Local measurements of turbulent angular momentum transport in circular Couette flow |
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| Authors: | M J Burin E Schartman H Ji |
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| Affiliation: | (1) Department of Physics, California State University, San Marcos, CA, USA;(2) Nova Photonics, Inc., One Oak Place, Princeton, NJ 08540, USA;(3) Plasma Physics Laboratory, Princeton University, Princeton, NJ, USA |
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| Abstract: | We report on velocity fluctuations and the fluctuation-driven radial transport of angular momentum in turbulent circular Couette
flow. Our apparatus is short (cylinder height to gap width ratio Γ ~ 2) and of relatively high wall curvature (ratio of cylinder
radii η ~ 0.35). Fluctuation levels and the mean specific angular momentum are found to be roughly constant over radius, in
accordance with previous studies featuring narrower gaps. Synchronized dual beam Laser Doppler Velocimetry (2D LDV) is used
to directly measure the r − θ Reynolds stress component as a function of Reynolds number (Re), revealing approximate scalings in the non-dimensional angular momentum transport that confirm previous measurements of
torque in similar flows. 2D LDV further allows for a decomposition of the turbulent transport to assess the relative roles
of fluctuation intensity and r − θ cross-correlation. We find that the increasing angular momentum transport with Re is due to intensifying absolute fluctuation levels accompanied by a slightly weakening cross-correlation. |
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