Rotations and cessations of the large-scale circulation in turbulent Rayleigh-Bénard convection

  title={Rotations and cessations of the large-scale circulation in turbulent Rayleigh-B{\'e}nard convection},
  author={Eric H. Brown and Guenter Ahlers},
We present a broad range of measurements of the angular orientation θ0(t) of the large-scale circulation (LSC) of turbulent Rayleigh-Bénard convection as a function of time. We used two cylindrical samples of different overall sizes, but each with its diameter nearly equal to its height. The fluid was water with a Prandtl number of 4.38. The time series θ0(t) consisted of meanderings similar to a diffusive process, but in addition contained large and irregular spontaneous reorientation events… CONTINUE READING
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