To increase heat dissipation from a long tube with a 3.0-cm outer diameter, 12 longitudinal rectangular fins made of aluminum (k = 250 W/m K) are attached to the outer surface of the tube projecting radially outward with an even spacing. The fins are 0.1 cm thick and 2.0 cm long. The tube surface temperature is 100°C, and the ambient air temperature is 25°C. The convective heat transfer coefficient at the pipe and fin surfaces is h = 65 W/m² K. Determine:

(a) The rate of heat loss from the tube per m of tube length if no fins are present.

(b) The fin efficiency and the rate of heat dissipation per meter of tube length if the fins are installed.

(c) Repeat your calculation in

(b) if the fins are made of 316 _{stainless steel} instead of aluminum.