Question: Water flows inside a smooth tube at a mean flow velocity of 3.0 m/s. The tube diameter is 25 mm and a constant heat flux

Water flows inside a smooth tube at a mean flow velocity of 3.0 m/s. The tube diameter is 25 mm and a constant heat flux condition is maintained at the tube wall such that the tube temperature is always 20oC above the water temperature. The water enters the tube at 30oC and leaves at 50oC. Calculate the tube length necessary to accomplish the indicated heating.

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