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A tube has an inner diameter of 6 cm. Air (1 atm) at an average velocity of 8 m/s enters the tube at 30oC and

A tube has an inner diameter of 6 cm. Air (1 atm) at an average velocity of 8 m/s enters the tube at 30oC and exits at mean temperature of 90oC. The surface of the tube is maintained at a constant temperature of 180oC. What is the length of the tube? Is the flow fully developed? Use properties of air from Table A-15 on page-964.

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