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Under consideration for publication in J. Fluid Mech. 1 The large-scale flow structure in turbulent
 

Summary: Under consideration for publication in J. Fluid Mech. 1
The large-scale flow structure in turbulent
rotating Rayleigh-B´enard convection
Stephan Weiss and Guenter Ahlers
Department of Physics, University of California, Santa Barbara, CA 93106, USA
(Received 1 June 2011)
We report on the influence of rotation about a vertical axis on the large-scale circulation
(LSC) of turbulent Rayleigh-B´enard convection in a cylindrical vessel with aspect ratio
D/L = 0.50 (D is the diameter and L the height of the sample). The working fluid
was water at an average temperature Tav = 40 with a Prandtl number Pr = 4.38. For
rotation rates < 1 rad s-1
, corresponding to inverse Rossby numbers 1/Ro between
zero and twenty, we investigated the temperature distribution at the side wall and from it
deduced properties of the LSC. The work covered the Rayleigh-number range 2.3×109 <
Ra < 7.2 × 1010
. We measured the vertical side-wall temperature-gradient, the dynamics
of the LSC, and flow-mode transitions from single-roll states (SRS) to double-roll states
(DRS). We found that modest rotation stabilizes the SRS. For modest 1/Ro < 1 we found
the unexpected result that the vertical LSC plane rotated in the prograde direction (i.e.
faster than the sample chamber), with the rotation at the horizontal mid-plane faster

  

Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara

 

Collections: Physics