Strouhal number
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| - | The Strouhal | + | The Strouhal number is a dimensionless parameter describing the oscillating frequency of a flow. Usually it is defined as: |
<br> | <br> | ||
:<math> | :<math> | ||
| - | St = \frac{fL}{U} | + | St := \frac{fL}{U} |
</math> | </math> | ||
where <math>f</math> is the frequency of the flow (e.g. vortex shedding frequency), <math>L</math> is a characteristic length scale of the flow and <math>U</math> is a characteristic velocity. | where <math>f</math> is the frequency of the flow (e.g. vortex shedding frequency), <math>L</math> is a characteristic length scale of the flow and <math>U</math> is a characteristic velocity. | ||
<p> | <p> | ||
| - | The Strouhal Number is a function of the [[Reynolds | + | The Strouhal Number is a function of the [[Reynolds number]], typically between 20 < Re < 20,000. |
| + | |||
| + | [[Category:Dimensionless parameters]] | ||
Latest revision as of 03:34, 20 September 2005
The Strouhal number is a dimensionless parameter describing the oscillating frequency of a flow. Usually it is defined as:
where 
is the frequency of the flow (e.g. vortex shedding frequency), 
is a characteristic length scale of the flow and 
is a characteristic velocity.
The Strouhal Number is a function of the Reynolds number, typically between 20 < Re < 20,000.
