Water flows at 50oC inside a 2.5-cm-inside-diameter tube such that hi= 3500 W/m2 oC. The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m2 oC. The outside of the tube loses heat by free convection with ho = 7.6 W/m2 oC. Calculate the overall heat-transfer coefficient and heat loss per unit length to surrounding air at 20oC.
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