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Unformatted text preview: an equation in Table 3.4.) (ANSWER: 26.8ºC) 3. A straight fin having a triangle profile has a length of 5 cm and a thickness of 4 mm and is constructed of a material having k = 23 W/m ºC. The fin is exposed to surroundings with a convection coefficient of 20 W/m 2 ºC and a temperature of 40ºC. The base of the fin is maintained at 200ºC. Calculate (1) the fin effectiveness, (2) the fin efficiency and (3) the heat lost from the fin per unit depth of fin. (ANSWER: 17.2; 220.0 W/m; 69%) 4. Consider a circumferential aluminum fin having a thickness of 1.0 mm to be installed on a 2.5-cm-diameter aluminum tube. The fin length is 1.25 cm. The convection environment is at 20ºC, and h = 125 W/m 2 ºC. Calculate the heat transfer for each fin for a tube wall temperature of 200 ºC. (ANSWER: 60.1 W)...
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- Spring '11
- Heat Transfer