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Unformatted text preview: 2. Air at 27ºC and 50 kPa enters a smooth tube 0.01 m in (inner) diameter and 0.5 m in length. The mean velocity is measured to be 3.0 m/s. A constant heat flux is imposed and the total heat flux to the tube is 5 W. The outside tube wall is thermally insulated from the atmosphere. (1) Calculate the exit bulk temperature of air. (2) Find the heat transfer coefficient at the exit. (3) Estimate the wall temperature at the exit. (ANSWERS: 63.3ºC; 12.0 W/m 2 K; 89.8ºC) 3. Water flows in a tube of 2 cm in diameter at an average flow velocity of 8 m/s. If the water enters at 20ºC and leaves at 30ºC and the tube length is 10 m, estimate the average wall temperature necessary to effect the required heat transfer. Also find the total heat transfer rate. (ANSWER: 32.2ºC)...
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- Spring '11
- Heat Transfer