Transitions between turbulent states in rotating Rayleigh-Benard convection

Details Transitions between turbulent states in rotating Rayleigh-Benard convection Transitions between turbulent states in rotating Rayleigh-Benard convection

2009-01-14

arxiv.org/abs/0901.2016v1

Phys. Rev. Lett. 103, 024503 (2009)

Physics

Fluid Dynamics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.024503

Weakly-rotating turbulent Rayleigh-Benard convection was studied experimentally and numerically. With increasing rotation and large enough Rayleigh number an abrupt transition from a turbulent state with nearly rotation-independent heat transport to another turbulent state with enhanced heat transfer is observed at a critical inverse Rossby number $1/Ro_c \simeq 0.4$. Whereas for $1/Ro < 1/Ro_c$ the strength of the large-scale convection-roll is either enhanced or essentially unmodified depending on parameters, its strength is increasingly diminished beyond $1/Ro_c$ where it competes with Ekman vortices that cause vertical fluid transport and thus heat-transfer enhancement.

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