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J. Fluid Mech. (2010), vol. 665, pp. 300333. c Cambridge University Press 2010 doi:10.1017/S002211201000399X
 

Summary: J. Fluid Mech. (2010), vol. 665, pp. 300­333. c Cambridge University Press 2010
doi:10.1017/S002211201000399X
Heat transport and the large-scale circulation in
rotating turbulent Rayleigh­B´enard convection
JIN-QIANG ZHONG AND GUENTER AHLERS
Department of Physics, University of California, Santa Barbara, CA 93106, USA
(Received 6 May 2010; revised 20 July 2010; accepted 20 July 2010;
first published online 26 October 2010)
Measurements of the Nusselt number Nu and of properties of the large-scale
circulation (LSC) for turbulent Rayleigh­B´enard convection are presented in the
presence of rotation about a vertical axis at angular speeds 0 6 < 2 rad s-1
. The
sample chamber was cylindrical with a height equal to the diameter, and the fluid
contained in it was water. The LSC was studied by measuring sidewall temperatures
as a function of azimuthal position. The measurements covered the Rayleigh-
number range 3 × 108 < Ra < 2 × 1010
, the Prandtl-number range 3.0 < Pr < 6.4 and
the Rossby-number range 0 6 (1/Ro ) < 20. At modest 1/Ro, we found an
enhancement of Nu due to Ekman-vortex pumping by as much as 20 %. As 1/Ro
increased from zero, this enhancement set in discontinuously at and grew above

  

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

 

Collections: Physics