Abstract
A newly developed high-density particle tracking velocimetry (HD-PTV) technique is introduced and validated on a synthetic data set. Further, Lagrangian velocities in turbulent Rayleigh-Benard Convection (RBC) are determined based on particle images measured in a cubic sample filled with water with a Prandtl number Pr\(\,=\,\)6.9 and a Rayleigh number of Ra\(\,=\,\) \(1.0\cdot 10^{10}\). It is shown that the new technique allows to resolve not only a three-dimensional (3D) large-scale circulation in a diagonal plane of the sample but also the secondary flow structures developing in the corners of the perpendicular plane.
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