Assume that the pipe in Problem 7 .4 has a very smooch surface and that the water temperature is 65°F, compute (a) velocity at the center of the pipe, and (b) thickness of the boundary layer. Problem...

Assume that the pipe in Problem 7 .4 has a very smooch surface and that the water temperature is 65°F, compute (a) velocity at the center of the pipe, and (b) thickness of the boundary layer.

Problem 7 .4

Water is flowing in a 12-inch pipe inclined downward on a slope of 10% as shown in Figure P7.4. The discharge is 1000 gpm and piezometers located 30 ft apart measure a difference in piezometers head of 0.1 ft. (a) What is the pressure drop across the pipe? (b) What is the shear stress exerted on the pipe boundary? (c) What is the shear velocity? (d) What is the Darcy friction factor?