A rectangular fin of 30 cm length, 30 cm width,

and 2 mm thickness is attached to a surface at

3000C. The fin is made of aluminium (k = 204

W/mK) and is exposed to air at 300C. The fin

end is uninsulated and can lose heat through

its end also. The convection heat-transfer

coefficient between the fin surface and air is 15

W/m2K. Determine

(a) the temperature of the fin at 30 cm from

the base,

(b) the rate of heat transfer from the fin, and

(c) the fin efficiency.