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heat transfer problem A counterflow concentric tube heat exchanger is used to cool lubricant oil of...

heat transfer problem

A counterflow concentric tube heat exchanger is used to cool lubricant oil of a big gas turbine. The cooling water's flow rate through the interior aluminum tube (Di= 25mm) is 0.2kg/seg, while the oil's flow rate through the exterior ring (Do= 45mm) is 0.1kg/seg. The oil and the water enter at 100°C and 30°C respectively. How long does the tube have to be for oil to leave at 60°C?

Oil at 80°C

Cp = 2131 J/Kg K , µ=725 X 10-6 N*s/m^2,    k = 0.138 W/mK

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