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{\rm Re} = \frac{u \, Dd}{\nu} = \frac{\rho \, u \, Dd}{\mu} |
where
| average cross-sectional flow velocity | ||||
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| characteristic linear dimension of the fluid conduit | ||||
| fluid density | ||||
| dynamic viscosity | ||||
| kinematic viscosity |
The physical meaning of Reynolds number is the ratio of Inertial forces to Viscous forces:
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{\rm Re} = \frac{{\rm Inertial} \ {\rm forces}}{{\rm Viscous} \ {\rm forces}} = \frac{u \, Dd}{\nu} |
See also
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Physics / Fluid Dynamics / Fluid flow regimes
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