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Dimensionless quantity in fluid mechanics characterising the ratio of inertial forces to viscous forces and corresponding fluid flow regime:
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{\rm Re} = \frac{vu \, Ld}{\nu} = \frac{\rho \, vu \, Ld}{\mu} |
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where
The physical meaning of of Reynolds number is the ratio of intertial Inertial forces and viscous to Viscous forces:
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{\rm Re} = \frac{{\rm Inertial} \ {\rm forces}}{{\rm Viscous} \ {\rm forces}} = \frac{u \, d}{\nu} |
See also
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Physics / Fluid Dynamics / Fluid flow regimes
[ Reynolds number in Pipe Flow]