An annular stainless steel (k = 16.6 W/m * K) fin of thickness 5 mm and outside diameter 3 cm is attached to a 1-cm OD tube. The fin is surrounded by a fluid at 50 C with a heat-transfer coefficient of 40 W/m2 * K. The tube wall temperature is 150 C. Calculate:(a) The fin efficiency.(b) The rate of heat transfer from the fin. Ans. (a) 91%. (b) 6.4 W.

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