Strouhal number

From Free net encyclopedia

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

<math> Sr= {f L\over V} </math>

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 200<Re<200,000 it is assumed to be equal to 0.2.de:Strouhal-Zahl fr:Nombre de Strouhal it:Numero di Strouhal nl:Getal van Strouhal