Hi Are you aware of these? http://en.wikipedia.org/wiki/Taylor_column : "A rotating fluid has a specific kind of rigidity, it does not quite act like a fluid anymore."
It seems to explain a lot of vortex phenomena. The effect was described in 1868 and are not mysterious at all. There will be layers in a vortex since the hardness vary with rotation speed I am very surprised that this effect isn't referred to for vortices since it has been known for 143 years. David David Jonsson, Sweden, phone callto:+46703000370
