9.10 Velocity profiles in laminar boundary layers often are approximated by the equations Linear: и = U 96 Sinusoidal : u = U sin (3) u Parabolic : = = 2() - (²)² 2 Compare the shapes of these velocity profiles by plotting y/8 (on the ordinate) versus u/U (on the abscissa). 9.14 The velocity profile in a turbulent boundary layer often is approximated by the power-law equation 1/7 Compare the shape of this profile with the parabolic laminar boundary-layer velocity profile (Problem 9.10) by plotting y/ (on the ordinate) versus u/U (on the abscissa) for both profiles.