Consider a concentric tube annulus for which the innerand
Chapter 8, Problem 8.97(choose chapter or problem)
Consider a concentric tube annulus for which the innerand outer diameters are 25 and 50 mm. Water enters theannular region at 0.04 kg/s and 25C. If the inner tubewall is heated electrically at a rate (per unit length) ofq??4000 W/m, while the outer tube wall is insulated,how long must the tubes be for the water to achieve anoutlet temperature of 85C? What is the inner tube sur-face temperature at the outlet, where fully developedconditions may be assumed?
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