heat transfer A semi-infinite solid is initially at a temperature of 0°C. The surface is suddenly exposed to the environment at a temperature of 25°C and the surface convection coefficient is 11.2...

heat transfer

A semi-infinite solid is initially at a temperature of 0°C. The surface is suddenly exposed to the environment at a temperature of 25°C and the surface convection coefficient is 11.2 W/m2K. At what depth after 0.15 hours, the temperature of the solid drops to 2°C? (ksolid =0.87 W/mK, Okat -4.5 x 10-7 m2/hour). (Assume the biot number is greater than 0.1).