Thermal convection of liquid sodium in inclined cylinders

Khalilov, R.; Kolesnichenko, I.; Pavlinov, A.; Mamykin, A. D.; Шестаков, А. В.; Frick, Peter

doi:10.1103/physrevfluids.3.043503

Cited by 44 publications

(35 citation statements)

References 35 publications

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“…The LSC flow is thus characterized by a torsion in agreement with DNS at similar by Scheel & Schumacher (2016, 2017) and experiments in liquid sodium at (Khalilov et al. 2018). We come back to this point in § 3.2.…”

Section: Large-scale Flow Dynamicssupporting

confidence: 85%

“…(2005) and more recently by Khalilov et al. (2018), or Vogt et al. (2018 a ), who found a jump-rope-type large-scale flow.…”

Section: Introductionmentioning

confidence: 84%

“…Furthermore, the angles oscillate in anti-phase, which is a clear indication of the torsion mode (Funfschilling & Ahlers 2004; Xie, Wei & Xia 2013; Khalilov et al. 2018). The LSC flow is thus characterized by a torsion in agreement with DNS at similar by Scheel & Schumacher (2016, 2017) and experiments in liquid sodium at (Khalilov et al.…”

Section: Large-scale Flow Dynamicsmentioning

confidence: 99%

“…(2013) in fluorinert FC-77 electronic liquid at or by Khalilov et al. (2018) in liquid sodium at ; (ii) correlation of the hot and cold temperature signatures at half-height, resulting in the characteristic sloshing phase shift of ; see data by Qiu & Tong (2001) and Xi et al. (2009) in water at ; and (iii) correlation of the mean LSC orientation at half-height and the top or bottom flow orientation yielding a phase shift of ; see measurements by Zhou et al.…”

Section: Large-scale Flow Dynamicsmentioning

confidence: 99%

“…Only recently has the interest in this research topic increased with new experiments by Khalilov et al. (2018) and Vogt et al. (2018 a ).…”

Section: Introductionmentioning

confidence: 99%

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Combined measurement of velocity and temperature in liquid metal convection

et al. 2019

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Combined measurements of velocity components and temperature in a turbulent Rayleigh-Bénard convection flow at a low Prandtl number of Pr = 0.029 and Rayleigh numbers between 10 6 ≤ Ra ≤ 6×10 7 are conducted in a series of experiments with durations of more than a thousand free-fall time units. Multiple crossing ultrasound beam lines and an array of thermocouples at mid-height allow for a detailed analysis and characterization of the complex three-dimensional dynamics of the single large-scale circulation (LSC) roll in the cylindrical convection cell of unit aspect ratio which is filled with the liquid metal alloy GaInSn. We measure the internal temporal correlations of the complex large-scale flow and distinguish between short-term oscillations associated with a sloshing motion in the mid-plane with varying orientation angles of the velocity close to the top/bottom plates and the slow azimuthal drift of the mean orientation of the roll as a whole that proceeds on a hundred times slower time scale. The coherent LSC drives a vigorous turbulence in the whole cell that is quantified by direct Reynolds number measurements at different locations in the cell. The velocity increment statistics in the bulk of the cell displays characteristic properties of intermittent small-scale fluid turbulence. We also show that the impact of the symmetry-breaking large-scale flow persists to small-scale velocity fluctuations thus preventing the establishment of isotropic turbulence in the cell centre. Reynolds number amplitudes depend sensitively on beam line position in the cell such that different definitions have to be compared. The global momentum and heat transfer scalings with Rayleigh number are found to agree with those of direct numerical simulations and other laboratory experiments.arXiv:1907.03472v1 [physics.flu-dyn]

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