Consider a concentric tube annulus for which the inner and outer diameters are 25 and (50 mathrm{~mm}).
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Consider a concentric tube annulus for which the inner and outer diameters are 25 and \(50 \mathrm{~mm}\). Water enters the annular region at \(0.03 \mathrm{~kg} / \mathrm{s}\) and \(25^{\circ} \mathrm{C}\). If the inner tube wall is heated electrically at a rate (per unit length) of \(q^{\prime}=3000 \mathrm{~W} / \mathrm{m}\), while the outer tube wall is insulated, how long must the tubes be for the water to achieve an outlet temperature of \(85^{\circ} \mathrm{C}\) ? What is the inner tube surface temperature at the outlet, where fully developed conditions may be assumed?
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Fundamentals Of Heat And Mass Transfer
ISBN: 9781119220442
8th Edition
Authors: Theodore L. Bergman, Adrienne S. Lavine
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