An annulus consists of the region between two concentric tubes having diameters of 4 cm and 5

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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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Heat Transfer

ISBN: 978-0073529363

10th edition

Authors: Jack Holman

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