Correct Answer - Option 1 :
\(\frac{{fd}}{V}\)
Explanation:
The Strouhal Number is a dimensionless value useful for analyzing oscillating unsteady fluid flow dynamics problems. It is used in Karman vortex trial phenomenon.
The Strouhal Number can be expressed as
S = f d / v
Where,
S = Strouhal Number
f = Oscillation frequency
d = Characteristic length
V = Flow velocity
For a circular section cylinder, this number remains, in a wide range of Reynolds, approximately constant and equal to 0.2. This is an experimental fact.
