Water flows through a horizontal 60-mm-diameter galvanized iron pipe at a rate of 0.02 m 3/s. if the pressure drop is 135 kpa per 10 m of pipe, do you think this pipe is

(a) a new pipe,

(b) an old pipe with a somewhat increased roughness due to aging, or

(c) a very old pipe that is partially clogged by deposits

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]