A tube bank consists of 300 tubes at a distance of 6 cm between the centerlines of

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A tube bank consists of 300 tubes at a distance of 6 cm between the centerlines of any two adjacent tubes. Air approaches the tube bank in the normal direction at 20°C and 1 atm with a mean velocity of 6 m/s. There are 20 rows in the flow direction with 15 tubes in each row with an average surface temperature of 140°C. For an outer tube diameter of 2 cm, determine the average heat transfer coefficient. Evaluate the air properties at an assumed mean temperature of 70°C and 1 atm.

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