Problem

Aluminum square pin fins (k = 237 W/m•ºC) of 3-cm-long, 2 mm × 2 mm cross-section with a...

Aluminum square pin fins (k = 237 W/m•ºC) of 3-cm-long, 2 mm × 2 mm cross-section with a total number of 150 are attached to an 8-cm-long, 6-cm-wide surface. If the fin efficiency is 78 percent, the overall fin effectiveness for the surface is

(a) 3.4

(b) 4.2

(c) 5.5

(d) 6.7

(e) 8.4

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