Strouhal number

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In dimensional analysis, the Strouhal number is a dimensionless number describing oscillating flow mechanisms. Often, it is given as

[ Sr= ]

where Sr is the Strouhal number, f is the frequency of vortex shedding, L is the characteristic length (for example hydraulic diameter) and V is the velocity of the fluid. The Strouhal number is a function of the Reynolds number Re and in the region 200Vincenc Strouhal.

 

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