D223 The Effect of the Structure of Packed Bed on Boiling Phenomenon in Multiple Packed Bed

Boiling in packed bed is an important problem related to the geothermal system, the heat pipe, post accident analysis of liquid-cooled nuclear reactor debris and nuclear waste disposal. In this paper, the effect of structure of packed bed on boiling phenomenon in multiple packed beds filled with water has been investigated by numerical analysis. Two-dimensional boiling model in multiple packed beds has been proposed to obtain the distributions of water saturation, vapor pressure and temperature in multiple packed beds. In multiple packed bed composed of different particle beds, the water content becomes discontinuous at the interface because of the difference of the water characteristics between two layers. It was found that the water saturation and velocity of vapor strongly depend on the structure of multiple packed beds.