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3. A cooling system uses 8 copper cylindrical fins of diameter 6 mm and length 100 mm to dissipate heat. The surface around the fins is maintained at 150 °C, and the tips of the fins are insulated. Air at 50 °C is used to cool the fins, flowing at 5 m/s. The flows around the fins do not affect each other. (a) Determine the average convection coefficient around each fin. (b) Calculate the overall heat dissipation rate of the fin system, assuming the fins are independent of each other. 4. Repeat problem 3, but use the bank-of-fins correlation presented in the textbook. The cylindrical fins are aligned, the spacings ST = 10 mm and SL = 10 mm. Assume NL, the number of tube rows, s 30. The outlet temperature is measured to be 80 °C

engineering   Mechanical-Engineering   
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