[bigben2k]

Googl'ing through the web, it seems that turbulent flow is achieved somewhere between Reynolds 2000 to 4000, as far as I've searched (opinions DO vary!).

Here are some of the links that I found.

http://www.mas.ncl.ac.uk/~sbrooks/bo...p07/node9.html
("Turbulent Reynolds stress" for Dave!)

http://www.wikipedia.org/wiki/Reynolds_number
(basic definition)

http://www.ichmt.org/abstracts/MECT-...tracts/2-2.pdf
(You'll like this one Dave!)

http://www.nag.co.uk/simulation/Fast...html/node8.htm
("Theory of laminar and turbulent flow")

http://psdam.mit.edu/2.000/Administr...ulent-Flow.pdf
(simplistic, but there)

http://www.efm.leeds.ac.uk/CIVE/CIVE..._turbulent.htm
(dye experiment)

http://www.sigmaxi.org/amsci/article...demenos-5.html
(a medical perspective!)

http://wuche.wustl.edu/~sato/flowtrans/flowtrans2a.html
(Reynold's experiment)

http://www.icase.edu/Dienst/Reposito...e/TR-99-33/pdf
("Streamwise Vorticity Generation in laminar and turbulent jets")

http://home.olemiss.edu/~cmprice/lectures/turb.html
(some basics about turbulent flow)

http://www.uts.com/products/tkintro.html
(A software)

http://www.me.mtu.edu/courses/me328/...328formula.pdf
(A formulae roundup)