Question: An annulus consists of the region between two concentric tubes having diameters of 4 cm and 5 cm. Ethylene glycol flows in this space at

An annulus consists of the region between two concentric tubes having diameters of 4 cm and 5 cm. Ethylene glycol flows in this space at a velocity of 6.9 m/s. The entrance temperature is 20oC, and the exit temperature is 40oC. Only the inner tube is a heating surface, and it is maintained constant at 80oC. Calculate the length of annulus necessary to effect the heat transfer.

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