This means that for air flow with the same air and plate temperatures and free stream velocity, the average heat transfer coefficient for a long plate is larger than the average heat transfer coefficient for a short plate the same as the average heat transfer coefficient for a short plate smaller than the average heat transfer coefficient for a short plate

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]