From the start of heating to 1000 s, there is an increase in rate of temperature rise. The reradiation
loss which is proportional to the fourth power of cavity temperature, increases nonlinearly with
temperature and hence results in reduction of sensible heating of the insulation. This results in reduction
in the rate of rise of cavity temperature and hence after 1000 s, the temperature varies linearly with time.
Fig. 4 shows the temperature contour at the end of heating and dissociation stages. The temperature of the
inner cavity wall peaks at the center region and then falls of gradually which is due to the higher intensity