Just thought some of you might find this interesting and it demonstrates how speed in the Reynolds formula above has a great effect on separation.
http://www.nar-associates.com/techni...ide_screen.pdf
These flight tests in an arrow with and without vortex generators:
With VGs: Vs = 53 and Vso = 50
Without VGs: Vs = 60 and Vso = 53
Even with only a slightly faster speed, only about 10 knots, the difference with and without was 7 where as the slower speed was only 3.
Great article though, good explanation of how VGs work and fairly non technical.