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A pin fin of uniform, cross-sectional area is fabricated of an aluminum alloy with a thermal...

A pin fin of uniform, cross-sectional area is fabricated of an aluminum alloy with a thermal conductivity of 160 W/m K. The fin diameter is 4mm, and the fin is exposed to convective conditions characterized by a convection coefficient of 220 W/m^2K. It is reported that the fin efficiency is 65 %. Determine the fin length and the fin effectiveness. Assume the fin length is very long compared to its diameter.

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