An annular aluminum fin (k = 237 W/m K) of rectangular profile is attached to a circular tube having an outside diameter of 25 mm and a surface

An annular aluminum fin (k = 237 W/m K) of rectangular profile is attached to a circular tube having an outside diameter of 25 mm and a surface temperature of 250 oC. The fin is 1 mm thick and 10 mm long, and the temperature and convection heat transfer coefficient associated with the adjoining fluid are 25 oC and 25 W/m2 oC, respectively. 1. Calculate the heat transfer rate from the fin. 2. If 200 such fins are spaced at 5 mm increments along the tube length, what is the total heat loss?