Air at atmospheric pressure flows across a staggered tube bank consisting of 8 rows of tubes in the flow direction. The tube diameter d = 1.0 cm, the longitudinal spacing and the transversal spacing of two consecutive cylin- ders are X₁ = 1.50 cm and X₁ = 2.54 cm. The upstream velocity U is 6 m/s and the upstream temperature Tỵ is 20°C. If the surface temperature of the tube is 180°C, find the average heat transfer coefficient for the tube bank.

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