Test facility for investigation of heat transfer of promising coolants for the nuclear power industry

Belyaev, I. A.; Sviridov, V. G.; Батенин, В. М.; Biryukov, D. A.; Nikitina, I. S.; Manchkha, S. P.; Pyatnitskaya, N. Yu.; Razuvanov, N. G.; Sviridov, E. V.

doi:10.1134/s0040601517110027

Cited by 25 publications

(9 citation statements)

References 10 publications

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“…Similar evaluations have been done for the future experiments on the recently built experimental facility (see, e.g. Belyaev et al 2017), in which liquid mercury flows in the duct with the half-width of d = 2.8 cm. The physical properties of Hg are taken at 303 K (Zikanov et al 2021).…”

Section: Results Of Dns Of Nonlinear Flowsmentioning

confidence: 65%

“…The study follows the work of Zhang & Zikanov (2014) but differs by much larger values of Gr and Ha and the aspect ratio Γ = 3.5 selected to match the new experimental facility (see, e.g. Belyaev et al 2017), on which the same configuration is to be explored at Ha 10 3 and Gr 10 8 in the near future. Another essential difference between our work and the work by Zhang & Zikanov (2014) is that we carry out an in-depth analysis of the accuracy of the 2-D approximation applied to quasi-2-D flows at such high Ha.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoconvection in a horizontal duct flow at very high Hartmann and Grashof numbers

2021

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Direct numerical simulations and linear stability analysis are carried out to study mixed convection in a horizontal duct with constant-rate heating applied at the bottom and an imposed transverse horizontal magnetic field. A two-dimensional approximation corresponding to the asymptotic limit of a very strong magnetic field effect is validated and applied, together with full three-dimensional analysis, to investigate the flow's behaviour in the previously unexplored range of control parameters corresponding to typical conditions of a liquid metal blanket of a nuclear fusion reactor (Hartmann numbers up to $10^4$ and Grashof numbers up to $10^{10}$ ). It is found that the instability to quasi-two-dimensional rolls parallel to the magnetic field discovered at smaller Hartmann and Grashof numbers in earlier studies also occurs in this parameter range. Transport of the rolls by the mean flow leads to magnetoconvective temperature fluctuations of exceptionally high amplitudes. It is also demonstrated that quasi-two-dimensional structure of flows at very high Hartmann numbers does not guarantee accuracy of the classical two-dimensional approximation. The accuracy deteriorates at the highest Grashof numbers considered in the study.

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Section: Results Of Dns Of Nonlinear Flowsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Magnetoconvection in a horizontal duct flow at very high Hartmann and Grashof numbers

2021

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“…Experiments are performed using the HELME facility (HELMEF) described by Belyaev et al [2017]. Mercury circulating in a closed loop is used as a model liquid.…”

Section: Description Of Experimentsmentioning

confidence: 99%

Experimental study of submerged liquid metal jet in transverse magnetic field

Belyaev¹,

Mironov²,

Luchinkin³

et al. 2021

Preprint

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A liquid metal flow in the form of a submerged round jet entering a square duct in the presence of a transverse magnetic field is studied experimentally. A range of high Reynolds and Hartmann numbers is considered. Flow velocity is measured using electric potential difference probes. A detailed study of the flow in the duct's cross-section about seven jet's diameters downstream of the inlet reveals the dynamics, which is unsteady and dominated by high-amplitude fluctuations resulting from instability of the jet. The flow structure and fluctuation properties are largely determined by the value of the Stuart number N. At moderate N, the mean velocity profile retains a central jet with three-dimensional perturbations increasingly suppressed by the magnetic field as N grows. At higher values of N, the flow becomes quasi-two-dimensional and acquires the form of an asymmetric macrovortex, with high-amplitude velocity fluctuations reemerging.

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“…Gr 10 10 and 10 3 Ha 10 4 are performed. The study follows the work of Zhang & Zikanov (2014) but differs by much larger values of Gr and Ha and the aspect ratio Γ = 3.5 selected to match the new experimental facility (see, e.g., Belyaev et al 2017), on which the same configuration is to be explored at Ha 10 3 and Gr 10 8 in the near future. Another essential difference between our work and the work by Zhang & Zikanov (2014) is that we carry out an in-depth analysis of the accuracy of the twodimensional approximation applied to Q2D flows at such high Ha.…”

Section: Introductionmentioning

confidence: 99%

Magnetoconvection in a horizontal duct flow at very high Hartmann and Grashof numbers

Ruslan¹,

Zikanov²,

Listratov³

2021

Preprint

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Direct numerical simulations and linear stability analysis are carried out to study mixed convection in a horizontal duct with constant-rate heating applied at the bottom and imposed transverse horizontal magnetic field. A two-dimensional approximation corresponding to the asymptotic limit of very strong magnetic field effect is validated and applied, together with full three-dimensional analysis, to investigate the flow's behaviour in the previously unexplored range of control parameters corresponding to typical conditions of a liquid metal blanket of a nuclear fusion reactor. It is found that the instability to quasi-two-dimensional rolls parallel to the magnetic field discovered at smaller Hartmann and Grashof numbers in earlier studies also occurs in this parameter range. Transport of the rolls by the mean flow leads to magnetoconvective temperature fluctuations of exceptionally high amplitudes. It is also demonstrated that quasi-twodimensional structure of flows at very high Hartmann numbers does not guarantee accuracy of the classical two-dimensional approximation. The accuracy deteriorates at the highest Grashof numbers considered in the study.

show abstract

Test facility for investigation of heat transfer of promising coolants for the nuclear power industry

Cited by 25 publications

References 10 publications

Magnetoconvection in a horizontal duct flow at very high Hartmann and Grashof numbers

Magnetoconvection in a horizontal duct flow at very high Hartmann and Grashof numbers

Experimental study of submerged liquid metal jet in transverse magnetic field

Magnetoconvection in a horizontal duct flow at very high Hartmann and Grashof numbers

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