A vortex line is an imaginary line whose tangent at each point at the given instant of time coincides in direction with the velocity vector curl at this point. The vortex strength is the product of the magnitude of vector curl in some normal cross section of the vortex tube by the area of this cross section. The vortex strength is constant along the whole vortex tube and is equal to the velocity circulation along an arbitrary closed curve drawn on the surface of the vortex tube and encircling it.
Wednesday, January 21, 2009
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