Compute the resulting pressure after a “real” diffuser in which the energy loss due to the enlargement is considered for the data presented in Problem 10.12. The enlargement is gradual with cone angles of 

(a) 60°, 

(b) 30°, 

(c) 10°. Compare the results with those of Problems 10.12 and 10.13.

In Problem

Another term for an enlargement is a diffuser. A diffuser is used to convert kinetic energy (v²/2g) to pressure energy (p/g). An ideal diffuser is one in which no energy losses occur and Bernoulli’s equation can be used to compute the pressure after the enlargement. Compute the pressure after the enlargement for an ideal diffuser for the flow of water at 20°C from a 25 mm OD × 2.0 mm wall copper tube to an 80 mm OD × 2.8 mm wall copper tube. The volume flow rate is 150 L/min and the pressure before the enlargement is 500 kPa.