A steel cylinder of diameter 0.25 m and length 0.8 m initially at 25°C is placed in a furnace, where  = 1000°C. Determine the temperature at the centre and on the surface of the cylinder after a lapse...

A steel cylinder of diameter 0.25 m and length 0.8 m initially at 25°C is placed in a furnace, where
 = 1000°C. Determine the temperature at the centre and on the surface of the cylinder after a lapse of 1 h. Assume k,
, c_p
and h as in P.3.3.

P.3.3

A billet of steel of the form of a parallelepiped with dimensions 2 m
2 m
 5 m, originally at 300°C, is placed in a radiant furnace, where the furnace temperature is held at 1000°C. Deter mine the temperature at the centre after 30 minutes. For steel, take k = 35 W/m K,
 = 7800 kg/m³, c_p
= 0.83 kJ/kg K, while h = 233 W/m²
K.