Smoke rings

Smoke rings

F012/2926 Royalty Free

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Caption: Smoke rings. This is a poloidal (rotating) vortex flow that is stable for considerable distances in still air. The rotating flow is maintained by the viscous friction between the moving ring and the stationary air outside it.

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Keywords: aerodynamics, air, atmosphere, atmospheric, black background, calm, close up, close up shot, close up view, close-up, close-up shot, close-up view, closeup, closeup shot, closeup view, dynamics, ethereal, floating, flow, fluid, no one, no-one, nobody, plain background, poloidal, rotating, rotation, school science, science education, smoke, smoke ring, still, studio shot, studio shots, toroid, torus, viscous friction, visualisation, visualised, vortex

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