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Reynolds number
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Reynolds number

Number used in fluid mechanics to determine whether fluid flow in a particular situation (through a pipe or around an aircraft body or a fixed structure in the sea) will be turbulent or smooth. The Reynolds number is calculated using the flow velocity, density, and viscosity of the fluid, and the dimensions of the flow channel. It is named after Irish engineer Osborne Reynolds.

The Reynolds number for the wing of a Boeing 747 is 7 × 107 and that for a nuclear submarine is 109.



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