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Strouhal NumberIn dimensional analysis, the Strouhal number is a dimensionless number describing oscillating flow mechanisms. Often, it is given as -
where Sr is the Strouhal number, f is the frequency of vortex shedding, D is the hydraulic diameter of the object in the fluid flow and V is the velocity of the fluid. The Strouhal number is a function of the Reynolds number Re and in the region 200
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