Reynolds number

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Rey·nolds num·ber

(ren'ŏldz),
a dimensionless number that describes the tendency for a flowing fluid, such as blood, to change from laminar flow to turbulent flow or vice versa.

Reynolds,

Osborne, English physicist, 1842-1912.
Reynolds number - a dimensionless number that describes the tendency for a flowing fluid, such as blood, to change from laminar flow to turbulent flow or vice versa.