| Issue |
EPL
Volume 143, Number 2, July 2023
|
|
|---|---|---|
| Article Number | 23001 | |
| Number of page(s) | 7 | |
| Section | Fluid and nonlinear dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/acdea1 | |
| Published online | 10 July 2023 | |
Transition to the ultimate turbulent regime in a very wide gap Taylor-Couette flow (η = 0.1) with a stationary outer cylinder
Department of Aerodynamics and Fluid Mechanics, Brandenburg University of Technology Cottbus-Senftenberg Siemens-Halske-Ring 15a, 03046 Cottbus, Germany
(a) E-mail: hamede@b-tu.de (corresponding author)
Received: 24 March 2023
Accepted: 15 June 2023
The boundary layers in turbulent Taylor-Couette flow are exposed to transitions from laminar to turbulent states if the flow is sufficiently sheared. The present study examines this particular transition from the so-called “classical” to “ultimate” regime experimentally for a very wide-gap Taylor-Couette flow with a radius ratio of 
and shear Reynolds numbers of up to 
. In order to determine the transition, the angular momentum transport is measured by using torque sensors at the inner wall. This is complemented by measuring the radial and azimuthal velocities via a time-resolved Particle-Image-Velocimetry (PIV). The transition to the ultimate regime is found at 
. The dimensionless angular momentum flux showed an effective scaling of 
for 
and is in agreement with the scaling laws used for the ultimate regime in narrow-gap Taylor-Couette flows. In addition, a spectral analysis was performed showing the existence of highly energetic small-scale and large-scale patterns in the classical regime whereas only highly energetic large-scale patterns were observed in the ultimate regime.
© 2023 The author(s)
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