Heating Air by Condensing Steam. Air is flowing through a tube having an inside diameter of 38.1 mm at a velocity of 6.71 m/s, average temperature of 449.9K, and pressure of 138 kPa. The inside wall...

Extracted text: Heating Air by Condensing Steam. Air is flowing through a tube having an inside diameter of 38.1 mm at a velocity of 6.71 m/s, average temperature of 449.9K, and pressure of 138 kPa. The inside wall temperature is held constant at 204.4°C (477.6 K) by steam condensing outside the tube wall. Calculate the heat-transfer coefficient for a long tube and the heat-transfer flux. Ans. h 39.27 W/m? · K (6.91 btu/h · ft? · °F)