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Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman
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Consider a thin-walled, metallic tube of length L 1 m and

Chapter , Problem 8.65

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QUESTION:

Consider a thin-walled, metallic tube of length L 1 m and inside diameter Di 3 mm. Water enters the tube at m 0.015 kg/s and Tm,i 97 C. (a) What is the outlet temperature of the water if the tube surface temperature is maintained at 27 C? (b) If a 0.5-mm-thick layer of insulation of k 0.05 W/m K is applied to the tube and its outer surface is maintained at 27 C, what is the outlet temperature of the water? (c) If the outer surface of the insulation is no longer maintained at 27 C but is allowed to exchange heat by free convection with ambient air at 27 C, what is the outlet temperature of the water? The free convection heat transfer coefficient is 5 W/m2 K. 8.6

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QUESTION:

Consider a thin-walled, metallic tube of length L 1 m and inside diameter Di 3 mm. Water enters the tube at m 0.015 kg/s and Tm,i 97 C. (a) What is the outlet temperature of the water if the tube surface temperature is maintained at 27 C? (b) If a 0.5-mm-thick layer of insulation of k 0.05 W/m K is applied to the tube and its outer surface is maintained at 27 C, what is the outlet temperature of the water? (c) If the outer surface of the insulation is no longer maintained at 27 C but is allowed to exchange heat by free convection with ambient air at 27 C, what is the outlet temperature of the water? The free convection heat transfer coefficient is 5 W/m2 K. 8.6

ANSWER:
kg/m3 and

(a) The outlet temperature of the water is 7

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