Strouhal number: Difference between revisions
From Glossary of Meteorology
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|Display title=Strouhal number | |||
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|Meaning=A [[nondimensional number]] occurring in the study of periodic or quasiperiodic variations in the [[wake]] of objects immersed in a fluid [[stream]]. | |||
|Explanation=The phenomena are due to the more or less regular formation of vortices or [[vortex streets]] in the wake (especially at [[Reynolds numbers]] around 100 in the case of circular cylinders): <blockquote>[[File:ams2001glos-Se77.gif|link=|center|ams2001glos-Se77]]</blockquote> where ''n'' is a [[frequency]], ''D'' a representative length, and ''U'' a representative [[velocity]] of the stream. Common examples are [[aeolian sounds]] such as those produced by electric power or telephone lines in a [[wind]]. | |||
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Latest revision as of 08:43, 30 March 2024
A nondimensional number occurring in the study of periodic or quasiperiodic variations in the wake of objects immersed in a fluid stream.
The phenomena are due to the more or less regular formation of vortices or vortex streets in the wake (especially at Reynolds numbers around 100 in the case of circular cylinders):
where n is a frequency, D a representative length, and U a representative velocity of the stream. Common examples are aeolian sounds such as those produced by electric power or telephone lines in a wind.
