Fractal model of solid-liquid two-phase thermal transport characteristics in the rough fracture network

Abstract

To discuss the influencing factors of thermal transport features in coarse fracture networks, the heat transfer analysis model of solid-liquid two-phase flow in a rough fracture network is created in this text. By calculating the thermal resistance and thermal conductivity of rough cracks, it was found that the thermal transport capacity of cracks is inversely proportional to relative roughness and porosity, and it is directly proportional to the ratio of solid-liquid thermal conductivity and Fractal dimension. Compared with other models and existing experimental data, it is concluded that the heat transfer capacity of dual media is stronger than that of the single porous medium. Finally, the percentage of thermal conductivity in the total thermal conductivity of the three parts was compared, and it was found that the strength of thermal transport mainly depends on the heat transfer ability of the matrix, because the solid thermal conductivity is much greater than the liquid thermal conductivity, so the thermal transport ability of the matrix is stronger than that of cracks and pores.