Transition between quasi-two-dimensional and three-dimensional Rayleigh-Bénard convection in a horizontal magnetic field

Vogt, Tobias; Ishimi, Wataru; Yanagisawa, Takatoshi; Tasaka, Yuji; Sakuraba, Ataru; Eckert, Sven

doi:10.1103/physrevfluids.3.013503

Cited by 31 publications

(83 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2016; Vogt et al. 2018 a , b ). The UDV system employed in this study is the DOP3010 (Signal Processing SA, Lausanne), equipped with MHz piezo-electric transducers.…”

Section: Laboratory–numerical Systemmentioning

confidence: 99%

Oscillatory thermal–inertial flows in liquid metal rotating convection

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…2016; Vogt et al. 2018 a , b ). The UDV system employed in this study is the DOP3010 (Signal Processing SA, Lausanne), equipped with MHz piezo-electric transducers.…”

Section: Laboratory–numerical Systemmentioning

confidence: 99%

Oscillatory thermal–inertial flows in liquid metal rotating convection

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our normalΓ=2 liquid gallium laboratory experiments are performed on the RoMag device (see Materials and Methods ) and span a Rayleigh number range of 7.1×104≤Ra≤5.1×106. Ultrasonic Doppler velocimetry (29) is used to measure the instantaneous flow distribution along four different measuring lines (Fig. 2).…”

Section: Laboratory-numerical Convection Experimentsmentioning

confidence: 99%

Jump rope vortex in liquid metal convection

Vogt

Horn

Grannan

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

136

View full text Add to dashboard Cite

SignificanceThe large-scale circulation (LSC) is the key dynamical feature of turbulent thermal convection. It is the underlying structure that shapes the appearance of geo- and astrophysical systems, such as the solar granulation or cloud streets, and the cornerstone of theoretical models. Our laboratory-numerical experiments reveal that the LSC can perform a fully 3D motion resembling a twirling jump rope. The discovery of this LSC mode implies that the currently accepted paradigm of a quasi-planar oscillating LSC needs to be augmented. Moreover, it provides an important link between studies in confined geometries used in experiments and simulations and the effectively unconfined fluid layers in natural settings where an agglomeration of LSCs forms larger patterns.

show abstract

“…The oscillations can be superimposed by a slow azimuthal drift of the mean flow orientation of the LSC roll as a whole. The UDV technique has been proved to detect complex flow structures in liquid metal thermal convection [11,12,14,24]. This method has been extended recently to linear transducer arrays that allow to reconstruct 2D flow patterns at high spatial and temporal resolution [25].…”

Section: Introductionmentioning

confidence: 99%

Combined measurement of velocity and temperature in liquid metal convection

et al. 2019

Self Cite

View full text Add to dashboard Cite

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]

show abstract

Transition between quasi-two-dimensional and three-dimensional Rayleigh-Bénard convection in a horizontal magnetic field

Cited by 31 publications

References 26 publications

Oscillatory thermal–inertial flows in liquid metal rotating convection

Oscillatory thermal–inertial flows in liquid metal rotating convection

Jump rope vortex in liquid metal convection

Combined measurement of velocity and temperature in liquid metal convection

Contact Info

Product

Resources

About