Abstract
Detailed experiments have been made for the effect of the adverse pressure gradients on the law of the wall in turbulent boundary layers. The wall shear stress was measured by a direct measurement device and scaling law of the mean velocity was discussed with high accuracy experimental data. Consequently it was seen that ignoring the inertia term in the equation of motion was not allowed in the inner layer because of the effects of the adverse pressure gradients. By considering significant contribution of the inertia term, a new velocity scale is defined and a similarity law was yielded for the mean velocity profile, which agrees well to the experimental data.
