Water flowing in a horizontal 25-cm-diameter pipe at 9 m/s and 300 kpa gage enters a 90° bend reducing section, which connects to a 15-cm-diameter vertical pipe. the inlet of the bend is 50 cm above the exit. neglecting any frictional and gravitational effects, determine the net resultant force exerted on the reducer by the water. take the momentum-flux correction factor to be 1.04.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]