Consider a horizontal 6-mm-thick, 100-mm-long straight fin fabricated from plain carbon steel (k = 57 W/m · K, s = 0.5). The base of the fin is maintained at 150°C, while the quiescent ambient air and the surroundings are at 25°C. Assume the fin tip is adiabatic.
Consider a sample of thickness L = 25 mm and a square planform of width W = 250 mm. In an experiment per- formed under steady-state conditions, temperature mea- surements made at the lower and upper surface of the sample yield values of T1 = 150°C and T2 = 100°C, respectively, for a power input of Pelec = 70 W. What are the thermal conductivity and emissivity of the sample?