Figure P5.101 shows a test rig for evaluating the loss
coefficient, K, for a valve. Mechanical energy losses in valves are
modeled by the equation:
where ghL is the mechanical energy loss and V is the flow velocity entering the valve. In a particular test, the pressure gage reads
40 kPa, gage, and the 1.5-m3
catch tank fills in 2 min 55 s.
Calculate the loss coefficient for a water temperature of 20 °C.