Abstract
Abstract
Highlights
Taylor–Couette (TC) flow is of considerable scientific interest, because it allows us to study turbulence under the effects of shear, rotation and wall curvature in a controlled way (Grossmann, Lohse & Sun 2016)
We present tomographic-particle image velocimetry (PIV) measurements, which reveal the full three-dimensional changes in the large-scale flow structure associated with the transitions in torque scaling and optimal angular momentum transport
In order to gain a better understanding of the transitions in flow structure, we introduce a triple-decomposition u = U + uL + uS, where the instantaneous velocity field u is split into the time-averaged mean velocity U, and the fluctuations u
Summary
Taylor–Couette (TC) flow is of considerable scientific interest, because it allows us to study turbulence under the effects of shear, rotation and wall curvature in a controlled way (Grossmann, Lohse & Sun 2016). These could previously not be observed in planar PIV measurements, and three-dimensional velocity fields are required to fully appreciate these changes. We present tomographic-PIV measurements, which reveal the full three-dimensional changes in the large-scale flow structure associated with the transitions in torque scaling and optimal angular momentum transport. Both the magnitude and orientation of the large-scale structure are shown to change significantly through the transitions between the different flow regimes. We determine the contribution of the large scales to the overall torque
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