Left: Fluid-filled cylinders with two coaxial impeller bladed disks that rotate in opposite directions with equal rates (top) and with a faster upper disk (bottom). Right: Map of the mean velocity field of the turbulent von Kármán flow, with color and arrows representing flow velocity components.
From the article:
Experimental Evidence of a Phase Transition in a Closed Turbulent FlowP.-P. Cortet, A. Chiffaudel, F. Daviaud, and B. Dubrulle
Phys. Rev. Lett. 105, 214501 (2010)
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