When a flat smooth plate is placed parallel to the direction of flow, the flow in the boundary layer is laminar though the main flow is turbulent near to the leading edge of plate. This layer of fluid is said to be Laminar boundary layer.


(R_e)_x  =  Ux / v

Where   x  = Distance from leading edge
             U  = Free stream velocity
             v  =  Kinematic viscosity

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