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Inside surface of a 0.05 m diameter pipe is maintained at 100°C thanks to the condensing...

Inside surface of a 0.05 m diameter pipe is maintained at 100°C thanks to the condensing vapor on the outer surface of the pipe. Water mass flow rate through the pipe is ?̇ = 0.01kg/s and it enters the pipe at a temperature of Ti=20°C. How long should the pipe be to increase the temperature of water to To=80°C?

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