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Definition of REYNOLDS NUMBER
: a number characteristic of the flow of a fluid in a pipe or past an obstruction
Origin of REYNOLDS NUMBER
Osborne Reynolds †1912 English physicist
First Known Use: 1910
In fluid mechanics, a number that indicates whether the flow of a fluid (liquid or gas) is absolutely steady (in streamlined, or laminar flow) or on the average steady with small, unsteady changes (in turbulent flow; seeturbulence). The Reynolds number, abbreviated N or Re, has no dimensions (seedimensional analysis) and is defined as the size of the flowas, for example, the diameter of a tube (D) times the average speed of flow (v) times the mass density of the fluid ()divided by its absolute viscosity (). Osborne Reynolds demonstrated in 1883 that the change from laminar to turbulent flow in a pipe occurs when the value of the Reynolds number exceeds 2,100.