Strouhal number (original) (raw)

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

Sr = f*D/V

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

<re<200,000 it="" is="" assumed="" to="" be="" equal="" 0.2.<p=""> See also: dimensionless number (which includes a listing of other dimensionless numbers)</re<200,000>