1. Using Blasius’ correlation for shear stress (equation 12- 68), develop an expression for the local skin-friction coefficient in pipes. In pipes, the average velocity is used for the friction...

1. Using Blasius’ correlation for shear stress (equation 12- 68), develop an expression for the local skin-friction coefficient in pipes. In pipes, the average velocity is used for the friction coefficient and the Reynolds number. Use the one-seventh-power law.

2. For a thin a plate 6 in. wide and 3 ft long, estimate the friction force in air at a velocity of 40 fps, assuming

a. turbulent flow;

b. laminar flow.

The flow is parallel to the 6-in. dimension.