A 15-cm-diameter horizontal cylinder has a surface temperature that is maintained at 120C. Water at 40C is

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A 15-cm-diameter horizontal cylinder has a surface temperature that is maintained at 120°C. Water at 40°C is flowing across the cylinder with a velocity of 0.2 m/s. Determine the Nusselt number if the water is flowing

(a) Upward

(b) Downward.

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