A hot surface at 100°C is to be cooled by attaching 3-cm·long, 0.25-cm-diameter aluminum p...

A hot surface at 100°C is to be cooled by attaching 3-cm·long, 0.25-cm-diameter aluminum pin fins (k = 237 W/m·K) to it, with a center-to-center distance of 0.6 cm. The temperature of the surrounding medium is 30°C, and the heat transfer coefficient on the surfaces is 35 W/m2·K. Determine the rate of heat transfer from the surface for a 1-m × 1-m section of the plate. Also determine the overall effectiveness of the fins.

FIGURE P3-129