•    Laminar sub layer is the region in the region in the turbulent boundary layer zone, adjacent to the solid surface of the plate.

•    The velocity variation in this region is assumed linear as it’s a very thin layer and so that velocity gradient (du / dy) can be considered constant.

•    Shear stress in laminar sub-layer

τ₀  =  μ (du / dy)_{y = 0}          For linear variation du / dy = u / y

τ₀  =  μ (u/y)

For more help in Laminar Sub-Layer click the button below to submit your homework assignment τ μ