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Air, at p = 1 atm and a temperature of 60 ° C enters a...

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Mechanical Engineering

Air, at p = 1 atm and a temperature of 60 ° C enters a thin-walled (d = 5.0 mm) and long (l = 3 m) tube. A constant thermal flow is applied to the air from the tube walls. The mass air flow is 1.5x10^(-04) kg / s. If the temperature on the surface of the tube at its outlet is 120 ° C, determine the rate of heat transfer entering the tube. Use the air properties for 400 K.

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