Circulation
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Circulation
1. The flow or motion of a fluid in or through a given area or volume.
2. A precise measure of the average flow of fluid along a given closed
curve. Mathematically, circulation is the line integral.
is the fluid velocity, and dr is a vector element of the curve.
By Stokes theorem, the circulation about a plane curve is equal
to the total vorticity of the fluid enclosed by the curve.
The given curve
may be fixed in space or may be defined by moving fluid parcels.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use