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. Stock Illustration

Stock Illustration - 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.. Fotosearch

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
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