4 .…”

Section: Extreme Magnetoconvectionmentioning

confidence: 99%

Instabilities in Extreme Magnetoconvection

Zikanov

Listratov

Zhang

et al. 2018

Computational Methods in Applied Sciences

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Thermal convection in an electrically conducting fluid (for example, a liquid metal) in the presence of a static magnetic field is considered in this chapter. The focus is on the extreme states of the flow, in which both buoyancy and Lorentz forces are very strong. It is argued that the instabilities occurring in such flows are often of unique and counter-intuitive nature due to the action of the magnetic field, which suppresses conventional turbulence and gives preference to two-dimensional instability modes not appearing in more conventional convection systems. Tools of numerical analysis suitable for such flows are discussed.

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“…Данная зона является концентратором напряжений, значения в которой сильно зависят о технологии изготовления и наличия/отсутствия галтели. Оценка, выполненная по размаху деформаций в центральной части канала (0,19%), показывает, что допустимое число циклов составляет ~10 5 . Режим работы реактора ИТЭР предполагает работу в течение 3•10 4 циклов, т.е.…”

Section: критериальный анализ параметров температурных пульсацийunclassified

“…Теплообмен в этих условиях происходит под воздействием поперечного магнитного поля [3] и сил плавучести [4]. Экспериментальные результаты, полученные на моделях, приведены в [5][6][7]. Эти данные показывают, что для нисходящего потока в определённом диапазоне характерных параметров развиваются высокоамплитудные колебания температуры, которые связаны с вторичными крупномасштабными вихрями в потоке, вызванными совместным влиянием сил плавучести и электромагнитных сил.…”

Section: Introductionunclassified

Evaluation of Temperature Fluctuations Influence on the Structure of Tokamak-Reactor Liquid Metal Blanket Module

Belyaev¹,

Poddubnyi²,

Razuvanov³

et al. 2018

PAST-TF

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В статье приводятся примеры экспериментально полученных температурных пульсаций на стенке модельного жидкометаллического теплообменника, помещённого в условия, приближенные к реализуемым в бланкете реактора-токамака. Предлагается методика для оценки параметров подобных пульсаций в реальных условиях работы различных проектов теплообменных систем реактора-токамака. Для приближенных к реальным условиям моделей теплообменных систем приводится расчёт циклических термических напряжений, вызванных пульсациями температуры на стенке, цель которого оценить в первом приближении потенциальную опасность аномальных пульсаций температуры, наблюдаемых экспериментально на моделях. Ключевые слова: магнитная гидродинамика, теплообмен, пульсации температуры, испытательный модуль бланкета, напряжённо-деформированное состояние, циклическая прочность.

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Buoyancy effects in vertical rectangular duct with coplanar magnetic field and single sided heat load

Cited by 34 publications

References 14 publications

Convection instability in a downward flow in a vertical duct with strong transverse magnetic field

Convection instability in a downward flow in a vertical duct with strong transverse magnetic field

Instabilities in Extreme Magnetoconvection

Evaluation of Temperature Fluctuations Influence on the Structure of Tokamak-Reactor Liquid Metal Blanket Module

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