These experiments were made to evaluate the capsule heat flux in the radial direction and temperature gradients in the radiant direction. Temperature variations in this case are given in Figure 7. Figure 7. Temperature variation at capsule outer (1,3) and inner (2,4) surfaces during heating; 1, 2 are the surface temperature of a single capsule; 3, 4 are the temperature of capsule with shield The analyses of the data given in Figure 7 shows that shields cause the increase of the temperature gradient in the capsule in the radial direction. It was also observed that the melting process begins 2 to 3 minutes latter. The experiments with the heating of the capsule were also made when 1,2, 3, 4 or 5 lamps were switched on in succession. The results of the heating rate at 600 K are given in table 4. Table 4 Heating rates at 600K They testified to the assumption that, in the condition of our experiment, there exists additional input of the radiant flux from different lamps. The melting process went on in the capsule when 4 or 5 lamps were switched on. Temperature variation versus time on the outer and inner surfaces of the capsule at 5 switched on lamps is shown in Figure 7 (curve 1 and 2). The experiments were repeated with a capsule made of the same material as the aforementioned capsules but not hollow inside. The temperature variation in this case are given in Figure 8.
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