A double-pipe heat exchanger consists of two concentric tubes with one fluid flowing in the central tube and the other flowing in the annulus between the tubes. In a particular exchanger, cold (15 o...

A double-pipe heat exchanger consists of two concentric

tubes with one fluid flowing in the central tube and the other flowing in the annulus between the tubes. In a particular exchanger,

cold (15 o

C) water flows at 300 liters/min through a 10 cm diameter inner tube and hot (50 o

C) SAE 30 oil flows at 400 liters/min

in the annulus between the inner tube and a 12 cm diameter outer

tube. The heat exchanger is 2 m in length. (a) Calculate the pressure drop in the oil stream (b) Can you calculate the pressure drop

in the water using the same equations? Why or why not?