The prediction of temperature distribution near a nuclear HLW underground final disposal site

[[abstract]]An analytical analysis of buoyancy-induced convection in an infinite fluid-saturated porous media with a concentrated heat source is presented. This method can be used to model the thermal problems in underground disposal of high level radwaste (HLW). Perturbation analysis in the Rayleigh number, which is based on the heat generation rate, is used to determine the transient and steady-state temperature distributions and flow patterns around the source. In the perturbation analysis, only the leading terms in the series expansion are considered, which limits its validity to small Rayleigh numbers of less than 20. The solutions show that the region situated above the source is effectively heated by natural convection in addition to direct heat conduction from the source as the Rayleigh number increases. In addition, based on this solution, certain HLW disposal situations are examined to determine the extent of their thermal impact[[fileno]]2060121010019[[department]]工程與系統科學