Consider a cubic block whose sides are 5 cm long and a cylindrical block whose height and...

Consider a cubic block whose sides are 5 cm long and a cylindrical block whose height and diameter are also 5 cm. Both blocks are initially at 20°C and are made of granite (k = 2.5 W/m·K and α = 1.15 × 10-6 m2 /s). Now both blocks are exposed to hot gases at 500°C in a furnace on all of their surfaces with a heat transfer coefficient of 40 W/m2 K. Determine the center temperature of each geometry after 10, 20. and 60 min.

FIGURE P 18-83