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Dimensionless quantity in fluid mechanics:

{\rm Re} = \frac{v \, L}{\nu} = \frac{\rho \, v \, L}{\mu}


Dimension = dimensionless


The physical meaning of Reynolds number is the ratio of intertial forces and viscous forces:

 

{\rm Re} = \frac{{\rm Inertial} \ {\rm forces}}{{\rm Viscous}  \ {\rm forces}}


See also


Physics / Fluid Dynamics / Fluid flow regimes