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The Reynolds number for a fluid with density d, free-stream velocity V, viscosity u at a distance x from the leading edge is_____(a) R = \(\frac {Vd}{ux}\)(b) R = \(\frac {xVd}{u}\)(c) R = \(\frac {Vx}{dx}\)(d) R = \(\frac {xdu}{V}\)This question was posed to me in a job interview.The question is from Laminar Flow topic in portion Incompressible Flow over Airfoils of Aerodynamics

Answer» RIGHT OPTION is (b) R = \(\FRAC {xVd}{u}\)

The explanation is: Reynolds number is an important quantity in the STUDY of fluid dynamics and aerodynamics. The correct formula is R = \(\frac {xVd}{u}\). It is important to remember that it is a DIMENSIONLESS quantity.


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