Checkout Martin Hepperle's page:

http://beadec1.ea.bs.dlr.de/Airfoils/glossary.htm#TermReynolds

Osborne Reynolds (1842-1912)
Worked for 37 years as a professor of engineering at the university of
Manchester, Great Britain. In 1883 his experiments lead him to the
definition of a dimensionless parameter, which indicated transition from
laminar to turbulent flow in pipes. This parameter was later known as
Reynolds number.
For the flow inside a tube of diameter l he determined the critical value of
this parameter to be 2300.

Reynold's number is a very important parameter in fluid dynamics. Flows at
the same Reynolds number are similar, which make it possible to use smaller
models (length l) for tests at higher velocities (velocity v) to achieve the
same Reynolds number as the full scale airplane.


Bill Swingle
[EMAIL PROTECTED]
Janesville, CA


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