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Additional recommended knowledge
A swirling flow in a viscous fluid is characterized by a forced vortex in the central core, surrounded by a free vortex. The Rankine vortex best describes this phenomenon. (The velocity profile through an ideal vortex in an inviscid fluid consists entirely of the free vortex with an infinite velocity at its centre. There is no low velocity core.)
The mathematical model for the velocity at radius r in the Θ direction in the Rankine vortex is:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rankine_vortex". A list of authors is available in Wikipedia.|