Difference between revisions of "Strouhal number"
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A criterion for the similarity of non-stationary motions of liquids or gases. The Strouhal number characterizes the identity of the flow of the processes in the course of time: | A criterion for the similarity of non-stationary motions of liquids or gases. The Strouhal number characterizes the identity of the flow of the processes in the course of time: | ||
| − | + | $$\mathrm{Sh}=\frac{l}{vt}=\frac{\omega l}{v},$$ | |
| − | where | + | where $v$ is the typical velocity of the flow, $l$ is the typical linear dimension, $t$ is the typical period of time for non-stationary motion, and $\omega$ is the typical frequency (the inverse quantity $vt/l$ is sometimes also denoted by Sh). |
| − | The same criterion | + | The same criterion $H_0=vt/l$ in mechanical, thermal and electromagnetic processes is called the homochromity test. |
The Strouhal number is named after V. Strouhal. | The Strouhal number is named after V. Strouhal. | ||
Latest revision as of 08:18, 3 October 2014
A criterion for the similarity of non-stationary motions of liquids or gases. The Strouhal number characterizes the identity of the flow of the processes in the course of time:
$$\mathrm{Sh}=\frac{l}{vt}=\frac{\omega l}{v},$$
where $v$ is the typical velocity of the flow, $l$ is the typical linear dimension, $t$ is the typical period of time for non-stationary motion, and $\omega$ is the typical frequency (the inverse quantity $vt/l$ is sometimes also denoted by Sh).
The same criterion $H_0=vt/l$ in mechanical, thermal and electromagnetic processes is called the homochromity test.
The Strouhal number is named after V. Strouhal.
Comments
References
| [a1] | L.I. Sedov, "Similarity and dimensional methods in mechanics" , Acad. Press (1959) (Translated from Russian) |
How to Cite This Entry:
Strouhal number. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Strouhal_number&oldid=33468
Strouhal number. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Strouhal_number&oldid=33468
This article was adapted from an original article by Material from the article "Strouhal number" in BSE-3 (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article