If the length of the plate is more than laminar zone (x), the thickness of boundary layer increase in downstream direction due to the increase in ‘Rex’. The layer became unstable and boundary layer changes from laminar to turbulent over a short length i.e in transits zone. The layer continue to increase in downstream, such a layer is called as Turbulent boundary layer.

(R_e)x  > 5 x 105, the layer is turbulent boundary layer.

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