The Wide World of Fluids article titled "New Hi-tech Fountains,". The fountain shown in Fig. P8.55 is designed to provide a stream of water that rises \(h=10 \mathrm{ft}\) to \(h=20 \mathrm{ft}\) above the nozzle exit in a periodic fashion. To do this the water from the pool enters a pump, passes through a pressure regulator that maintains a constant pressure ahead of the flow control valve. The valve is electronically adjusted to provide the desired water height. With \(h=10 \mathrm{ft}\) the loss coefficient for the valve is \(K_{L}=\) 50. Determine the valve loss coefficient needed for \(h=20 \mathrm{ft}\). All losses except for the flow control valve are negligible. The area of the pipe is 5 times the area of the exit nozzle.

Figure P8.55

Transcribed Image Text:

Pump h 4 ft Flow control valve Pressure regulator