Chapter 9, Problem 48P

Standard air flows over a horizontal smooth flat plate at free-stream speed U = 20 m/s. The plate length is L = 1.5 m and its width is b = 0.8 m. The pressure gradient is zero. The boundary layer is tripped so that it is turbulent from the leading edge; the velocity profile is well represented by the $\frac{1}{7}$-power expression. Evaluate the boundary-layer thickness, δ, at the trailing edge of the plate. Calculate the wall shear stress at the trailing edge of the plate. Estimate the skin friction drag on the portion of the plate between x = 0.5 m and the trailing edge.