A plane wall surface at 200°C is to be cooled with aluminum pin lins of parabolic profile with bliuit tips. Each fin has a length of 25 mm and a base diameter of 4 mm. The lins arc exposed to an ambient air conditio» of 25°C and the heat transfer coefficient is 45 W/m2·K. If the thermal conductivity of the fins is 230 W/m·K, determine the heat transfer rate from a Single fin and the increase in the rate of heat transfer per nr surface area as a result of attaching fins. Assume there are 100 fins per m2 surface area.
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