6. If an array of 4 mm thick copper annular fins with convective tip is attached to the pipe in Q 5. The external diamet

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6 If An Array Of 4 Mm Thick Copper Annular Fins With Convective Tip Is Attached To The Pipe In Q 5 The External Diamet 1 (87.79 KiB) Viewed 68 times

6. If an array of 4 mm thick copper annular fins with convective tip is attached to the pipe in Q 5. The external diameter of the fins noted as ra is 24 cm. (25 points) (1) Please find the efficiency of one annular fin with convective tip. You can find the properties of copper at 400 K, and Figure 3-20 attached in solving this question; (10 Points) 100 80 60 (%)' 1 = rzer 40 2 3 db 5 5 20 rze = r2 + 1/2 L = L + 1/2 A = Lt 0.5 1.0 1.5 2.0 2.5 2312(h/kA,)1/2 Figure 3.20 John Wiley & Sons, Inc. All rights reserved. (2) With known information provided in this question and assumed fin base temperature of 190°C, find the heat dissipated by one piece of the fins; (8 points) (3) With the heat transfer find in (2), find the effectiveness of this annular fin. You need assume the temperature of the pipe surface is 190 °C when calculating the heat loss by fin base when fin does not exist; (7 Points).