Quiz 3 - 2-K Determine the outside surface temperature of...

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Wright State University Spring 2014 Department of Mechanical and Materials Engineering ME 3360/5360 HEAT TRANSFER: QUIZ 3 Open Book, Closed Notes, DO NOT Write on this Sheet Show All Work for Partial Credit Problem 1 (10 points): A cast iron pipe ( k = 52 W/m-K) is 8-m long, with an outside diameter of D o = 10 cm, and an inside diameter of D i = 9.2 cm. Steam flows inside the pipe at an average temperature of 200ºC with a heat transfer coefficient of 180 W/m 2 -K. The outer surface of the pipe is exposed to ambient air at 12ºC, with a heat transfer coefficient of 25 W/m
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Unformatted text preview: 2-K. Determine the outside surface temperature of the pipe and the heat transfer rate through the pipe wall. Neglect the effects of thermal radiation. (Answers: T o = 175.1ºC, ̇ ± ²³´µ¶ · ²´ ¸ W) Problem 2 (10 points): Two flanges are to be installed onto the pipe described in Problem 1 as shown below. Each flange is 1 cm thick, and is made of the same material as the pipe. Using the results found in Problem 1, determine the fin efficiency of the flanges and the rate of heat transfer from the flanges....
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