Momentum Balance on a Reducing Elbow and Friction Losses. Water at 20°C is flowing through a reducing bend, where a2 (see fig below) is 120°. The inlet pipe diameter is 1.829 m, the outlet is 1.219 m, and the flow rate is 8.50 m³/s. The exit point z2 is 3.05 m above the inlet and the inlet pressure is 276 kPa gage. Friction losses are estimated as 0.5v22/2and the mass of water in the elbow is 8500 kg. Calculate the forces Rx and Ry and the resultant force on the control-volume fluid. V1, P1 1 Ry U2, P2 'L. Rx