Reynolds number is defined as follows:
where &rho is the specific gravity of the fluid, U -- it's velocity, D
-- the diamater of flow, and &mu -- the viscosity.
Reynolds found that when a fluid flow is associated with a Re of
under 2100, the flow is laminar. If it is associated with a Re > 4000,
the flow is turbulent. And in between -- borderline.
No clear theoretical basis for this observation, but it has been borne
out for various values of &rho, U, D, and &mu, and various fluids.
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