Critical Reynolds Number

Covered in Section 6.3.1, the critical Reynold's Number is the Reynold's number at which the boundary layer flow transitions from laminar to turbulent.

The Critical Reynold's Number is defined in equation 6.24:

Where is the distance at which the flow transitions from laminar to turbulent, is density, is dynamic-viscosity.

is a typical value for Critical Reynolds Number for external flow.

See 9A - 2nd Class for more information.