(Solved):   fluid mechanics. Problem \#2 (8 marks) The figure shows a boundary layer on a flat plate. ...

 

fluid mechanics.

Problem \#2 (8 marks) The figure shows a boundary layer on a flat plate. The velocity of air at \( d \) is given by \( \frac{u}{u}= \) \( 2\left(\frac{y}{\delta}\right)-\left(\frac{y}{\delta}\right)^{2} \), where \( U=15 \mathrm{~m} / \mathrm{s} \). Calculate the friction force on the plate between \( a \) and \( d \) per unit depth. \( \left(\rho_{\text {air }}=1.23 \mathrm{~kg} / \mathrm{m}^{3}\right) \)