AUTO Problem 120 points) The end of a rectangular bar surrounded by insulation is maintained at 100 C and is exposed to ambient air as shown in the schematic. A linear array of pin fins (N -10) is affixed to the end surface to enhance the heat transfer rate from the bar. The pin fins (k = 65 W/m.K) are 3 mm in diameter and 12 mm long. The ambient air temperature is 25 C, and the convection coefficient over the bar end surface and pin fins is 10 W/mK. Determine: a) The effectiveness of a single fin b) The efficiency of a single fin d) Temperature of the tip of the fins H=9 mm W=63 mm c) The percentage increase in the heat transfer rate associated with attaching the fins to the bar end, AUTO Pro Fiv pi in