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GATE Mechanical Engineering (ME) 2020 Shift 2 Solved Paper

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Question : 60

Total: 65

Water flows through a tube of 3cm internal diameter and length 20m. The outside surface of the tube is heated electrically so that it is subjected to uniform heat flux circumferentially and axially. The mean inlet and exit temperatures of the water are 10∘C and 70∘C, respectively. The mass flow rate of the water is 720kg/h. Disregard the thermal resistance of the tube wall. The internal heat transfer coefficient is 1697W/m2⋅K. Take specific heat Cp of water as 4.179kJ/kg⋅K. The inner surface temperature at the exit section of the tube is ‌∘C (round off to one decimal place).

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