For the system illustrated in Figure, the diameter at section 1 is 16 in. and that at sec...

For the system illustrated in Figure, the diameter at section 1 is 16 in. and that at section 2 is 8 in. The flow rate through the pipe is 6.0 cfs, and the pressure at section 1 is 50 psi. What is the pressure in the constriction at section 2?

FIGURE

Because the velocity and kinetic energy of the water flowing in the constricted section must increase, the potential energy must decrease (from the law of energy conservation). This is observed as a pressure drop in the constriction.