I was looking around in Rayleigh's Theory of Sound Vol 2 last night, and ran
across a treatment of what looked like the vortices you mention. Even had some
sketches of the motions.
--
Mike
===============================================================
Mike Moloney moloney@nextwork.rose-hulman.edu
Dept of Physics & Applied Optics (812) 877 8302
Rose-Hulman Institute of Technology Terre Haute, IN 47803 http://www.rose-hulman.edu/~moloney