Boundary layer thickness (For laminar boundary layers over a flat plate)


The boundary layer thickness is the distance across a boundary layer from the wall to a point where the flow velocity has essentially reached (99%)the 'free stream’ velocity.

Related formulas


δThe overall thickness (or height) of the boundary layer (m)
νKinematic viscosity (m2/s)
xThe distance downstream from the start of the boundary layer (m)
u0The freestream velocity (m/s)