2024
DOI: 10.21203/rs.3.rs-4559376/v1
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Large scale reorientation in cubic Rayleigh-Bénard convection using particle tracking velocimetry

Robin Barta,
Claus Wagner

Abstract: We measured the three-dimensional velocity field of a large-scale reorientation in turbulent Rayleigh-Bénard convection with a high Rayleigh number Ra = $2.5\cdot 10^9$ by long-term particle tracking velocimetry measurements over 30 hours in a water-filled cubic cell with a side length of $L=300$ mm. Reorientations are characterized by the large-scale circulation in the flow changing its orientation from one cell diagonal to the other, and they are rare events; one can expect about one reorientation per day in… Show more

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