A circumferential fin of rectangular profile is constructed of stainless steel (18% Cr, 8% Ni). The thickness

Question:

A circumferential fin of rectangular profile is constructed of stainless steel (18% Cr, 8% Ni). The thickness of the fin is 2.0 mm, the inside radius is 2.0 cm, and the length is 8.0 cm. The base temperature is maintained at 135ºC and the fin is exposed to a convection environment at 15ºC with h = 20 W/m2 · ºC. Calculate the heat lost by the fin.