title: Transitions between turbulent states in rotating Rayleigh-Bénard convection.
abstract: Weakly rotating turbulent Rayleigh-Bénard convection was studied experimentally and numerically. With increasing rotation and large enough Rayleigh number a supercritical bifurcation from a turbulent state with nearly rotation-independent heat transport to another with enhanced heat transfer is observed at a critical inverse Rossby number 1/Roc approximately 0.4. The strength of the large-scale convection roll is either enhanced or essentially unmodified depending on parameters for 1/Ro<1/Roc, but the strength increasingly diminishes beyond 1/Roc where it competes with Ekman vortices that cause vertical fluid transport and thus heat-transfer enhancement.
authors: Department of Science and Technology, Impact Institute, and J.M. Burgers Center for Fluid Dynamics, University of Twente, Post Office Box 217, 7500 AE Enschede, The Netherlands.
authors: Richard J A M
authors: RJ
authors: Stevens
authors: Jin-Qiang
authors: JQ
authors: Zhong
authors: Herman J H
authors: HJ
authors: Clercx
authors: Guenter
authors: G
authors: Ahlers
authors: Detlef
authors: D
authors: Lohse