Strouhal Number -- from Eric Weisstein's World of Physics

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Strouhal Number

The dimensionless parameter


where f is the frequency of vortices shed in a vortex street, d is the length scale, and is the speed of fluid flow. Vortices are typically shed when St is approximately 0.2.

Vortex Street


© 1996-2007 Eric W. Weisstein

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