Development of numerical simulation method to evaluate heat transfer of fuel debris in air cooling, 4; Application of effective thermal conductivity models of porous medium

Uesawa, Shinichiro  ; Yamashita, Susumu   ; Shibata, Mitsuhiko ; Yoshida, Hiroyuki  

To evaluate the heat transfer of fuel debris in the primary containment vessel of the Fukushima Daiichi Nuclear Power Station, JAEA has developed a numerical simulation method with JUPITER. The previous work reported that JUPITER was appropriate for flow analysis of a porous medium. In this report, we report experimental and numerical results for natural convection in a system containing the porous medium to validate effective thermal conductivity models of the porous medium in JUPITER. The comparison result indicated that the use of a geometric mean model rather than a series model and a parallel model as an effective thermal conductivity model is appropriate for the natural convective heat transfer analysis in the systems containing the porous medium.