Stability of quasi-Keplerian shear flow in a laboratory experiment

Details Stability of quasi-Keplerian shear flow in a laboratory experiment Stability of quasi-Keplerian shear flow in a laboratory experiment

2011-02-18

arxiv.org/abs/1102.3725v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

21 pages, 13 figures, submitted to Astron. Astrophys

Scientific paper

Context: Subcritical transition to turbulence has been proposed as a source of turbulent viscosity required for the associated angular momentum transport for fast accretion in unstratified Keplerian disks. Aims: To quantify angular momentum transport due to subcritical hydrodynamic turbulence, if exists, in a quasi-Keplerian shear flow. Methods: We perform a local measurement of the azimuthal-radial component of the Reynolds stress tensor in a laboratory apparatus with adequate controls of boundary conditions. Results: We find no evidence of subcritical transitions to turbulence, and thus the ineffective angular momentum transport in such flows at Reynolds number up to two millions. Conclusions: Either subcritical transitions do not occur or even if a subcritical transition does occur in Keplerian flows the associated radial transport of angular momentum is too small to be responsible for fast accretion in astrophysical disks.

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