Ultimate Turbulent Taylor-Couette Flow

Huisman, S.G. and Gils van, D.P.M. and Grossman, G. and Sun, C. and Lohse, D. (2012) Ultimate Turbulent Taylor-Couette Flow. Physical review letters, 108 (2). 024501-1 - 024501-5. ISSN 0031-9007

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Abstract:	The flow structure of strongly turbulent Taylor-Couette flow with Reynolds numbers up to Rei=2×106 of the inner cylinder is experimentally examined with high-speed particle image velocimetry (PIV). The wind Reynolds numbers Rew of the turbulent Taylor-vortex flow is found to scale as Rew∝Ta1/2, exactly as predicted by Grossmann and Lohse [ Phys. Fluids 23 045108 (2011)] for the ultimate turbulence regime, in which the boundary layers are turbulent. The dimensionless angular velocity flux has an effective scaling of Nuω∝Ta0.38, also in correspondence with turbulence in the ultimate regime. The scaling of Nuω is confirmed by local angular velocity flux measurements extracted from high-speed PIV measurements: though the flux shows huge fluctuations, its spatial and temporal average nicely agrees with the result from the global torque measurements
Item Type:	Article
Copyright:	© American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Fluids (POF)
Link to this item:	http://purl.utwente.nl/publications/79931
Official URL:	http://dx.doi.org/10.1103/PhysRevLett.108.024501
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