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- W2334457314 abstract "We performed laboratory experiments of Rayleigh-B'enard convection with liquid gallium under various intensities of a uniform imposed horizontal magnetic field. An ultrasonic velocity profiling method was used to visualize the spatiotemporal structure of the flows with simultaneous monitoring of the temperature fluctuations in the liquid gallium layer. The explored Rayleigh numbers Ra range from the critical value for onset of convection to ${10}^{5}$; the Chandrasekhar number $Q$ covers values up to 1100. A regime diagram of the convection patterns was established in relation to the Ra and $Q$ values for a square vessel with aspect ratio 5. We identified five flow regimes: (I) a fluctuating large-scale pattern without rolls, (II) weakly constrained rolls with fluctuations, (III) a continuous oscillation of rolls, (IV) repeated roll number transitions with random reversals of the flow direction, and (V) steady two-dimensional (2D) rolls. These flow regimes are classified by the Ra/$Q$ values, the ratio of the buoyancy to the Lorentz force. Power spectra from the temperature time series indicate that regimes I and II have the features of developed turbulence, while the other regimes do not. The region of steady 2D rolls (Busse balloon) extends to high Ra values in the present setting by a horizontal magnetic field and regime V is located inside the Busse balloon. Concerning the instabilities of the steady 2D rolls, regime III is the traveling wave convection developed from the oscillatory instability. Regime IV can be regarded as a state of phase turbulence, which is induced by intermittent occurrences of the skewed-varicose instability." @default.
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- W2334457314 date "2013-12-30" @default.
- W2334457314 modified "2023-09-23" @default.
- W2334457314 title "Convection patterns in a liquid metal under an imposed horizontal magnetic field" @default.
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- W2334457314 doi "https://doi.org/10.1103/physreve.88.063020" @default.
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