For Reynolds, Osborne (1842-1912) we have a term and definition in Airfoil.

Reynolds, Osborne (1842-1912) (Airfoil)

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.

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